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Hortax compilation of references and links to literature, websites , genera and other plant groupings Page 1 In books, journals and online, a vast resource of literature and information has been amassed on subjects relating to cultivated plant nomenclature and taxonomy. This document references and links to these works, including an alphabetical index. Literature Bean, W.J. 1988. Trees and Shrubs Hardy in the British Isles. (8th ed.) Sir George Taylor, D.L. Clarke (eds). Supp. D.L. Clarke (ed.). London: John Murray. Beckett, K. (ed.). 1994. Alpine Garden Society Encyclopaedia of Alpines. Pershore, Worcs.: Alpine Garden Society. Brickell, C. (ed.). 2008. The Royal Horticultural Society A-Z Encyclopedia of Garden Plants. (3rd ed.) London: Dorling Kindersley. Brickell, C.D. et al (eds.). 2009. International Code of Nomenclature for Cultivated Plants (8th ed.). ISHS. Brummitt, R.K. (comp.). 1992. Vascular Plant Families and Genera. Kew: Royal Botanic Gardens. http://data.kew.org Cave, Y. & Paddison, V. 1999. The Gardener's Encyclopaedia of New Zealand Native Plants. Auckland: Godwit. Cooke, I. 1998. The Plantfinder's Guide to Tender Perennials. Newton Abbot, Devon: David & Charles. Grimshaw, J. & Bayton, R. 2009. New Trees. Recent Introductions to Cultivation. Kew: Royal Botanic Gardens. Hillier, J. & Coombes, A. (eds). 2002. The Hillier Manual of Trees & Shrubs. (7th ed.). Newton Abbot, Devon: David & Charles. Hirose, Y. & Yokoi, M. 1998 & 2001. Variegated Plants in Colour. Vols 1 & 2. Iwakuni, Japan: Varie Nine. Hoffman, M. (ed.). 2005. List of Woody Plants. International Standard ENA 2005-2010. Netherlands: Applied Plant Research. Huxley, A., Griffiths, M. & Levy, M. (eds). 1992. The New RHS Dictionary of Gardening. London: Macmillan.

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Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 1

In books, journals and online, a vast resource of literature and information has been amassed on

subjects relating to cultivated plant nomenclature and taxonomy. This document references and

links to these works, including an alphabetical index.

Literature

Bean, W.J. 1988.

Trees and Shrubs Hardy in the British Isles. (8th ed.) Sir George Taylor, D.L. Clarke (eds). Supp. D.L.

Clarke (ed.). London: John Murray.

Beckett, K. (ed.). 1994.

Alpine Garden Society Encyclopaedia of Alpines. Pershore, Worcs.: Alpine Garden Society.

Brickell, C. (ed.). 2008.

The Royal Horticultural Society A-Z Encyclopedia of Garden Plants. (3rd ed.) London: Dorling

Kindersley.

Brickell, C.D. et al (eds.). 2009.

International Code of Nomenclature for Cultivated Plants (8th ed.). ISHS.

Brummitt, R.K. (comp.). 1992.

Vascular Plant Families and Genera. Kew: Royal Botanic Gardens. http://data.kew.org

Cave, Y. & Paddison, V. 1999.

The Gardener's Encyclopaedia of New Zealand Native Plants. Auckland: Godwit.

Cooke, I. 1998.

The Plantfinder's Guide to Tender Perennials. Newton Abbot, Devon: David & Charles.

Grimshaw, J. & Bayton, R. 2009.

New Trees. Recent Introductions to Cultivation. Kew: Royal Botanic Gardens.

Hillier, J. & Coombes, A. (eds). 2002.

The Hillier Manual of Trees & Shrubs. (7th ed.). Newton Abbot, Devon: David & Charles.

Hirose, Y. & Yokoi, M. 1998 & 2001.

Variegated Plants in Colour. Vols 1 & 2. Iwakuni, Japan: Varie Nine.

Hoffman, M. (ed.). 2005.

List of Woody Plants. International Standard ENA 2005-2010. Netherlands: Applied Plant Research.

Huxley, A., Griffiths, M. & Levy, M. (eds). 1992.

The New RHS Dictionary of Gardening. London: Macmillan.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 2

Jelitto, L. & Schacht, W.R., Simon, H. 2002.

Die Freiland-Schmuckstauden. Germany: Verlag Eugen Ulmer.

Krüssmann, G. & Epp, M.E. (trans.). 1986.

Manual of Cultivated Broad-leaved Trees and Shrubs. London: Batsford (3 vols).

Leslie, A.C. (trans.). New Cultivars of Herbaceous Perennial Plants 1985-1990. Hardy Plant Society.

Mabberley, D.J. 2008.

Mabberley’s Plant Book. A Portable Dictionary of Plants, their Classification and Uses. (3rd ed.).

Cambridge: Cambridge University Press.

McNeill, J. et al. (eds). 2006.

International Code of Botanical Nomenclature (Vienna Code). Ruggell, Liechtenstein: A.R.G. Gantner

Verlag. Jan 2010. http://ibot.sav.sk.

Metcalf, L.J. 1987.

The Cultivation of New Zealand Trees and Shrubs. Auckland: Reed Methuen.

Nelson, E.C. 2000.

A Heritage of Beauty: The Garden Plants of Ireland: An Illustrated Encyclopaedia. Dublin: Irish Garden

Plant Society.

Rehder, A. 1940.

Manual of Cultivated Trees and Shrubs Hardy in North America. (2nd ed.). New York: Macmillan.

Rice, G. (ed.), 2006. Encyclopedia of Perennials. London: Dorling Kindersley.

Stearn, W.T. 1996. Stearn's Dictionary of Plant Names for Gardeners. London: Cassell.

Thomas, G.S. 1990. Perennial Garden Plants. A Modern Florilegium. (3rd ed.). London: Dent.

Trehane, P. (comp.). 1989. Index Hortensis. Vol. 1: Perennials. Wimborne: Quarterjack

Cullen, J. et al. (eds). 2011.

The European Garden Flora. Cambridge: Cambridge University Press. (5 vols).

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 3

Websites

Brand, H. UConn Plant Database of Trees, Shrubs and Vines Aug.2012.

Geves Database, agricultural, vegetable and fruit crops. Description of varieties on the French

National List

Canadian Ornamental Plant Foundation. Aug. 2012.

GRIN (Germplasm Resources Information Network) Taxonomy. Aug. 2012. http://www.ars-

grin.gov/npgs/gringlobal/docs/GRIN-Global_handout_April_2013.pdf

Hatch, D. Aug. 2012. New Ornamentals Society Database.

International Plant Names Index. Aug. 2012.

International Plant Names Index: Author Query. Aug. 2012.

Naktuinbouw (Netherlands Inspection Service for Horticulture), Variety descriptions for vegetables

agricultural crops and ornamentals.

National Institute of Agricultural Botany (NIAB) Botanical Descriptions of Varieties

Plant List, The. A working list of all plant species.

Seeds of diversity, Canada. The Canadian seed catalogue inventory, Canadian seed library, Classic

Canadian seed catalogues.

Swedish Programme for Diversity of Cultivated Plants.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 4

Genera and other plant groupings

A Acer

Gregory, P. & Angus, H. 2008.

World Checklist of Maple Cultivar Names. Forestry Commission National Arboreta.

Harris, J.G.S. 2000.

The Gardener's Guide to Growing Maples. Newton Abbot, Devon: David & Charles.

Van Gelderen, C.J. & Van Gelderen, D.M. 1999.

Maples for Gardens. A Color Encyclopedia. Portland, Oregon: Timber Press.

Vertrees, J.D. 2001.

Japanese Maples. Momiji and Kaede. (3rd ed.). Portland, Oregon: Timber Press.

Adiantum

Goudey, C.J. 1985. Maidenhair Ferns in Cultivation. Melbourne: Lothian.

Agapanthus

Snoeijer, W. 2004. Agapanthus. A Revision of the Genus. Portland, Oregon: Timber Press.

Agavaceae

Irish, M. & Irish, G. 2000.

Agaves, Yuccas and Related Plants. A Gardener's Guide. Portland, Oregon: Timber Press.

Aizoaceae

Burgoyne, P. et al. 1998.

Mesembs of the World. Illustrated Guide to a Remarkable Succulent Group. South Africa:

Briza Publications.

Allium

Davies, D. 1992. Alliums. The Ornamental Onions. London: Batsford

Androsace

Mitchell, B. 1999.

Celebrating the Bicentenary of David Douglas: a Review of Douglasia in Cultivation.

The New Plantsman 6(2):101-108.

Smith, G. & Lowe, D. 1997. The Genus Androsace. Pershore, Worcs.: Alpine Garden Society.

Anemone, Japanese

McKendrick, M. 1990. Autumn Flowering Anemones. The Plantsman 12(3):140-151.

McKendrick, M. 1998. Japanese Anemones. The Garden (RHS) 123(9):628-633.

Aquilegia

Munz, P.A. 1946. Aquilegia: the Cultivated and Wild Columbines. Gentes Herb. 7(1):1-150.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 5

Arecaceae (palms)

Craft, P. & Riffle, R.L. 2003. Encyclopedia of Cultivated Palms. Portland, Oregon: Timber Press.

Arisaema

Gusman, G. & Gusman, L. 2002. The Genus Arisaema: A Monograph for Botanists and Nature Lovers.

Ruggell, Leichtenstein: A.R. Gantner Verlag Kommanditgesellschaft.

Pradhan, U.C. 1997. Himalayan Cobra Lilies (Arisaema). Their Botany and Culture. (2nd ed.).

Kalimpong, West Bengal, India: Primulaceae Books.

Arum

Bown, D. 2000. Plants of the Arum Family. (2nd ed.). Portland, Oregon: Timber Press.

Asclepiadaceae

Eggli, U. (ed.). 2002.

Illustrated Handbook of Succulent Plants: Asclepiadaceae. Heidelberg, Germany: Springer-Verlag.

Aster

Picton, P. 1999. The Gardener's Guide to Growing Asters. Newton Abbot: David & Charles.

Asteraceae

Cubey, J. & Grant, M. 2004. Perennial Yellow Daisies: RHS Bulletin No 6. Wisley, Surrey: RHS.

Astilbe

Noblett, H. 2001.

Astilbe. A Guide to the Identification of Cultivars and Common Species. Cumbria: Henry Noblett.

B Bamboos

Ohrnberger, D. 1999. The Bamboos of the World. Amsterdam: Elsevier.

Begonia

Ingles, J. 1990.

American Begonia Society Listing of Begonia Cultivars. Revised Edition Buxton Checklist.

American Begonia Society.

Tebbitt, M.C. 2005.

Begonias: Cultivation, Identification and Natural History. Portland, Oregon: Timber Press.

American Begonia Society Astro Branch Begonia Data Base. Aug. 2012.

Berberidaceae

Stearn, W.T. & Shaw, J.M.H. 2002. The Genus Epimedium and Other Herbaceous

Berberidaceae including the Genus Podophyllum. Kew: Royal Botanic Gardens.

Betula

Ashburner, K.B. 1980. Betula - a Survey. The Plantsman 2(1):31-53.

Hunt, D. (ed.). 1993. Betula: Proceedings of the IDS Betula Symposium 1992. Richmond,

Surrey: International Dendrology Society.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 6

Boraginaceae

Bennett, M. 2003. Pulmonarias and the Borage Family. London: Batsford.

Bougainvillea

Gillis, W.T. 1976. Bougainvilleas of Cultivation (Nyctaginaceae). Baileya 20(1):34-41.

Iredell, J. 1990.

The Bougainvillea Grower's Handbook. Brookvale, Australia: Simon & Schuster.

Iredell, J. 1994. Growing Bougainvilleas. London: Cassell.

MacDaniels, L.H. 1981.

A Study of Cultivars in Bougainvillea (Nyctaginaceae). Baileya 21(2):77-100.

Singh, B., Panwar, R.S., Voleti, S.R., Sharma, V.K. & Thakur, S. 1999. The New International

Bougainvillea Check List. (2nd ed.). New Delhi: Indian Agricultural Research Institute.

Bromeliaceae

Beadle, D.A. 1991. A Preliminary Listing of all the Known Cultivar and Grex Names for the

Bromeliaceae. Corpus Christi, Texas: Bromeliad Society.

Brugmansia

Wreggitt, L. et al. (comp.). Aug.2012.

Brugmansia Growers International List of Known Brugmansia Names.

Buddleja

Stuart, D.D. 2006.

Buddlejas: Royal Horticultural Society Plant Collector Guide. Portland, Oregon: Timber Press.

Bulbs

Leeds, R. 2000. The Plantfinder's Guide to Early Bulbs. Newton Abbot, Devon: David & Charles.

Buxus

Batdorf, L.R. 1995. Boxwood Handbook. A Practical Guide to Knowing and Growing Boxwood.

Boyce, VA, USA: The American Boxwood Society. Aug. 2012.

C Cactaceae

Hunt, D. et al. 2006. New Cactus Lexicon. (2 vols.) Sherborne, Dorset: DH Books.

Camellia

Trujillo, D. J. (ed.). 2002.

Camellia Nomenclature. (24th revd ed.). Southern California Camellia Society.

Savige, T.J. (comp.). 1993.

The International Camellia Register. (Vol 1-2). Supp. 1997. The International Camellia Society.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 7

Campanula

Lewis, P. & Lynch, M. 1998. Campanulas. A Gardeners Guide. (2nd ed.). London: Batsford.

Lewis, P 2002. Campanulas in the Garden. Pershore, Worcs.: Hardy Plant Society.

Campanulaceae

Lammers, T.G. 2007. World Checklist and Bibliography of Campanulaceae. Kew Publishing.

Canna

Cooke, I. 2001.The Gardener's Guide to Growing Cannas. Newton Abbot, Devon: David & Charles.

Gray, J. & Grant, M. 2003. Canna: RHS Bulletin No 3. Wisley, Surrey: RHS.

Carnivorous Plants

Schlauer, J. (comp.). Aug. 2012. Carnivorous Plant Database.

Ceanothus

Fross, D. & D. Wilken. 2006. Ceanothus. Portland, Oregon: Timber Press.

Cercidiphyllum

Dosmann, M.S. 1999.

Katsura: a Review of Cercidiphyllum in Cultivation and in the Wild. The New Plantsman 6(1):52-62.

Dosmann, M., Andrews, S., Del Tredici, P. & Li, J. 2003.

Classification and Nomenclature of Weeping Katsuras. The Plantsman 2(1):21-27.

Chaenomeles

Weber, C. 1963. Cultivars in the Genus Chaenomeles. Arnoldia (Jamaica Plain) 23(3):17-75.

Chrysanthemum

Brummitt, D. 1997. Chrysanthemum Once Again. The Garden (RHS) 122(9):662-663.

Gosling, S.G. (ed.). 1964.

British National Register of Chrysanthemums. Whetstone, London: National Chrysanthemum Society.

National Chrysanthemum Society. 2000. British National Register of Names of Chrysanthemums

Amalgamated Edition 1964-1999. Tamworth, Staffordshire: National Chrysanthemum Society.

National Chrysanthemum Society Aug. 2012. Bloom identification.

Cistus

Page, R.G. Aug.2012. Cistus and Halimium Website.

Citrus

Page, M. 2008. Growing Citrus. London: Timber Press

Saunt, J. 1990. Citrus Varieties of the World. An Illustrated Guide. Norwich: Sinclair

Clematis

Grey-Wilson, C. 2000. Clematis: the Genus. London: Batsford

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 8

Johnson, M. 2001. The Genus Clematis. Södertälje, Sweden: Magnus Johnsons Plantskola AB & Bengt Sundström. Matthews, V. (comp.). 2002. The International Clematis Register and Checklist 2002 & Supps 1-3. 2004-2009. London: RHS.

Toomey, M. & Leeds, E. 2001.

An Illustrated Encyclopedia of Clematis. Portland, Oregon: Timber Press.

Clematis on the Web. Aug. 2012.

HelpMeFind Clematis. Aug. 2012.

Conifers

den Ouden, P. & Boom, B.K. 1965. Manual of Cultivated Conifers. The Hague: Martinus Nijhof.

Eckenwalder, J.E. 2009. Conifers of the World. China:Timber Press

Knees, S.G. & Springate, L.S. 2009. The International Conifer Register, Pt 5. London: RHS.

Krüssmann, G. & Epp, M.E. (trans.). 1985. Manual of Cultivated Conifers. London: Batsford.

Lewis, J. & Leslie, A.C. 1987-1998. The International Conifer Register. Pts 1-4. London: RHS.

Welch, H.J. 1979. Manual of Dwarf Conifers. New York: Theophrastus.

Welch, H.J. 1991.

The Conifer Manual. Vol. 1. Dordrecht, Netherlands: Kluwer Academic Publishers.

Welch, H.J. 1993.

The World Checklist of Conifers. Bromyard, Herefordshire: Landsman's Bookshops Ltd.

Cornus

Cappiello, P. & Shadow, D. 2005. Dogwoods. Portland, Oregon: Timber Press.

Howard, R.A. 1961.

Registration Lists of Cultivar Names in Cornus L. Arnoldia (Jamaica Plain) 21(2):9-18.

Corydalis

Lidén, M. & Zetterlund, H. 1997.Corydalis. A Gardener's Guide and a Monograph of the

Tuberous Species. Pershore, Worcs.: Alpine Garden Society Publications Ltd.

Cotoneaster

Fryer, J. & Hylmö, B. 2001. Captivating Cotoneasters. The New Plantsman 8(4):227-238.

Fryer, J. & Hylmö, B. 2009. Cotoneasters. A Comprehensive Guide to Shrubs for Flowers,

Fruit and Foliage. Portland, Oregon: Timber Press.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 9

Crassulaceae

Rowley, G. 2003. Crassula: A Grower’s Guide. Venegono superiore, Italy: Cactus & Co.

Eggli, U. (ed.) 2003. Illustrated Handbook of Succulent Plants. Springer.

Crocosmia

Goldblatt, P., Manning, J.C. & Dunlop, G. 2004.

Crocosmia and Chasmanthe. Portland, Oregon: Timber Press.

Crocus

Jacobsen, N., van Scheepen, J. & Ørgaard, M. 1997.

The Crocus chrysanthus - biflorus Cultivars. The New Plantsman 4(1):6-38.

Mathew, B. 1982. The Crocus. A Review of the Genus Crocus (Iridaceae). London: Batsford.

Cyclamen

Clennett, C. Jan. 2003. Register of Cultivar Names. www.cyclamen.org

Grey-Wilson, C. 2003.

Cyclamen. A Guide for Gardeners, Horticulturists & Botanists. London: Batsford.

D Dahlia

National Dahlia Society. 2012.

Classified Directory and Judging Rules. (31st ed.) Aldershot, Hants: National Dahlia Society.

RHS & Hedge, R. (comps). 1969. Tentative Classified List and International Register of

Dahlia Names 1969 & Supps 1-13. Supps 13-21. 2002-11. London: RHS.

American Dahlia Society website. Aug. 2012.

Winchester Growers Ltd English National Dahlia Collection website. Aug. 2012.

Daphne

Brickell, C.D. & Mathew, B. 1976.

Daphne. The Genus in the Wild and in Cultivation. Woking, Surrey: Alpine Garden Society.

Grey-Wilson, C. (ed.). 2001. The Smaller Daphnes. The Proceedings of 'Daphne 2000',

a Conference held at the Royal Horticultural Society. Pershore, Worcs.: Alpine Garden Society.

White, R. 2006. Daphnes: A Practical Guide for Gardeners. Portland, Oregon: Timber Press.

Delphinium

1949. A Tentative Check-list of Delphinium Names. London: RHS.

1970. A Tentative Check-list of Delphinium Names. Addendum. London: RHS.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 10

Bassett, D. & Wesley, W. 2004. Delphinium: RHS Bulletin No 5. Wisley, Surrey: RHS.

Leslie, A.C. 1996. The International Delphinium Register Cumulative Supp. 1970-1995. London: RHS.

Leslie, A.C. 1996-2005. The International Delphinium Register Supp. 1994-99. The Delphinium

Society Year Book 1996-2005. London: RHS.

Dianthus

Galbally, J. & Galbally, E. 1997.

Carnations and Pinks for Garden and Greenhouse. Portland, Oregon: Timber Press.

Leslie, A.C. The International Dianthus Register. 1983-2002.

(2nd ed. & Supps 1-19). Supps 19-27, 2002-11. London: RHS

Dionysia

Grey-Wilson, C. 1989. The Genus Dionysia. Woking, Surrey: Alpine Garden Society.

Douglasia see under Androsace

Dracaena

Bos, J.J., Graven, P., Hetterscheid, W.L.A. & van de Wege, J.J. 1992.

Wild and cultivated Dracaena fragrans. Edinburgh J. Bot. 49(3):311-331.

E Echeveria

Schulz, L. & Kapitany, A. Echeveria Cultivars. Teesdale, Australia: Schulz Publishing.

Episcia

Dates, J.D. 1993.

The Gesneriad Register 1993. Check List of Names with Descriptions of Cultivated Plants in the

Genera Episcia & Alsobia.Galesburg, Illinois: American Gloxinia & Gesneriad Society, Inc.

Erodium

Toomey, N., Cubey, J. & Culham, A. 2002. Erodium × variabile. The Plantsman 1(3): 166-172

Victor, D.X. (comp.). 2000. Erodium: Register of Cultivar Names. The Geraniaceae Group.

Erythronium

Mathew, B. 1992.

A Taxonomic and Horticultural Review of Erythronium L. (Liliaceae). J. Linn. Soc., Bot. 109:453-471.

Mathew, B. 1998. The Genus Erythronium. Bull. Alpine Gard. Soc. Gr. Brit. 66(3):308-321.

Eupatorium sensu lato

Hind, D.J.N. 2006. Splitting Eupatorium. The Plantsman (n.s.) 5(2):185-189.

Euonymus

Brown, N. 1996. Notes on Cultivated Species of Euonymus. The New Plantsman 3(4):238-243.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 11

Lancaster, C.R. 1981.

An Account of Euonymus in Cultivation and its Availability in Commerce. The Plantsman 3(3):133-166.

Lancaster, C.R. 1982. Euonymus in Cultivation - Addendum. The Plantsman 4:61-64, 253-254.

Euphorbia

Turner, R. 1995. Euphorbias. A Gardeners Guide. London: Batsford.

Witton, D. 2000. Euphorbias. Pershore, Worcs.: Hardy Plant Society.

F Fagus

Dönig, G. 1994. Die Park-und Gartenformen der Rotbuche Fagus sylvatica L. Erlangen, Germany:

Verlag Gartenbild Heinz Hansmann.

Wyman, D. 1964. Registration List of Cultivar Names of Fagus L. J. Arnold Arbor. 24(1):1-8.

Ferns

Jones, D.L. 1987. Encyclopaedia of Ferns. Melbourne, Australia: Lothian.

Kaye, R. 1968. Hardy Ferns. London: Faber & Faber

Rickard, M.H. 2000.

The Plantfinder's Guide to Garden Ferns. Newton Abbot, Devon: David & Charles.

Rush, R. 1984. A Guide to Hardy Ferns. London: British Pteridological Society.

Forsythia

INRA Forsythia website. Aug. 2012

Fritillaria

Clark, T. & Grey-Wilson, C. 2003. Crown Imperials. The Plantsman 2(1):33-47.

Mathew, B., et al. 2000. Fritillaria Issue. Bot. Mag. 17(3):145-185.

Pratt, K. & Jefferson-Brown, M. 1997.

The Gardener's Guide to Growing Fritillaries. Newton Abbot: David & Charles.

Turrill, W.B. & Sealy, J.R. 1980.

Studies in the Genus Fritillaria (Liliaceae). Hooker's Icones Plantarum Vol. 39 (1 & 2).

Kew: Royal Botanic Gardens.

Fruit

Bowling, B.L. 2000.The Berry Grower's Companion. Portland, Oregon: Timber Press.

Hogg, R. 1884. The Fruit Manual. (5th ed.). London: Journal of Horticulture Office.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 12

Brogdale Horticultural Trust National Fruit Collection. Aug. 2012.

Fuchsia

Bartlett, G. 1996. Fuchsias - A Colour Guide. Marlborough, Wilts: Crowood Press.

Boullemier, Leo.B. (comp.). 1991. The Checklist of Species, Hybrids and Cultivars of the Genus

Fuchsia. London, New York, Sydney: Blandford Press.

Boullemier, Leo.B. (comp.). 1995. Addendum No 1 to the 1991 Checklist of Species, Hybrids and

Cultivars of the Genus Fuchsia. Dyfed, Wales: The British Fuchsia Society.

Goulding, E. 1995. Fuchsias: The Complete Guide. London: Batsford.

Johns, E.A. 1997. Fuchsias of the 19th and Early 20th Century. An Historical Checklist of Fuchsia

Species & Cultivars, pre-1939. Kidderminster, Worcs.: British Fuchsia Society

Jones, L. & Miller, D.M. 2005. Hardy Fuchsias: RHS Bulletin No 12. Wisley, Surrey: RHS.

American Fuchsia Society Registration Database. Aug. 2012.

Stevens, R. Aug. 2012. Find That Fuchsia.

G Galanthus

Bishop, M., Davis, A. & Grimshaw, J. 2001.

Snowdrops. A monograph of cultivated Galanthus. Maidenhead: Griffin Press.

Gentiana

Bartlett, M. 1975. Gentians. Dorset: Blandford Press.

Geranium

Armitage, J.D. 2005-2007.

Hardy Geraniums – Stages 1-3: RHS Bulletin Nos 10 , 14 & 18. Wisley, Surrey: RHS.

Bath, T. & Jones, J. 1994.

The Gardener's Guide to Growing Hardy Geraniums. Newton Abbot, Devon: David & Charles.

Bendtsen, B.H. 2005. Gardening with Hardy Geraniums. Portland, Oregon: Timber Press.

Jones, J., et al. 2001.

Hardy Geraniums for the Garden. (3rd ed.). Pershore, Worcs.: Hardy Plant Society.

Victor, D.X. 2004. Register of Geranium Cultivar Names. (2nd ed.). The Geraniaceae Group.

Yeo, P.F. 2002. Hardy Geraniums. (3rd ed.). Kent: Croom Helm.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 13

Gesneriaceae

The Gesneriad Society. Listing of registered gesneriads. Jan 2010

Dates, J.D. 1986-1990. The Gesneriad Register 1986-1987 & 1990. Galesburg, Illinois:

American Gloxinia & Gesneriad Society, Inc.

Gladiolus

British Gladiolus Society List of Cultivars Classified for Show Purposes 1994.

Mayfield, Derbyshire: British Gladiolus Society.

1997-1998.

British Gladiolus Society List of European, New Zealand & North American Cultivars Classified for

Exhibition Purposes 1997 & 1998. Mayfield, Derbyshire: British Gladiolus Society.

Gleditsia

Santamour, F.S. & McArdle, A.J. 1983.

Checklist of Cultivars of Honeylocust (Gleditsia triacanthos L.). J. Arboric. 9:271-276.

Grevillea

Olde, P. & Marriott, N. 1995. The Grevillea Book. (3). Kenthurst, NSW: Kangaroo Press.

H Hamamelis

Lane, C. 2005. Witch Hazels. Portland, Oregon: Timber Press.

Hebe

Chalk, D. 1988. Hebes and Parahebes. Bromley, Kent: Christopher Helm (Publishers) Ltd.

Hutchins, G. 1997.

Hebes: Here and There. A Monograph on the Genus Hebe. Caversham, Berks: Hutchins & Davies.

Metcalf, L.J. 2001.International Register of Hebe Cultivars. Canterbury, New Zealand: Royal New

Zealand Institute of Horticulture (Inc.).

Metcalf, L.J. 2006.

Hebes: A Guide to Species, Hybrids and Allied Genera. Portland, Oregon: Timber Press.

Hedera

McAllister, H. 1988. Canary and Algerian Ivies. The Plantsman 10(1):27-29.

Rose, P.Q. 1996. The Gardener's Guide to Growing Ivies. Newton Abbot, Devon: David & Charles.

Heliconia

Berry, F. & Kress, W.J. 1991.

Heliconia. An Identification Guide. Washington: Smithsonian Institution Press.

Helleborus

Burrell, C.C. & Tyler, J.K. 2006. Hellebores: A Comprehensive Guide. Portland, Oregon: Timber Press.

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Page 14

Mathew, B. 1989. Hellebores. Woking: Alpine Garden Society.

Rice, G. & Strangman, E. 1993.

The Gardener's Guide to Growing Hellebores. Newton Abbot, Devon: David & Charles.

Hemerocallis

Baxter, G.J. (comp.). American Daylily Society Registry of Daylily Cultivars. Aug. 2012.

Heuchera and X Heucherella

Heims, D. & Ware, G. 2005.

Heucheras and Heucherellas: Coral Bells and Foamy Bells. Portland, Oregon: Timber Press.

Hosta

Grenfell, D. & Shadrack, M. 2004.The Color Encyclopedia of Hostas. Portland, Oregon: Timber Press.

Grenfell, D. & Shadrack, M. 2009. The New Encyclopedia of Hostas. Portland, Oregon: Timber Press.

Schmid, W.G. 1991. The Genus Hosta. London: Batsford.

Hosta Library. Aug 2012

Hyacinthaceae pro parte (Asparagacaea)

Dashwood, M. & Mathew, B. 2006.

Hyacinthaceae - little blue bulbs: RHS Bulletin No 11. Wisley, Surrey: RHS.

Mathew, B. 2005. Hardy Hyacinthaceae Pt 1: Muscari. The Plantsman 4(1):40-53.

Mathew, B. 2005.

Hardy Hyacinthaceae Pt 2: Scilla, Chionodoxa and × Chinoscilla. The Plantsman 4(2):110-121.

Hyacinthus and miscellaneous bulbs

Scheepen, J. van (1991)

International Checklist for Hyacinths and Miscellaneous Bulbs

Hydrangea

Dirr, M.A. 2004. Hydrangeas for American Gardens. Portland, Oregon: Timber Press.

Haworth-Booth, M. 1975. The Hydrangeas. London: Garden Book Club.

Van Gelderen, C.J. & Van Gelderen, D.M. 2004.

Encyclopedia of Hydrangeas. Portland, Oregon: Timber Press.

Hypericum

Lancaster, R. & Robson, N. 1997.

Focus on Plants: Bowls of Beauty. The Garden (RHS) 122(8):566-571.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 15

I Ilex

Bailes, C. 2006. Hollies for Gardeners. Portland, Oregon: Timber Press.

Dudley, T.R. & Eisenbeiss, G.K. 1973 & 1992. International Checklist of Cultivated Ilex, Pts 1 & 2..

Washington DC: United States Dept of Agriculture.

Galle, F.C. 1997. Hollies: the Genus Ilex. Portland, Oregon: Timber Press.

Impatiens

Morgan, R.J. 2007. Impatiens: The Vibrant World of Busy Lizzies, Balsams and Touch-me-nots.

Portland, Oregon: Timber Press.

Iris

Austin, C. 2005. Irises: A Gardener’s Encyclopedia. Oregon:Timber Press.

Keppel, K. (ed.) 2001.

Iris Check List of Registered Cultivar Names 1990-1999. Hannibal, New York: the American Iris Society.

Mathew, B. 1981. The Iris. London: Batsford.

Stebbings, G. 1997. The Gardener's Guide to Growing Iris. Newton Abbot: David & Charles.

The Species Group of the British Iris Society, (ed.). 1997.

A Guide to Species Irises. Their Identification and Cultivation. Cambridge: Cambridge University Press.

J Jovibarba see under Sempervivum

K Kalmia

Jaynes, R.A. 1997. Kalmia. Mountain Laurel and Related Species. Portland, Oregon: Timber Press.

Kniphofia

Taylor, J. 1985. Kniphofia - a Survey. The Plantsman 7(3):129-160.

Kohleria

Dates, J.D. (ed.) & Batcheller, F.N. (comp.). 1985.

The Gesneriad Register 1985. Check List of Names with Descriptions of Cultivated Plants in the

Genus Kohleria. Lincoln Acres, California: American Gloxinia and Gesneriad Society, Inc.

L Lachenalia

Duncan, G.D. 1988.

The Lachenalia Hand Book. Kirstenbosch, South Africa: National Botanic Gardens.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 16

Lantana

Howard, R.A. 1969.

A Check List of Cultivar Names Used in the Genus Lantana. Arnoldia. 29(11):73-109.

Lathyrus

Norton, S. 1996.Lathyrus. Cousins of Sweet Pea. Surrey: NCCPG.

Lavandula

Upson, T. & Andrews, S. 2004. The Genus Lavandula. Kew: Royal Botanic Garden.

Legumes

ILDIS. International Legume Database and Information Service. Aug. 2012.

Leptospermum

Check List of Leptospermum Cultivars. 1963. J. Roy. New Zealand Inst. Hort. 5(5):224-30.

Dawson, M. 1997. A History of Leptospermum scoparium in Cultivation - Garden Selections.

The New Plantsman 4(2):67-78.

Lewisia

Davidson, B.L.R. 2000. Lewisias. Portland, Oregon: Timber Press.

Elliott, R. 1978. Lewisias. Woking: Alpine Garden Society.

Mathew, B. 1989. The Genus Lewisia. Bromley, Kent: Christopher Helm.

Lilium

Matthews, V.

The International Lily Register & Checklist 2007. Supps 1-2, 2008-2012. London: RHS.

Lonicera

Blahník, Z. 2006. Lonicera Cultivar Names: The First World List. Acta Pruhoniciana 81:59-64.

M Magnolia

Callaway, D.J. Aug. 2012. Magnolia Cultivar Checklist.

Malus

Crawford, M. 1994. Directory of Apple Cultivars. Devon: Agroforestry Research Trust.

Fiala, J.L. 1994. Flowering Crabapples. The genus Malus. Portland, Oregon: Timber Press.

Rouèche, A. Oct 2007. Les Crets Fruits et Pomologie.

Meconopsis

Grey-Wilson, C. 1992. A Survey of the Genus Meconopsis in Cultivation. The Plantsman 14(1): 1-33.

Grey-Wilson, C. 2002. The True Identity of Meconopsis napaulensis. Bot. Mag. 23(2):176-209.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 17

Stevens, E. & Brickell, C. 2001.

Problems with the Big Perennial Poppies. The New Plantsman 8(1):48-61.

Stevens, E. 2001.

Further Observations on the Big Perennial Blue Poppies. The New Plantsman 8(2):105-111.

Meconopsis Group website. Aug. 2012.

Miscanthus

Jones, L. 2004. Miscanthus: RHS Bulletin No 7. Wisley, Surrey: RHS.

Musa

Banana and Plantain Section of Biodiversity International. Aug. 2012.

INIBAP Musa Germplasm Information System. Aug. 2012.

N Narcissus

Kington, S. (comp.). 2008. The International Daffodil Register and Classified List 2008

(4th ed. & Supps 1-4. 2008-2011. London: RHS.

Nematanthus

Arnold, P. 1978. The Gesneriad Register 1978. Check List of Nematanthus. American Gloxinia

and Gesneriad Society, Inc.

Nerium

Pagen, F.J.J. 1987. Oleanders. Nerium L. and the Oleander Cultivars. Wageningen, The Netherlands:

Agricultural University Wageningen.

Nymphaea

Knotts, K. & Knotts, B. Victoria Adventure Website. Checklist of Waterlily Cultivars. Aug. 2012.

O Origanum

White, S. 1998. Origanum. The Herb Marjoram and its Relatives. Surrey: NCCPG.

P Paeonia

Jakubowski, R. 2008. Peonies 1997-2007. Registered Peony Cultivars, with a Checklist of

Peony Names, References and Originators. Missouri: American Peony Society.

Osti, G.L. 1999. The Book of Tree Peonies. Turin: Umberto Allemandi.

Wang, L., et al. 1998.Chinese Tree Peony. Beijing: China Forestry Publishing House.

HelpMeFind Peonies. Aug. 2012.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 18

Papaver

Grey-Wilson, C. 1998. Oriental Glories. The Garden (RHS) 123(5):320-325.

Papaveraceae

Grey-Wilson, C. 2000. Poppies. The Poppy Family in the Wild and in Cultivation. London: Batsford.

Tebbitt, M. Liden, M. Zetterlund, H. 2008.

Bleeding Hearts, Corydalis and their Relatives. Portland, Oregon: Timber Press

Passiflora

Irvine, M. Aug. 2012. Passiflora online.

Pelargonium

Abbott, P.G. 1994. A Guide to Scented Geraniaceae. Angmering, West Sussex: Hill Publicity Services.

Anon. 1978 & 1985.

A Checklist and Register of Pelargonium Cultivar Names. Pts 1 & 2. Australian Pelargonium Society.

Bagust, H. 1988. Miniature and Dwarf Geraniums. London: Christopher Helm.

Key, H. 2000. 1001 Pelargoniums. London: Batsford.

Miller, D. 1996.

Pelargonium. A Gardener's Guide to the Species and Cultivars and Hybrids. London: Batsford.

Penstemon

Lindgren, D.T. & Davenport, B. 1992.

List and description of named cultivars in the genus Penstemon. University of Nebraska.

Nold, R. 1999. Penstemons. Portland, Oregon: Timber Press.

Way, D. & James, P. 1998.

The Gardener's Guide to Growing Penstemons. Newton Abbott, Devon: David & Charles.

Way, D. 2006. Penstemons. Pershore, Worcs.: Hardy Plant Society.

Phlomis

Mann Taylor, J. 1998. Phlomis: The Neglected Genus. Wisley: NCCPG.

Phlox

Harmer, J. & Elliott, J. 2001. Phlox. Pershore, Worcs.: Hardy Plant Society.

Stebbings, G. 1999. Simply Charming. The Garden (RHS) 124(7):518-521.

Wherry, E.T. 1955. The Genus Phlox. Philadelphia, Pennsylvania: Morris Arboretum.

Phormium

Heenan, P.B. 1991.Checklist of Phormium Cultivars. Royal New Zealand Institute of Horticulture.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 19

McBride-Whitehead, V. 1998. Phormiums of the Future. The Garden (RHS) 123(1):42-45.

Pieris

Bond, J. 1982. Pieris - a Survey. The Plantsman 4(2):65-75.

Wagenknecht, B.L. 1961. Registration Lists of Cultivar Names in the Genus Pieris D. Don.

Arnoldia (Jamaica Plain) 21(8):47-50.

Pittosporum

Miller, D.M. 2006. RHS Plant Assessments: Pittosporum tenuifolium hybrids & cultivars.

Plectranthus

Addink, Wouter. Jan 2010. Coleus Finder.

Miller, D. & Morgan, N. 2000. Focus on Plants: A New Leaf. The Garden (RHS) 125(11):842-845.

Shaw, J.M.H. 1999.Notes on the Identity of Swedish Ivy and Other Cultivated Plectranthus.

The New Plantsman 6(2):71-74.

Pleione

Cribb, P. & Butterfield, I. 1999. The Genus Pleione. (2nd ed.). Kew: Royal Botanic Gardens.

Shaw, J.M.H. (comp.). Oct 2002. Provisional List of Pleione Cultivars. RHS.

Poaceae (grasses)

Darke, R. 2007.Encyclopedia of Grasses for Livable Landscapes. Portland, Oregon: Timber Press.

Grounds, R. 1998.

The Plantfinder's Guide to Ornamental Grasses. Newton Abott, Devon: David & Charles.

Wood, T. 2002. Garden Grasses, Rushes and Sedges. (3rd ed.). Abingdon, Oxon: John Wood.

Polemonium

Nichol-Brown, D. 2000. Polemonium. Wisley: NCCPG.

Corydalis

Lidén, M. & Zetterlund, H. 1997.Corydalis. A Gardener's Guide and a Monograph of the Tuberous

Species. Pershore, Worcs.: Alpine Garden Society Publications Ltd.

Potentilla

Davidson, C.G., Enns, R.J. & Gobin, S. 1994.A Checklist of Potentilla fruticosa: the Shrubby

Potentillas. Morden, Manitoba: Agriculture & Agri-Food Canada Research Centre.

Miller, D.M. 2002. Shrubby Potentilla: RHS Bulletin No 1. Wisley, Surrey: RHS.

Primula allionii

Archdale, B. & Richards, D. 1997.

Primula allionii Forms and Hybrids. National Auricula & Primula Society, Midland & West Section.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 20

Primula auricula

Baker, G. Double Auriculas. National Auricula & Primula Society, Midland & West Section.

Baker, G. & Ward, P. 1995. Auriculas. London: Batsford.

Guest, A. 2009.

The Auricula History, Cultivation and Varieties. Woodbridge, Suffolk: Garden Art Press

Hawkes, A. 1995. Striped Auriculas. National Auricula & Primula Society, Midland & West Section.

Nicholle, G. 1996. Border Auriculas. National Auricula & Primula Society, Midland & West Section.

Robinson, M.A. 2000. Auriculas for Everyone. How to Grow and Show Perfect Plants. Lewes, Sussex:

Guild of Master Craftsmen Publications.

Telford, D. 1993. Alpine Auriculas. National Auricula & Primula Society, Midland & West Section.

Ward, P. 1991. Show Auriculas. National Auricula & Primula Society, Midland & West Section.

Proteaceae

International Proteaceae Register. July 2002. (7th ed.).

Prunus

Crawford, M. 1996. Plums. Dartington, Devon: Agroforestry Research Trust.

Jacobsen, A.L. 1992. Purpleleaf Plums. Portland, Oregon: Timber Press.

Jefferson, R.M. & Wain, K.K. 1984.The Nomenclature of Cultivated Flowering Cherries (Prunus).

The Sato-Zakura Group. Washington DC: USDA.

Kuitert, W. 1999. Japanese Flowering Cherries. Portland, Oregon: Timber Press.

Pulmonaria

Bennett, M. 2003. Pulmonarias and the borage family. London: B.T. Batsford.

Hewitt, J. 1994. Pulmonarias. Pershore, Worcs.: Hardy Plant Society.

Hewitt, J. 1999. Well Spotted. The Garden (RHS) 124(2):98-103.

Pyracantha

Egolf, D.R. & Andrick, A.O. 1995.

A Checklist of Pyracantha Cultivars. Washington DC: Agricultural Research Service.

Pyrus

Crawford, M. 1996.Directory of Pear Cultivars. Totnes, Devon: Agroforestry Research Institute.

Smith, M.W.G. 1976. Catalogue of the British Pear. Faversham, Kent: MAFF.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 21

Q Quercus

Mitchell, A. 1994. The Lucombe Oaks. The Plantsman 15(4):216-224.

R Rhododendron

Argent, G., Bond, J., Chamberlain, D., Cox, P. & Hardy, A. 1997.

The Rhododendron Handbook 1998. Rhododendron Species in Cultivation. London: RHS.

Galle, F.C. 1985. Azaleas. Portland, Oregon: Timber Press.

Leslie, A.C. (comp.) 2004. The International Rhododendron Register and Checklist

(2nd ed. & Supps 1-5). Supps 1-7, 2004-2012. London: RHS.

Ribes

Crawford, M. 1997. Currants and Gooseberries: Production and Culture. Dartington, Devon:

Agroforestry Research Trust.

Rosa

Beales, P., Cairns, T., et al. 1998.

Botanica's Rose: The Encyclopedia of Roses. Hoo, Kent: Grange Books.

Cairns, T. (ed.). 2000.

Modern Roses XI. The World Encyclopedia of Roses. London: Academic Press.

Dickerson, B.C. 1999. The Old Rose Advisor. Portland, Oregon: Timber Press.

McCann, S. 1985. Miniature Roses. Newton Abbot, Devon: David & Charles.

Pawsey, Angela (ed.) 2012. Find That Rose! 2012-2013. (30th ed.) Colchester, Essex.

Quest-Ritson, C. 2003. Climbing Roses of the World. Portland, Oregon: Timber Press.

Quest-Ritson, C. & Quest-Ritson, B. 2003. The Royal Horticultural Society Encyclopedia of Roses:

The Definitive A-Z Guide. London: Dorling Kindersley.

Thomas, G.S. 2004. The Graham Stuart Thomas Rose Book (Revised edition). London: John Murray.

HelpMeFind Roses. Aug. 2012.

Roscoea

Cowley, J. 2007. The Genus Roscoea. Kew Publishing.

Rosularia

Eggli, U. 1988. A Monographic Study of the Genus Rosularia. Bradleya (Supp.) 6:1-118.

Hortax compilation of references and links to literature, websites , genera and other plant groupings

Page 22

S Saintpaulia

Goodship, G. 1987.

Saintpaulia Variety List (Supp.). Slough, Bucks: Saintpaulia & Houseplant Society.

Moore, H.E. 1957. African Violets, Gloxinias and Their Relatives. A Guide to the Cultivated

Gesneriads. New York: Macmillan.

Salix

Newsholme, C. 1992. Willows. The Genus Salix. London: Batsford.

Stott, K.G. 1971 Willows for Amenity, Windbreaks and Other Uses. Checklist of the Long Ashton

Collection of Willows, with Notes on their Suitability for Various Purposes. Long Ashton Research

Station: University of Bristol.

Salvia

Clebsch, B. 2008. The New Book of Salvias. Portland, Oregon: Timber Press.

Compton, J. 1994. Mexican Salvias in Cultivation. The Plantsman 15(4):193-215.

Middleton, R. Aug. 2012. Robin’s Salvias.

Saxifraga

Bland, B. 2000. Silver Saxifrages. Pershore, Worcs.: Alpine Garden Society.

Dashwood, M. & Bland, B. 2005. Silver Saxifrages: RHS Bulletin No 9. Wisley, Surrey: RHS.

McGregor, M. 1995. Saxifrages: The Complete Cultivars & Hybrids: International Register of

Saxifrages. (2nd ed.). Driffield, E. Yorks: Saxifrage Society.

McGregor, M. Aug. 2012. Saxifrage Society.

Sedum

Evans, R.L. 1983. Handbook of Cultivated Sedums. Motcombe, Dorset: Ivory Head Press.

Lord, T. 2006. Sedum up for assessment. The Plantsman 5(4):244-252.

Stephenson, R. 1994. Sedum. The Cultivated Stonecrops. Portland, Oregon: Timber Press.

Sempervivum

Miklánek, M. Aug. 2012. List of Cultivars: Sempervivum and Jovibarba.

Diehm, H. Aig. 2012. www.semperhorst.de

Sinningia

Dates, J.D. 1988. The Gesneriad Register 1988. Check List of Names with Descriptions of Cultivated

Plants in the Genus Sinningia. Galesburg, Illinois: American Gloxinia and Gesneriad Society, Inc.

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Page 23

Solenostemon

Pedley, W.K. & Pedley, R. 1974.

Coleus - A Guide to Cultivation and Identification. Edinburgh: Bartholemew.

Sorbus

McAllister, H. 2005.

The Genus Sorbus: Mountain Ash and Other Rowans. Kew: Royal Botanical Gardens.

Snyers d'Attenhoven, C. 1999. Sorbus Lombarts hybrids Belgische Dendrologie: 76-81. Belgium.

Wright, D. 1981. Sorbus - a Gardener's Evaluation. The Plantsman 3(2):65-98.

Spiraea

Miller, D.M. 2003. Spiraea japonica with coloured leaves: RHS Bulletin No 4. Wisley, Surrey: RHS

Streptocarpus

Arnold, P. 1979. The Gesneriad Register 1979: Check List of Streptocarpus. Binghamton, New York:

American Gloxinia & Gesneriad.

Dibleys Nurseries Online Catalogue. Aug. 2012.

Succulents

Eggli, U. (ed.) 2002.

Illustrated Handbook of Succulent Plants. Heidelberg, Germany: Springer-Verlag.

Eggli, U. & Taylor, N. 1994.

List of Names of Succulent Plants other than Cacti Published 1950-92. Kew: Royal Botanic Gardens.

Grantham, K. & Klaassen, P. 1999.

The Plantfinder's Guide to Cacti and Other Succulents. Newton Abbot, Devon: David & Charles.

Jacobsen, H. 1973. Lexicon of Succulent Plants. London: Blandford.

Syringa

Vrugtman, F. 2000. International Register of Cultivar Names in the Genus Syringa L. (Oleaceae).

(Contribution No 91). Hamilton, Canada: Royal Botanic Gardens.

T Thymus

Easter, M. 2009. International Thymus Register and Checklist. UK: Owl Prints.

Trillium

Case, F.W.J. & Case, R.B. 1997. Trilliums. Portland, Oregon: Timber Press.

Jacobs, D.L. & Jacobs, R.L. 1997.

American Treasures. Trilliums in Woodland Garden. Decatur, Georgia: Eco-Gardens.

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Page 24

Tulipa

Scheepen, J. van (1996) Classified List and International Register of Tulip Names.

Bodegom, S. & Scheepen, J. van (2005)

Supplement Classified List and International Register of Tulip Names 1996

U Ulmus

Green, P.S. 1964.Registratration of Cultivar Names in Ulmus. Arnoldia (Jamaica Plain) 24:41-80.

V Vaccinium

Trehane, J. 2004. Blueberries, Cranberries and Other Vacciniums. Portland, Oregon: Timber Press.

Viburnum

Dirr, M.A. 2007. Viburnums: Flowering Shrubs for Every Season. Portland, Oregon: Timber Press.

Viola

Coombes, R.E. 2003. Violets. (2nd ed.). London: Batsford.

Fuller, R. 1990. Pansies, Violas & Violettas. The Complete Guide. Marlborough: The Crowood Press.

American Violet Society.Aug. 2012.

Vitis

Robinson, J. 1989. Vines, Grapes and Wines. London: Mitchell Beazley.

W Weigela

Howard, R.A. 1965. A Checklist of Cultivar Names in Weigela. Arnoldia (Jamaica Plain) 25:49-69.

Wisteria

Valder, P. 1995. Wisterias. A Comprehensive Guide. Balmain, Australia: Florilegium.

Y Yucca

Smith, C. 2004. Yuccas: Giants among the Lilies. NCCPG.

Z Zauschneria

Robinson, A. 2000. Focus on Plants: Piping Hot (Zauschneria Cultivars).

The Garden (RHS) 125(9):698-699.

Zingiberaceae

Branney, T.M.E. 2005.

Hardy Gingers. Including Hedychium, Roscoea and Zingiber. Cambridge: Timber Press.