. Botanical and vegetation survey of Carter County, Montana, Bureau of Land Management-administered lands . Botany; Rare plants. Astragalus barrii Barr's Milkvetch. May 1998 Carter County distribution: The occurrence record in Carter County represents a 1943 collection ifrom Ekalakai which is cited in Bameby (1964). Field surveys in 1986 and 1989 in the vicinity of Ekalaka did not relocate the species. In the course of this study, we have ruled out the likelihood of it occurring on BLM- administered land in the vicinity of Ekalaka. We have also ruled out the likelihood of it in most of norther
. Botanical and vegetation survey of Carter County, Montana, Bureau of Land Management-administered lands . Botany; Rare plants. Astragalus barrii Barr's Milkvetch. May 1998 Carter County distribution: The occurrence record in Carter County represents a 1943 collection ifrom Ekalakai which is cited in Bameby (1964). Field surveys in 1986 and 1989 in the vicinity of Ekalaka did not relocate the species. In the course of this study, we have ruled out the likelihood of it occurring on BLM- administered land in the vicinity of Ekalaka. We have also ruled out the likelihood of it in most of northern Carter County, but not in the whole county. The timing or extent of baseline survey in western ends of the county with potential habitat was not suited for inventorying this species. These areas may be similar to the populations along the Powder River breaks in Powder River County. In the plant association and community type constancy/cover tables (Appendix A), mat forming 3- leaflet milkvetches were provisionally identified as tufted milkvetch (Astragalus gilviflorus; ASTGIL), which is many magnitudes more common as well as more widespread in distribution than Harris milkvetch. HABITAT: Montana habitats of Harris milkvetch are mostly sparsely vegetated knobs and buttes, usually with dry, fme-textured, often calcareous soils. Many are situated along rivers or streams, where downcutting has exposed shale and siltstone outcrops. It appears to be a poor competitor. The species is often locally confined to specific soil types and rock formations. The highest known numbers are on silty soils of the Midway series, representing calcareous, platy, soft shale with amontmorillonitic clay component (Heidel and Marriott 1996). However, it is apparently not restricted to this series in the state. The occupied microhabitat represents clayey and shallow clay range site associations that are sparsely vegetated and usually have scattered bunchgrass (bluebunch wheatgrass; Pseudoroegneria spica
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