Flora of North America species comparison

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

prostrate, lineate, to 100 cm, uncinate-puberulent and -pubescent, also sparsely to moderately pilose.

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 mostly persistent, inconspicuous, narrowly ovate, 2–5 mm;

petiole 5–21 mm;

leaflet blades orbiculate or broadly rhombic-ovate, apex rounded, surfaces glabrous or inconspicuously spreading-villous abaxially, glabrous adaxially;

terminal blade 15–30 × 10–30 mm, length 1–1.2 times width.

branched;

rachis densely uncinate-pubescent to rarely glabrescent;

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

densely flowered, ascending, usually terminal and branched, axillary and unbranched;

rachis uncinate-puberulent;

primary bracts caducous, ovate, 1–2 mm.

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

6–12 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 2 mm, puberulent and ± pilose, tube 1 mm;

abaxial lobes 1.5 mm, lateral lobes 1 mm;

corolla usually purple, rarely white, 3.5–5 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 deeply crenate abaxially, sinuate adaxially;

connections adaxial, 1/3 as broad as segments;

segments 2–4, ovate-orbiculate or obovate, 3.5–6 × 2.5–4 mm, symmetrically rounded abaxially, convex adaxially, uncinate-pubescent and pilose throughout;

stipe 1–2.5 mm.