. Plant species of concern and plant associations of Powder River county, Montana . 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
. Plant species of concern and plant associations of Powder River county, Montana . 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 common Indian breadroot (Psoralea escutentd) and silver scurf-pea {Psoralea argopJn'Ua) may occasionally be present in low numbers or in the suiTounding grasslands. It was found in three of Uie four comers of Powder River County, and diere are more records of it here Powder River settings included ridgetop blowouts, and loose sand slopes around isolated upland Appendix C-13
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