Flora of North America species comparison

usually twining or prostrate, rarely erect, densely strigose or hirsute, glabrescent; arising from subterranean, lignescent to woody taproots.

alternate, odd-pinnate;

stipules present, persistent, striate;

petiolate;

leaflets (1–)3(or 5), stipels persistent or caducous, sometimes absent, blade margins entire, often revolute, apex mucronate, surfaces usually pubescent, sometimes glabrous adaxially.

stipules striate, oblong to broadly oblong or lanceolate, 1.8–6.5(–7) × 0.4–3.2(–5.8) mm, slightly pubescent;

petiole canaliculate, 0.2–0.5 cm, hirsutulous, hairs sometimes retrorse;

rachis canaliculate, (0.7–)1–5.1 mm, hirsute;

stipels usually caducous, rarely present, acicular, 0.8–1.2 mm, densely pubescent;

leaflets 3 (sometimes basal leaves with 1–3), green, blades obovate or obovate-elliptic to orbiculate, (0.8–)1–5.4 × (0.6–)1–3.6 cm, base cuneate to obtuse, apex obtuse, venation conspicuous abaxially, slightly conspicuous adaxially, surfaces pubescent to densely pubescent.

1–6-flowered, axillary, racemes, fasciculate (usually with both chasmogamous and cleistogamous flowers), or with solitary flowers;

bracts present, subtending peduncles and pedicels, persistent, usually relatively small;

bracteoles persistent, paired or alternate proximal to calyx.

with 1 or 2(–4) flowers, 2.1–10 cm.

sulcate, (0.3–)2–35 mm, pubescent to slightly pubescent;

bracts striate, usually oblong, linear-oblong, ovate, or obovate-oblong, rarely lanceolate, 1.8–6.2 × 0.5–3.3 mm, apex acute or obtuse, densely pubescent, glabrescent.

0.5–6 (–17) mm, densely to slightly pubescent, hairs sometimes retrorse;

bracts linear, linear-lanceolate, lanceolate, or linear-oblong, 1.2–5 mm, slightly pubescent;

bracteoles linear to lanceolate, 1.2–7.2 mm, slightly pubescent.

papilionaceous;

calyx tubular [cylindric], lobes 5, sometimes adaxial pair fused, adaxial gibbous at base;

corolla purple, purple-pink, purplish blue, blue, pink, magenta, red-purple, violet, lilac, or lavender, glabrous;

banner base auriculate, short-clawed;

wings longer than keel, long-clawed, auriculate, distally spreading;

keel slightly incurved, long-clawed;

stamens 10, diadelphous;

anthers sub-basifixed, dehiscing laterally, pollen tricolporate;

ovary usually stipitate, pubescent, nectary disc at base;

style filiform, ± incurved, glabrous, stigma terminal with a crown of short cilia.

calyx green to purple, (10–)13–19 × 3–6 mm, pubescent, lobes 2.4–7.5 × 1.7–3.6(–5) mm, adaxial lobe deltate, 2.3–9.5 × 1.5–2.8(–5.2) mm, entire;

corolla purple, blue, magenta, red-purple, violet, lilac, or lavender;

banner broadly obovate to obovate or orbiculate, 22–35 × 11–29 mm, apex rounded or obcordate, rarely emarginate;

wings slightly obovate to oblong, 22–28.5 × 3–10.5 mm, claw 11–15 mm;

keel obovate-oblong, 15–20 × 3.2–4.5 mm, claw 9.5–15 mm;

staminal tube 12–19.5 mm, free filaments 1–2.7 mm, vexillary stamen 9.5–13 mm;

anthers oblong-elliptic, (0.4–)0.5–0.9 × 0.2–0.7 mm;

ovary linear-oblong, 15–19.5 × 0.7–0.8 mm, densely pubescent;

style 1.9–3.5 mm;

stigma 0.2–0.4 mm diam.

legumes, sessile or stipitate, compressed or slightly turgid, linear to falcate or strongly curved, dehiscent, cleistogamous fruits smaller, pubescent.

(chasmogamous) slightly curved, 3–4.4 ×0.4–0.5 cm, valves densely pubescent.;

legumes (cleistogamous) straight, (1.5–)2–3.8 × 0.4–0.5 cm, valves densely pubescent;

stipe 1.5 mm.

2–10(or 11), compressed, usually oblong, orbicular, or subquadrate, rarely rhombic or elliptic;

testa smooth, hilum lateral, ovate, rim-aril and epihilum conspicuous.

(chasmogamous) 7–10, light to dark brown, with darker patterns, usually orbicular, rarely oblong, rhombic, or elliptic, 2.1–2.8 mm.;

seeds (cleistogamous) (1 or)2–8(–11), brown, with darker patterns, usually orbicular, rhombic, or elliptic, rarely oblong, 1.8–3.3 mm.

= 11.

= 44.