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balloonpod milkvetch, Whitney's milk vetch

Herbage

strigulose, hairs appressed or narrowly ascending, straight or subsinuous, (0.3–)0.4–0.6 mm.

Stems

low and diffuse or erect (when supported by sagebrush), 5–25 cm.

Leaves

(1.5–)3–11 cm;

leaflets 9–17(or 19), blades 2–13(–15) mm.

Racemes

(3–)5–15-flowered;

axis 1–4(–4.5) cm in fruit.

Flowers

calyx 4.5–6.4 mm, tube (3.5–)3.7–4.2(–4.7) mm, lobes 0.8–1.5(–1.8) mm;

corolla lilac or pink-purple, wing tips pale or white;

banner (8.3–)10–14.2(–16.5) mm.

Legumes

15–30(–40) × 10–18(–22) mm, glabrous;

stipe 2–4.5 mm.

Seeds

18–30.

2n

= 22.

Astragalus whitneyi var. whitneyi

Phenology Flowering May–Sep.
Habitat Slopes and ridges at or above timberline, sagebrush valleys and foothills.
Elevation 2000–3700 m. (6600–12100 ft.)
Distribution
from FNA
CA; NV
[BONAP county map]
Discussion

Ranging from the mountains of southern California through the Sierra Nevada to northwestern Nevada, the widespread var. whitneyi can usually be distinguished by its red-purple or pink-purple petals and the fruits of relatively medium size. Morphological characters overlap, and some specimens of vars. siskiyouensis and whitneyi can be distinguished only by origin.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Cusickiani > Astragalus whitneyi
Sibling taxa
A. whitneyi var. confusus, A. whitneyi var. lenophyllus, A. whitneyi var. siskiyouensis, A. whitneyi var. sonneanus
Name authority unknown
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