Flora of North America species comparison

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

erect or ascending, clustered, 50–150 cm, simple or branched distally, villous.

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.

stipules subulate to narrowly triangular, to 6 mm;

petiole 1–3 mm, shorter than rachis;

leaflet blades usually narrowly elliptic-oblong, rarely linear, with raised, whitish reticulate veins adaxially, apex apiculate, surfaces densely whitish gray- or silvery-sericeous abaxially, densely appressed-sericeous or glabrescent adaxially;

laterals slightly smaller;

terminal blade 20–40 × 2–14 mm, length 2–5(–8) times width.

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

capitate, 15+-flowered, flowers closely clustered distally, congested, flowers chasmogamous and cleistogamous, racemes shorter than to 1.5 length of subtending leaves.

equal to or much longer than subtending leaves.

shorter to longer (to 1.5 times) than subtending leaves.

to 1 mm;

bracteoles longer than calyx tube.

1–3 mm;

bracteoles longer 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 8–12 mm;

calyx 8–12 mm, longer than corolla, tube 2 mm;

lobes 5, lateral narrowly ovate, 7–8 mm, apices spinelike;

corolla yellow-white or cream and often purple-marked;

wings 6.5–7 mm;

keel 6 mm.

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

stipe subsessile.

chasmogamous included in calyx, oblong, 4–7 × 3–4 mm, cleistogamous similar to chasmogamous, sericeous;

stipe subsessile.

= 20.