Flora of North America species comparison

monomorphic; ascending or spreading, branched or unbranched, 20–60 cm, uncinate-puberulent and sparsely pilose.

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, usually 4–6 and alternate;

stipules caducous, subulate to narrowly ovate, 1.5–5 mm, apex acute;

petiole 5.5–6.5 cm;

leaflets often estipellate, sometimes stipellate, surfaces appressed-pubescent;

lateral blade oblique, slightly smaller than terminal;

terminal blade broadly obovate to rhombic, 3–9 × 4–6.5 cm, apex acute or short-acuminate.

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.

usually terminal, mostly unbranched, sometimes axillary from distal leaf axils and relatively short;

rachis white-pilose and densely uncinate-puberulent;

primary bract linear to narrowly ovate, 1–4 mm.

on peduncle arising from base of plant, branched;

rachis white-pilose and uncinate-puberulent;

primary bract narrowly ovate to subulate, 5 mm.

stout, 2–7 mm, uncinate-puberulent.

slender, 10–25 mm, glabrous.

calyx 1.5–1.8 mm, white-puberulent, hairs rather abundant, long, stiff;

corolla white, 4.5–6.5 mm, keel distinct, not connate along abaxial margin (exposing reproductive organs).

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 or 2(or 3)-articulate;

segments asymmetrically obtriangular, 9–14 × 6–8 mm;

stipe 5–9 mm, uncinate-puberulent.

1–4-articulate;

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

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

= 22.