. Botanical survey of the Ruby Range, Madison County, Montana, Dillon Resource Area, Bureau of Land Management . Botany; Botany; Rare plants; Rare plants. the Beaverhead National Forest in the Tendoys (Vanderhorst 1995a) and to the north on BLM land in the drainage of Grasshopper Creek (Heidel and Vanderhorst 1996, Vanderhorst 1995b). In 1996 the species was found by Bonnie Heidel on BLM land in the Ruby Range, the first occurrence documented in Madison County. There are now a total of nine occuiTences known in Montana (see state distribution map).. Local distribution: One population was docum
. Botanical survey of the Ruby Range, Madison County, Montana, Dillon Resource Area, Bureau of Land Management . Botany; Botany; Rare plants; Rare plants. the Beaverhead National Forest in the Tendoys (Vanderhorst 1995a) and to the north on BLM land in the drainage of Grasshopper Creek (Heidel and Vanderhorst 1996, Vanderhorst 1995b). In 1996 the species was found by Bonnie Heidel on BLM land in the Ruby Range, the first occurrence documented in Madison County. There are now a total of nine occuiTences known in Montana (see state distribution map).. Local distribution: One population was documented in the study area in Laurin Canyon on the northeast flank of the Ruby Range. It is present in at least two openings on the lower south facing slopes of the lower 1/2 mile of the canyon. The species was not seen during June surveys in canyons on the west and southeast flanks of the Ruby Range, and it was not possible to conduct a complete survey in July because the plant was inconspicuous after flowering and was beginning to dry. HABITAT: Lomatium attenuatum grows on sparsely vegetated slopes in dry, poorly developed lithosols derived from limestone or volcanic parent materials. All but one Montana population, including the Ruby Range occun'ence, are in soils derived from limestone. The substrates usually have a high fraction of gravel and are well drained, unstable, and easily disturbed. Larger populations extend over all aspects and slope positions but over a half of the known Montana occuiTences including the one in the Ruby Range are confined to southerly aspects. Elevations range from 5,700 to 8,700 feet. Vegetation on most of these slopes is a patchy mosaic of evergreen tree and slirub communities with openings occupied by scattered bunchgrasses and forbs. The habitats are commonly dominated by Pinus flexilis (limber pine), Pseudostuga menziesii (Douglas fir), or Cercocarpus ledifoUus (mountain mahogany), and Agropyron spicatum (bluebunch wheatgrass) is usually the d
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