Flora of North America species comparison

ascending or erect, clustered, 30–160 cm, initially wandlike, branched apically, villosulous or appressed-pubescent.

erect or ascending, clustered, young branches terete, 70–200 cm, branched distally, densely appressed- or patent-pubescent.

stipules subulate to narrowly triangular, to 6 mm;

petiole 7–12 mm, longer than rachis;

leaflet blades narrowly elliptic-oblong to linear, base obtuse or cuneate, apex apiculate, surfaces appressed-pubescent abaxially, usually sparsely appressed-pubescent, sometimes glabrescent (but not glabrous), adaxially;

laterals similar to terminal;

terminal blade 10–35 × 3–5 mm, length 3–7 times width.

usually 2 sizes, axillary ones subtending racemes much smaller;

stipules subulate, 2–4 mm;

petiole 30–40 mm, longer than rachis;

leaflet blades usually elliptic to broadly elliptic or obovate, sometimes suborbiculate, apex retuse to obtuse, apiculate, surfaces appressed-pubescent abaxially, glabrous or sparsely puberulent along midrib adaxially;

terminal blade 20–50 × 10–30 mm, length 1–2 times width.

4–14-flowered, crowded distally, flowers chasmogamous and cleistogamous.

5–15-flowered, flowers chasmogamous only.

shorter than or equal to subtending leaves.

usually shorter than subtending leaves.

0.5–2 mm;

bracteoles shorter than calyx tube.

0.8–3 mm;

bracteoles shorter than calyx tube.

chasmogamous 5–7 mm;

calyx 3–4.5 mm, tube 1 mm;

lobes 4, lateral narrowly triangular, 1–1.5 mm, adaxial connate proximally;

corolla pink to purple;

wings 5–6 mm;

keel 4.5–5 mm.

10–15 mm;

calyx 4.5–6 mm, tube 2.5 mm;

lobes 4, subequal or abaxial slightly longer, lateral narrowly triangular-ovate, 2.3–3.5 mm, adaxial connate proximally, apices long-acuminate and spine-tipped;

corolla reddish purple;

wings 8–10.5 mm;

keel 7.5–9.5 mm.

chasmogamous exserted from calyx, suborbicular, 4–7 mm, cleistogamous exserted from calyx, calyx 1/5–2/5 loment length, similar to chasmogamous, 3.5–5 mm;

stipe 1 mm.

body exserted from calyx, broadly elliptic to suborbicular, 6–7 × 3.5–4.5 mm, densely white-appressed-pilose, sometimes glabrescent;

stipe subsessile.

= 20.

= 22.