. Plant species of concern and plant associations of Powder River county, Montana . Plant communities; Endangered plants; Rare plants; Botany; Plant conservation. Figure 28. Illustration of Psoralea In^ogaea The common breadroot, Psoralea escnieiita, has a distinct flowering stem widi spreading pubesence on the stem and leaf petiole, while Psoralea hypogaea is stemless witli appressed pnbesence. Its flowers are at ground-level. Distribution: This species of the western Great Plains is found from eastern Montana soudi to Texas and New Mexico. In Montana, it is widely distributed across unglacia
. Plant species of concern and plant associations of Powder River county, Montana . Plant communities; Endangered plants; Rare plants; Botany; Plant conservation. Figure 28. Illustration of Psoralea In^ogaea The common breadroot, Psoralea escnieiita, has a distinct flowering stem widi spreading pubesence on the stem and leaf petiole, while Psoralea hypogaea is stemless witli appressed pnbesence. Its flowers are at ground-level. Distribution: This species of the western Great Plains is found from eastern Montana soudi to Texas and New Mexico. In Montana, it is widely distributed across unglaciated plains, documented from eiglit counties to Figure 29. Photogiaph of PsoraJea hypogaea tlian in any otlier county. It was otherwise reported from single isolated populations in studies diat were mainly smaller in scale (Heidel 1994, Heidel 1997, Vanderhorstetal. 1998). The sandstone outcrops of Powder River County are widespread but mostly small and isolated, so we make inference from the new disti'ibution information that die species is likely to be more widespread tlian previously known. Habitat: Little Indian breadroot occupies sandy ecological sites: mainly in the 10" to 14" precipitation, zone across grasslands and open pine woodlands on die eastern sedimentaiy plains. It is often found in tlie loose sand below sandstone outcrops, but is known from reworked alluvial sand deposits. It tends to occur in sparsely-vegetated niicrohabitats where more tlianhalf of tlie bare sand soil surface is exposed. Associated species include sand-loving species such as prairie sandreed (Calamorilfa longifoUa), Indian ricegiass {Oryzopsis hymenoides), annual buckwheat {Eriogoimin atmuum), priaire lupine (Litpimts lepidus), and western spiderwort {Tradescantia occideniahs). The dominant species of the suiTounding uplands may be inteniiingled, including blue giama (Bouteloua gracilis), needle- and-tliread (Stipa comata) and little bluestem {Schizachyrium scopariwn). Botli c
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