Flora of North America species comparison

erect or ascending, strigulose.

(4–)5–14 cm;

stipules 2–6(–7) mm, thinly herbaceous becoming papery;

leaflets (15–)19–25(or 27), blades elliptic, linear-elliptic, or oblanceolate, 2–14 mm, apex obtuse to subacute, truncate-apiculate, or shallowly retuse, surfaces strigulose abaxially, glabrous adaxially.

(5–)8–20-flowered;

axis (2.5–)5–15 cm in fruit;

bracts 1.5–3.5 mm;

bracteoles 0.

ascending, often incurved, (7–)10–18(–20) cm.

1–4 mm.

11.7–15.2 mm;

calyx 6.6–8.8 mm, strigose, tube 4.5–6 mm, lobes lanceolate-subulate, 1.8–3.5 mm;

corolla ochroleucous, immaculate;

banner recurved through 50–85°;

keel (9.5–)10–11.7 mm.

pendulous, stramineous, straight or gently incurved, linear-ellipsoid, 3-sided and laterally compressed, lateral face flat, dorsal face grooved, (25–)30–45 × 2.5–3.3 mm, length mostly 10 times width, papery, finely strigulose;

septum 1.6–2.3 mm wide;

stipe 6–15 mm.

(16–)18–30.

.

(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).

= 24.