Flora of North America species comparison

erect or ascending, usually striate, 50–150 cm, usually glabrous, sometimes sparsely uncinate-pubescent or pilose.

ascending or erect, 50–100 cm, inconspicuously uncinate-puberulent.

trifoliolate;

stipules usually persistent, narrowly ovate or subulate, 10–20 mm;

petiole 40–70 mm;

leaflet blades ovate to broadly ovate, apex sharply acuminate to shortly cuspidate, surfaces glabrous (except veins spreading-villosulous);

terminal blade 50–120 × 30–70 mm, length 1.5–3 times width.

trifoliolate;

stipules caducous, narrowly deltate, 3 mm, glabrous;

petiole 5–20 mm;

leaflet blades linear, leathery, usually folded and appearing narrower, apex acute or obtuse, surfaces reticulate-veined adaxially, glabrous or sparsely puberulent abaxially, glabrous adaxially;

terminal blade 30–60(–80) × 5–7 mm, length 8–10 times width.

branched;

rachis densely uncinate-pubescent to rarely glabrescent;

primary bracts conspicuously covering apex of inflorescences, narrowly ovate, 8–14 mm.

branched or unbranched;

rachis uncinate-pubescent and villous;

primary bracts ovate, 2.5 mm.

4–8 mm, densely patent uncinate-puberulent and sparsely pilose.

5–10 mm.

calyx 3–4 mm, glabrate, margins sparsely ciliate, lobes pilose, tube 1.5–2 mm;

abaxial lobes 3–4 mm, lateral lobes 2–3 mm;

corolla purple, 8–12 mm.

calyx 1.5–2 mm, uncinate-puberulent, tube 0.8–1 mm;

abaxial lobes 1 mm, lateral lobes 0.7–0.8 mm;

corolla pink, 4–5 mm.

sutures dentate abaxially, sinuate adaxially;

connections adaxial, 1/2 as broad as segments;

segments (1–)4–7, obliquely narrow-rhombic or suborbiculate, (7–)9–11 × 4–5 mm, angled abaxially, slightly convex adaxially, sparsely uncinate-puberulent, sutures densely uncinate-puberulent;

stipe 1–2.5 mm.

sutures crenate abaxially, sinuate adaxially;

connections adaxial, 1/3–1/2 as broad as segments;

segments (1 or)2 or 3, semiorbiculate, 3.5–5 × 3 mm, symmetrically rounded abaxially, convex adaxially, densely uncinate-puberulent throughout;

stipe 0.5–3 mm.