Flora of North America species comparison

70(–100) dm, gland-dotted distally when young, glands orange, silvery-silky to glabrate.

divergent;

sterile shoots sharp-tipped or thornlike.

unifoliolate, 0.2–2.2 cm, leaflet 1, blade oblanceolate or cuneate-oblanceolate, surfaces gland-tipped abaxially, strigulose.

loose;

rachis with thornlike tip in anthesis, 1–4 cm;

bracts ovate, 0.5–8 mm;

bracteoles present.

calyx 4.5–5.2 mm, silky-strigulose, tube 3–3.8 mm, ribs not prominent, intervals each with (0 or)1(or 2) large glands, lobes ovate, abaxial lobe shorter;

corolla indigo-blue;

banner obcordate, 6.4–7.5 mm, base auriculate, claw linear to cuneate;

wings broadly oblanceolate, 5.5–6.8 × (2.4–)3–4.5 mm;

keel obovate, 6.6–8.2 × 4.2–5.4 mm;

stamens 9.5–11.5 mm;

filaments distinct to 4.1–4.9 mm;

anthers 0.7–1.1 mm, connective gland-tipped.

obovoid, 3–4 mm, with several glands proximally, pilosulous distally.

rarely 2, 3 mm.