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selenium. No plants proposed for threatened or endangered status were <br />encountered on the study area. <br />• <br />The majority of the species on the revegeteition plot flower in eazly- <br />late spring, produce mature seeds by mid-late simmer and are largely vege- <br />tative in the fall. Flowering may occur sooner on the more exposed <br />slopes at laser elevations and is sustained over a longer period antler <br />nnist conditions. <br />NOXIOUS WE®.S <br />The most recent listing of noxious weeds (State Noxious - Weed Seed Re- <br />quirements Recognized in the Administration of the Federal Seed Act, USDA, <br />January, 1978) was consulted to determine arhether any of the species listed <br />therein occurred on the revegetation area. The following noxious <br />weeds were encountered: <br />1. Agropyron reger - carrion quackgrass <br />2. Cirsium arvense - canada thistle • <br />3. Thlaspi arvensis -field pennycress , <br />None of the three species aze either abundant or widespread on the study <br />area as evidenced by their low representation in Dover and prroduction <br />sarnples. Of the three, quackgrass was the mist ca~nnn. It accounted for <br />4.38 of the total vegetation basal Dover ar~d 3.78 of the total canopy <br />cover (Appendix B). It occurred in Dover cuadrats at a frequency of <br />138. Field pennycress accounted for less than 0.48 of the total <br />vegetation canopy cover and was encountered :in only one of the 100 cover <br />quadrats sampled. Canada thistle was not enwuntered in cover quadrats. <br />All three species were represented in produ.c{ion samples. Quackgrass <br />accounted for 5.28 of the total vegetation production on the site while <br />Canada thistle and field pennycress both contributed less than 0.18. <br />These species are not anticipated to pose arnt problem with future revege- <br />tation efforts at the Seneca II reclamation. plot. <br />• <br />-12- <br />