Flora of North America species comparison

erect, slender, 70–100 cm, mostly simple, with axillary, exserted inflorescences distally, pubescent.

ascending or sprawling, clustered, 10–50 cm, branched much of length, sericeous or glabrescent.

stipules subulate to narrowly triangular, to 5 mm;

petiole 6–10 mm, longer than rachis;

leaflet blades linear to narrowly oblong, apex rounded or obtuse, apiculate, surfaces densely sericeous abaxially, uniformly appressed-pubescent adaxially;

terminal blade 20–40 × 2–7 mm, length 2.5–7 times width.

usually 2 sizes, axillary ones subtending racemes much smaller;

stipules subulate, 2.5–6 mm;

petiole (5–)10–15(–20) mm, longer than rachis;

leaflet blades elliptic to narrowly elliptic, apex obtuse or retuse, apiculate, surfaces sericeous abaxially, glabrous adaxially;

laterals similar to terminal, without oblique base;

terminal blade 10–30(–40) × 8–22 mm (6–10 mm in axillary leaves), length 1.4–2.5 times width.

8–15-flowered, flowers lax on axis, flowers chasmogamous, cleistogamous rare, racemes shorter than to 1–4 times length of subtending leaves.

slender, 4–7-flowered, flowers not clustered at apex, flowers chasmogamous and cleistogamous.

equal to or much longer than subtending leaves.

usually much longer than subtending leaves, sericeous.

to 1 mm;

bracteoles longer than calyx tube.

0.5–3 mm, appressed-puberulent;

bracteoles shorter than calyx tube.

chasmogamous 5–6 mm;

calyx 4.5–6 mm, longer than corolla and loments, tube 1 mm;

lobes 5, lateral narrowly triangular to subulate, 4–5 mm, setaceous, villous, apices spinelike;

corolla whitish yellow or lavender-tinged;

wings 4.5–5.2 mm;

keel 4–4.5 mm.

chasmogamous 6.5–9 mm;

calyx 4–6 mm, appressed-puberulent, tube 1–1.2 mm;

lobes 4, lateral narrowly triangular, 2.5–3 mm, adaxial connate proximally, apices acuminate;

corolla purple;

wings 5.5–6.5 mm;

keel 6–8 mm.

chasmogamous included in calyx, rounded, 4–6 mm, cleistogamous similar to chasmogamous;

stipe subsessile.

chasmogamous as long as calyx, ovate to rounded, 5–7 mm, cleistogamous exserted from calyx, calyx 1/5 loment length, rounded, 4–5 mm;

stipe subsessile.

= 20.