Astragalus bisulcatus var. haydenianus |
Astragalus bisulcatus var. nevadensis |
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Hayden's milkvetch |
Nevada milkvetch, Nevada two-grooved milkvetch |
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Habit | Plants stout, erect or diffuse and spreading, herbage usually pubescent. | Plants decumbent or incurved-ascending, herbage usually pubescent. |
Leaflets | (13–)21–35, 5–27 mm. |
(7–)11–19, 5–27 mm. |
Racemes | 35–80-flowered; axis (4–)5.5–25 cm in fruit; bracts (2.5–)3–5 mm. |
(15–)25–45-flowered; axis (3–)6–20 cm in fruit; bracts 1–2.5 mm. |
Flowers | 8–11 mm; calyx usually pallid, tube 3.1–4 mm, lobes 1–2.7 mm; corolla white or whitish to ochroleucous; banner longer than keel. |
6.7–9.2 mm; calyx usually pallid, tube 2.8–3.2 mm, lobes 0.7–1.6 mm; corolla ochroleucous, keel tip maculate; banner shorter than keel. |
Legumes | ellipsoid or oblong-ellipsoid, (5–)6.5–9.5 × 2–4 mm, transversely rugose-reticulate, strigulose; stipe 1.4–3 mm. |
narrowly ellipsoid, 8–12 × 2.5–4 mm, delicately reticulate, white-strigulose; stipe 3–3.7 mm. |
Seeds | 5–8. |
6–8. |
2n | = 24. |
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Astragalus bisulcatus var. haydenianus |
Astragalus bisulcatus var. nevadensis |
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Phenology | Flowering May–Jul. | Flowering May–Jul. |
Habitat | Sagebrush-mountain brush, pinyon-juniper, ponderosa pine, and spruce-fir communities, on fine-textured, often saline, seleniferous substrates. | Knolls, hillsides, desert pans, on fine-textured white or red substrates, in pinyon, juniper, or sagebrush communities. |
Elevation | 1900–3300 m. (6200–10800 ft.) | 1500–2000 m. (4900–6600 ft.) |
Distribution |
AZ; CO; NM; UT; WY |
NV |
Discussion | Variety haydenianus from the Wasatch Plateau in Utah has been confused by some workers with the similarly pale-flowered var. major, but the flowers are consistently smaller, much more numerous, and the fruits smaller than in var. major. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety nevadensis is restricted to the northeastern quadrant of Nevada. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. haydenianus, A. bisulcatus subsp. haydenianus, A. grallator, Diholcos haydenianus, Tragacantha haydeniana | A. haydenianus var. nevadensis |
Name authority | (A. Gray) Barneby: Mem. New York Bot. Gard. 13: 413. (1964) | (M. E. Jones) Barneby: Leafl. W. Bot. 7: 195. (1954) |
Web links |