Astragalus iodanthus var. diaphanoides |
Astragalus iodanthus var. iodanthus |
|
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Snake milkvetch, violet milkvetch, viper milkvetch |
Humboldt River milk vetch |
|
Stems | usually finely cinereous. |
glabrous or glabrate. |
Leaflets | (7 or)9–13(or 15). |
(7–)11–19(or 21). |
Flowers | calyx (3.3–)3.7–5.3 mm, tube 2.6–3.2 × 1.7–2.6(–2.9) mm, lobes (0.6–)1–2.2 mm; corolla pale lilac, keel tip usually darker lilac; banner 9–11.5 mm; wings shorter or slightly longer than keel. |
calyx (5–)5.5–8 mm, tube (3.4–)3.7–5 × 2.1–2.7 mm, lobes (1.3–)1.5–3 mm; corolla usually wine-purple, drying violet, lilac, or whitish with purple keel tip, rarely cream (concolorous); banner (10–)12–15.5 mm; wings longer than keel. |
Legumes | folded back on itself, mostly 3-sided compressed, (20–)25–35(–40) × (2.5–)3–5.5(–6) mm. |
curved to recurved, mostly dorsiventrally compressed, (20–)25–40 × (4.5–)5–8.5 mm. |
Seeds | 14–24. |
18–30. |
2n | = 22. |
= 22. |
Astragalus iodanthus var. diaphanoides |
Astragalus iodanthus var. iodanthus |
|
Phenology | Flowering Apr–Jun. | Flowering Apr–early Jul. |
Habitat | Alkaline clay or loam soils, often with sagebrush or juniper. | Sagebrush communities, sometimes in pinyon-juniper communities. |
Elevation | 700–2100 m. (2300–6900 ft.) | 1500–2400 m. (4900–7900 ft.) |
Distribution |
CA; ID; NV; OR |
CA; ID; NV; OR; UT |
Discussion | Variety diaphanoides is known from Lassen County in California, along the Bruneau, Malheur, Owyhee, and Snake rivers in Elmore, Owyhee, and Twin Falls counties in Idaho, Washoe County in Nevada, and Deschutes, Harney, and Malheur counties in Oregon. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety iodanthus is known from Mono County in California, southwestern Idaho, Malheur County in southeastern Oregon, northern and central Nevada, and Box Elder and Tooele counties in northwestern Utah. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. iodanthus var. vipereus | |
Name authority | Barneby: Leafl. W. Bot. 4: 50, figs. 20–23. (1944) | unknown |
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