Astragalus beckwithii |
Astragalus nudisiliquus |
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Weiser's milkvetch |
cobblestone milkvetch |
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Habit | Plants perennial, caulescent, mat-forming, white tomentose, hairs basifixed. | |
Stems | several–numerous, prostrate; (2)5–25(30) cm. |
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Leaves | 3–11 cm; leaflets (7)11–17, broadly obovate; ovate-cuneate or broadly oblanceolate, 4–17 × 2.5–6.5 mm; tips obtuse, emarginate or subacute; surfaces abaxially white tomentose, adaxially tomentose, sometimes more thinly so and greenish; stipules (1.5)3–7 mm; free. |
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Inflorescences | racemes subcapitate; (2)4–8-flowered; peduncles 1–7 cm; bracts (1.5)3–6 mm; pedicels 1.4–3.4 mm; bracteoles 0–2. |
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Flowers | ascending at anthesis; calyces 12–17(19) mm, often purplish-tinged, thinly villosulous with mainly white hairs; tubes 10–14 mm; teeth subulate or subulate-setaceous; (2)3–5 mm; corollas 19–25.5 mm, pink-purple; ovules 30–41. |
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Fruits | unilocular, ascending, humistrate, obliquely-ovoid or oblong-ellipsoid, obcompressed; (15)20–40(45) × (8)9–13 mm, villous-hirsute; hairs not concealing valve surfaces; valves coriaceous; stipes 0. |
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Astragalus beckwithii |
Astragalus nudisiliquus |
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Distribution | ||
Discussion | Rocky slopes, sandy riverbanks, cobblestone alluvia, eroded slopes with sagebrush. Flowering May–Jun. 600–1400 m. Owy. ID. Native. Astragalus nudisiliquus may resemble A. purshii, but the latter’s valve surfaces are usually completely concealed by dense pubescence. In A. nudisiliquus, the valve surfaces are easily seen through the hairs. |
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Source | Flora of Oregon, volume 2, page 670 Richard Halse |
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Sibling taxa | ||
Subordinate taxa | ||
Web links |
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