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All production samples were returned to the lab for drying and weighing. Drying occurred at lOSo C • until a stable weight was achieved (24 hours). Samples were weighed to the nearest 0.1 gram. 2.5 Rare and Endangered Plant Species A list of eight rare and endangered plant species that are known to occur within athirty-mile radius of the study area was developed from the Colorado Natural Heritage Program's System for Conservation Planning website (www.ndis.nrel.wlostate.edu/escoo/). Information regarding habitat requiremer~ and level of slate and federal protection was also acquired for each species from standard information databases or published sources. Based on a review of these known distributions, previous studies in the area, and required habitat requisites for the eight target flora, it was determined that only three of these taxa had at least modest potential for occurrence within the study area (Grsium perplexans, Penstemon retrorsus, and Penstemon mensarum). The entire list of eight taxa are as follows: Sensitive Plant Species Potentialry lkwring in tfie Study Area Common Name StaGis Habit t a Scientific Na Federal State Abode beardstongue Mancos Shale -barren, moist soils - in drainages or Rare or north-faring slopes - saltbrush/sagebrush community - none Threatened Penstemon re6» 5000' to 6 500' elevation Arizona centaury Associated with wetland /riparian habitats none Critically Imperiled Cer~urium arizoni Colorado desert-parsley I•lan~s FormaUOn -Abode Hills - assodated with sagebrush, shadsmle, greasewood and shrub oak - none Imperiled Lomatium condnnu 5500' to 7000' elevation Eastwood evening-primrose Abode Hills in bwer valleys none Critically Imperil Camissonia eastwoodia Grand Mesa penstemon Mourrbin slopes on brand Mesa Rare or Penstemon mensaru none Threatened Helleborine Seeps in sandstone dills and hillsides - hot firings - 4 800' to 6,000' elevation ' Sensitive Imperiled i dis i ante Thistle Adobe hills none Imperiled Grsium lexan Uinta Basin hookless radus Rodry hills -mesa slopes -alluvial benches -desert Rare or Sderoradus laucu shrub communities - 4,500' to 6,000' elevation Threaten Threatened Prior to implementation of field work, taxonomic desQiptions and botanical drawings of all eight target spades, with special emphasis on the three primary spaces, were nrefully reviewed and wmmitted to memory. In this manner a definitive search image was attained and the unique characteristics fadlitating field identification of suspect plants was fadlitated. Actual field work involved . extra search patterns in all portions of appropriate habitat encountered within the study area. Search G~oaa CreEtic Assocuhs, Irn: Page 6 E~ibit s - Brnvie WRDA Vegetation survey