Flora of North America species comparison

dimorphic; leafy stems ascending to erect, unbranched, 10–50 cm, glabrous or sparsely pilose;

leafless or nearly leafless stems essentially peduncles arising from base of plant, erect, divergent, or spreading, to 70 cm.

3-foliolate, 4–7 usually whorled, sometimes scattered on stem;

stipules deciduous and rarely observed, linear, 2–2.5 mm;

petiole 4.5–12.5 cm;

leaflets usually estipellate, rarely partly stipellate, blades with sparsely pilose veins on both surfaces, sometimes glabrate adaxially;

lateral blades oblique, nearly as large as terminal;

terminal blade rhombic, elliptic, obovate, or orbiculate, 4.5–12 × 3–8 cm, apex acute or short-acuminate.

on peduncle arising from base of plant, branched;

rachis white-pilose and uncinate-puberulent;

primary bract narrowly ovate to subulate, 5 mm.

slender, 10–25 mm, glabrous.

calyx 1.5–2.5 mm, white-puberulent, hairs scattered, long, stiff;

corolla usually pink, rarely white, 6–9 mm, keel connate along abaxial margin (enclosing reproductive organs).

1–4-articulate;

segments asymmetrically depressed-obtriangular, 7–12 × 4–5 mm;

stipe (5–)10–22 mm, glabrous or glabrate.