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Photo is of parent taxon

Hayden's milkvetch

Photo is of parent taxon

Nevada milkvetch, Nevada two-grooved milkvetch

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.

Astragalus bisulcatus var. haydenianus

Astragalus bisulcatus var. nevadensis

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
from FNA
AZ; CO; NM; UT; WY
[BONAP county map]
from FNA
NV
[BONAP county map]
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 Fabaceae > subfam. Faboideae > Astragalus > sect. Bisulcati > Astragalus bisulcatus Fabaceae > subfam. Faboideae > Astragalus > sect. Bisulcati > Astragalus bisulcatus
Sibling taxa
A. bisulcatus var. bisulcatus, A. bisulcatus var. major, A. bisulcatus var. nevadensis
A. bisulcatus var. bisulcatus, A. bisulcatus var. haydenianus, A. bisulcatus var. major
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)
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