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<br /> <br />The major plant species along the creek area hybrid cottonwood <br />• Po ulus X acuminata), narrowleaf cottonwood (Po ulus angustifolia), <br />plains cottonwood (Po ulus sargentii), willows (Salix caudat<<, S. <br />exigua, S. interior, S. ligulifolia), ponderosa pine (P. o~nclerosa), <br />American mana-grass (5lyceria maxima ssp. rag ndis), buckbrusF~ (Sympori- <br />carpos occidentalis), and prairie sage (A. ludoviciana). Mary different <br />species of grasses and forbs are also found there. The tree species <br />occur randomly along the creek, and rarely form a forest. <br />Po ulus X acuminata occupies 32% of the relative cover for trees <br />along the creek. Average height of P. X acuminata is 9.6m (range <br />2-12m). Plains cottonwood trees average 4.8m in height (3.8% relative <br />cover), while the narrowleaf cottonwoods average 6m in height. (3-6% <br />relative cover). The willow species are about 2-3m in height but com- <br />prise 35-45% of the relative cover for plants taller 0.5m in height. <br />Principal grass species include American mana-grass (G. maxima ssp. <br />randis) which occupies 5-9% of the relative cover, and Poa f~alustris <br />(bluegrass) which occupies 3-6% relative cover. Litter comprises <br />about 3-59~ relative cover and bareground 12-16% relative cover. Seventy- <br />five to eighty percent of the relative cover along the creek is comprised <br />of forbs and other grasses. <br />Disturbed Area Type: <br />This vegetation type is largely restricted to plant species occupy- <br />ing disturbed areas at the project site. Disturbed area herE~ includes <br />mine-affected areas such as roadcuts and margins along settling ponds. <br />Typically, the plant species are considered to be weedy type; that are <br />well adapted to disturbed ground conditions. Many of the weedy plant <br />• species are native, but even more of them are introduced species from <br />J- 9 <br />