. Botanische und Vegetation Umfrage von Carter County, Montana, Büro für Landmanagement - verabreicht. Botanik; seltener Pflanzen., daß es 3 samenanlagen pro locule. Diese weite Auslegung nicht mit dem jüngsten Behandlung durch RoUins (1993), die diese Taxa erkennt als separate, oder Der earher taxonomische Forschung von MuUigan (1967 Stimmen). Wir erkennen diese Behandlungen in dem S. brassicoides ist endemisch auf der Great Plains. Mai 1998 Physaria brassicoides Montana Vertrieb: Dom (1984) hsted^^"^^^'^^^""^^"^^"" p°^ Physaria brassicoides als iexpectedi in Sou
2119 x 1179 px | 35,9 x 20 cm | 14,1 x 7,9 inches | 150dpi
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. Botanical and vegetation survey of Carter County, Montana, Bureau of Land Management-administered lands . Botany; Rare plants. that it may have 3 ovules per locule. This broad interpretation does not agree with the most recent treatment by RoUins (1993) which recognizes these taxa as separate, or the earher taxonomic research of MuUigan (1967). We recognize these treatments in which P. brassicoides is endemic to the Great Plains.. May 1998 Physaria brassicoides Montana distribution: Dom (1984) hsted ^^"^^^'^ ^^""^'^ "^^'"p°^ Physaria brassicoides as iexpectedi in southeast Montana but it was not verified in the state until 1994 when it was collected from Carter County by Keith Dueholm (Heidel and Dueholm 1995). To date, all known Montana occurrences are in Carter County. Carter County distribution: Two locations were found in 1994 on the Custer National Forest in the Ekalaka Hills and the Long Pines units (Heidel and Dueholm 1995). In 1997 the species was collected twice from BLM land in northeastern Carter County in the vicinity of Chalk Buttes (Newberry Knob) and in the badlands out the Powderville Road on the western edge of the county. HABITAT: Rollins (1993) describes habitat throughout its range as ibare hillsides, dry gravel and clay soil, badlands, clay knolls and banks.i All Montana populations of Physaria brassicoides occur on sparsely vegetated, steep, eroding, south-facing slopes of highly dissected breaklands and badlands. Substrate parent materials are both sandstone and shale. Three of the sites are at the contact zone of sandstone overlying shale, with both parent materials influencing topography and erosion processes; the upper horizons at these sites are sandy. The Powderville Road site is on the sides of gullies eroded in soft shale. These eroding slopes do not support stable vegetation communities and have 80-90% exposed substrate. Immediately associated plant species at two or more sites include the shrubs skunkbush s
