Flora of North America species comparison

ascending to decumbent, slender to stout and fistulose, glabrous, sometimes glabrate at proximal nodes.

(1.5–)2.5–13 cm;

stipules distinct, 2–7 mm, membranous becoming papery;

leaflets (11–)15–31, blades narrowly elliptic, oblong-elliptic, or oblong-obovate, (3–)5 mm, apex acute, obtuse, obtuse and apiculate, or, sometimes, emarginate, surfaces pubescent abaxially, pubescent or glabrous adaxially.

in subglobose or oblong heads, densely (8–)10–35-flowered, flowers spreading and ascending;

axis 0.7–7 cm in fruit;

bracts 1.2–2 mm;

bracteoles 0(or 1).

incurved-ascending, 2–13 cm.

0.2–1.3 mm.

7.8–10.2 mm;

calyx campanulate, 3.8–6 mm, villosulous or loosely strigulose, tube 2.3–4.4 mm, lobes subulate or subulate-triangular, 1–2.5 mm;

corolla whitish or cream, sometimes tinged with pale lilac;

banner recurved through 40°;

keel 5.9–8.4 mm, apex blunt, deltate.

subpersistent or very tardily disjointing, spreading and ascending, crowded into dense, subglobose or oblong-cylindric heads, 2.5–3.5 cm diam., pale green or faintly pink-tinged becoming stramineous, straight or slightly incurved, obliquely ovoid-acuminate or inversely pyriform, bladdery-inflated, 9–18 × 5–9 mm, thin becoming papery-membranous, hirsute.

11–14(–17).

hornii has an unusual geographic distribution: the upper San Joaquin Valley and the western edge of the Mojave Desert in California, and the western shore of Pyramid Lake in Nevada.

habitat for the species in the United States has been largely destroyed, with most collections more than 50 years old (D.

1998).

minutiflorus M.

.

is known from Baja California.