Plant species of concern and plant associations of Powder River county, Montana E1C3380F-9100-4DF5-BBE8-6E6321664192 Year: 2002 Distribution: This species occurs from Albeita to Quebec and soutli to New Mexico and West Viiginia. It is concenti'ated around tlie Great Lakes and tlie Great Plains. It is known from five counties in eastern Montana. This species was documented for tlie first time in Powder River County at two sites in tlie nortli eastern comer. Habitat: In the Great Plains, it is resti'icted to sparsely vegetated loose sand, most often associated witli sand dunes. A typical sand
Plant species of concern and plant associations of Powder River county, Montana E1C3380F-9100-4DF5-BBE8-6E6321664192 Year: 2002 Distribution: This species occurs from Albeita to Quebec and soutli to New Mexico and West Viiginia. It is concenti'ated around tlie Great Lakes and tlie Great Plains. It is known from five counties in eastern Montana. This species was documented for tlie first time in Powder River County at two sites in tlie nortli eastern comer. Habitat: In the Great Plains, it is resti'icted to sparsely vegetated loose sand, most often associated witli sand dunes. A typical sand dune blowout is Figure 18. Photograph of ^^^^^^'' ^^^^''^ Cvpenis schweimtzii (close-up) ^^- ^^ occupies sandy ecological sites. The Powder River County settings represent small blowouts at toeslope positions where there is loose sand eroded from sandstone outcrops above. This is a different setting than has been found to date, and may mean that tlie species is not so naiTow in its habitat requirements as previously intei'preted. It was more common in the setting where tliere was more wind erosions. Associated species included prairie sandreed (Calamovilfa lougifoha). tlireadleaved sedge {Carex fihfoUa), and western spidei'wort {Tradescantia occidentalis). While this species often overlaps with Chenopoditim snbglabnuti (discussed previously), and is found in a wider range of successional conditions, it was not found in tlie same habitats in tliis study. While there were no other nearby blowout features along Cedar and Stump creeks, the Elso-Ocean Lake association and the sandy ecological range site tliat tliis landscape represents are widespread (Parker etal. 1971). Comments: Maintenance of tlie species' early- succession habitat requires balances involving grazing and/or fire. The species may decline in tlie absence or excess of these. Leafy spurge is in early stages of invading some of its most extensive habitat in the state. The Powder River populations occur in primaiy ran
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