Astragalus collinus Douglas ex Hook. var. collinus

  • Authors

    Rupert C. Barneby

  • Authority

    Barneby, Rupert C. 1964. Atlas of North American Astragalus. Mem. New York Bot. Gard. 13(1): 1-596.

  • Family

    Fabaceae

  • Scientific Name

    Astragalus collinus Douglas ex Hook. var. collinus

  • Type

    "On the subalpine range of the Blue Mountains, in dry soils...Douglas." —Holotypus, from "undulating and hilly grounds w. of the Rocky Mountains, in dry soils.," K! isotypi, BM, OXF!—Don’s specimen, formerly in herb. Lambert. (?), not located; he gives th

  • Synonyms

    Phaca collina Hook., Tragacantha collina (Hook.) Kuntze, Homalobus collinus (Hook.) Rydb.

  • Description

    Variety Description - Stipe of the pod (5) 6-15 mm. long; otherwise as given in the key. [Key: "Pod slenderly linear-oblong in profile 0.7-2.5 cm. long, 2.5-3.4 (4) mm. in diameter, straight or rarely a little incurved, the valves villosulous or loosely strigulose with hairs up to 0.25-0.5 mm. long; ovules (10) 12-18"]

    Distribution and Ecology - Bunchgrass prairies, grassy hillsides, and sagebrush valleys, in light sandy or stony soils overlying basalt, 900-3100 feet, forming colonies and locally abundant in central and southeastern transmontane Washington, extending southeast along the Snake River and its affluents from the south into westcentral Idaho and the north foothills of the Wallowa and Blue Mountains in Oregon, westward into Umatilla County; also apparently isolated on the upper Okanogan and lower Thompson Rivers in southern British Columbia.—Map No. 28.—May to July.

  • Discussion

    Within its area of dispersal the hill milk-vetch, A. collinus, is easily recognized by its greatly modified flower, remarkable for the tumid, basally pouched calyx of nearly the same color as the creamy petals, and for the relatively short, sigmoidally arched banner. The body of the pod is ordinarily straight, but is sometimes a trifle arched upward or downward. A noteworthy collection from Idaho County, Idaho, (Constance 1847, WS, WTU) combines a rather long, gently incurved pod with a developed banner, its limb recurved through about 50° rather than abruptly folded back a little below the apex. This may possibly represent a distinct race cut off from the main area of the species by the deeply dissected topography of the Salmon River canyon, but for the present too little evidence is available on which to base an opinion.

  • Objects

    Specimen - 01247712, C. L. Hitchcock 8240, Astragalus collinus Douglas ex Hook. var. collinus, Fabaceae (152.0), Magnoliophyta; North America, United States of America, Washington, Garfield Co.

    Specimen - 01247714, C. L. Hitchcock 8330, Astragalus collinus Douglas ex Hook. var. collinus, Fabaceae (152.0), Magnoliophyta; North America, United States of America, Washington, Garfield Co.

    Specimen - 01247736, A. Cronquist 6510, Astragalus collinus Douglas ex Hook. var. collinus, Fabaceae (152.0), Magnoliophyta; North America, United States of America, Oregon, Umatilla Co.

    Specimen - 01247726, J. H. Sandberg 196, Astragalus collinus Douglas ex Hook. var. collinus, Fabaceae (152.0), Magnoliophyta; North America, United States of America, Washington, Adams Co.

    Specimen - 01247719, J. W. Thompson 11668, Astragalus collinus Douglas ex Hook. var. collinus, Fabaceae (152.0), Magnoliophyta; North America, United States of America, Washington, Lincoln Co.

    Specimen - 01247718, J. W. Thompson 11668, Astragalus collinus Douglas ex Hook. var. collinus, Fabaceae (152.0), Magnoliophyta; North America, United States of America, Washington, Lincoln Co.

    Specimen - 01247736, A. Cronquist 6510, Astragalus collinus Douglas ex Hook. var. collinus, Fabaceae (152.0), Magnoliophyta; North America, United States of America, Oregon, Umatilla Co.

  • Distribution

    Washington United States of America North America| Idaho United States of America North America| Oregon United States of America North America| British Columbia Canada North America|