Flora of North America species comparison

erect or ascending, (0–)1–12+ cm underground, villous.

(2–)3–12 cm;

stipules distinct, subterranean ones often fully amplexicaul but distinct, 7–15 mm, foliose at distal nodes;

leaflets (5–)7–13(–15), blades elliptic, oblong or lanceolate-elliptic, 10–30(–35) mm, pinnately veined, apex obtuse to rounded, surfaces sparsely villosulous or villous abaxially, glabrous adaxially.

appearing subumbellate, loosely 5–11-flowered;

axis 1–5 cm in fruit;

bracts (1.5–)2.5–3.8 mm;

bracteoles 0.

erect, 3–9.8 cm, usually longer than subtending leaf.

1.5–5 mm.

13–19 mm;

calyx campanulate to subcylindric, 7.5–8.8 mm, villosulous, tube 6.3–8 mm, lobes broadly triangular, 0.6–0.8 mm;

corolla yellowish with whitish margins, banner sometimes purple bordered white, keel 13.2–16 mm.

green becoming brown, ± straight, ovoid, inflated, 15–21 × 5.5–8 mm, papery-membranous, black-pilose, hairs to 0.5 mm;

stipe 5–7 mm, pubescent.

6–10.

.

(1983) regarded the widespread Astragalus wootonii as intergradient with A. allochrous, and the two are sympatric over much of the range of the latter.

placed A. wootonii into A. allochrous as var. playanus.

proposal has merit but merely moves the resolution of the problem of distinction to another level.; the plants contain swainsonine and are potentially poisonous to livestock (L.

.

and S.

.

1992).

= 16.