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Sego Lily September 2007 30(5) September 20 07 Volume 30 Number 5 In this issue: The Limits of R estoration in an A ge of Weeds . . . . . . . . . . . . 1 Chapter New s and Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Bulletin Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 How on Earth did They get There? . . . . . . . . . . . . . . . . . . . . . . 6 Statistical Summary of the Exoti c Flora of Uta h . . . . . . . . . . . 6 Introduced and Naturalized Plants of Utah . . . . . . . . . . . . . . . 7 The Limits of Restoration in an Age of Weeds By Douglas N. Reynolds Weeds have afflicted humanity for hun- dreds of years as evidenced by the following quotations: Cursed is the ground for thy sake; in sorrow shalt thou eat of it all the days of thy life; thorns and thistles shall it bring forth to thee. - Genesis 3:17-18 I will go root a way the noisome weeds, which without profit suck the soil’s fertility from wholesome flowers . - W. Shakespeare, Richard II While weeds have long had serious eco- nomic effects when they establish and com- pete with agricultural crops, what should concern members of a native plant society most are weeds’ e xponentially-increasi ng effects on natural communities. The Plant Conservation Alliance estimates that more than 1000 weed species are invading natural plant communities in the United States alone. As human impacts intensify through livestock grazing, off-road vehicle use, and other disturbances, it is estimated that 4600 acres of western Federal lands are invaded each day and that more than 40% of the species on the Endangered List are at risk from invasive species. Weeds impact native species not only through direct competition for light, water, and Continued on page 5 Exotic Plants of Utah Copyright 2007 Utah Native Plant Society. All Rights Reserved. Above: Creeping buttercup ( Ranunculus repens ) is a native of Eurasia that has become widely established across North Amer- ica. This species can be recogn ized by its compound leaves and ability to root at the n odes. A many-petaled form (var. pleni- florus) is sometimes observed, but most individuals have 5 pet- als (var. repens). Illustration by W. Fertig.

September-October 2007 Sego Lily Newsletter, Utah Native Plant Society

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