Flora of North America species comparison

erect, trailing, or twining, 5–50 cm.

stipules sometimes red-purple pigmented, appressed to stem, reflexed or distally spreading, ovate to ovate-lanceolate, 1.8–6.5(–8.5) × 0.7–3(–4) mm (larger distally);

petiole 1.8–3.4 cm;

rachis 0.4–1 cm;

stipels subulate to ovate or lanceolate, 1–2.5 mm;

leaflet blades usually linear to lanceolate, sometimes narrowly trullate, sometimes terminal leaflets with 2 basal lobes each side, lateral leaflets often ± distinctly round lobed basally on 1 or both sides, laterals 2–4.7 × 0.5–1.3(–2.8) cm, terminal 2.4–5.6 × 0.3–1.2(–2.7) cm, thin, base attenuate, apex round or acute, obscurely apiculate, surfaces sparsely pubescent abaxially, scabrous adaxially.

2–18 cm;

axis sparsely covered with minute, uncinate hairs;

rachis 0.2–0.6 cm, with 1–3 (usually 1-flowered) nodes;

bracts lanceolate, 4 × 1.5 mm, 4–6-veined.

2–12 cm.

to 10 mm, shorter than flowers, uncinate-pubescent;

bracteoles persistent, ovate or obsolete, 0.1–0.5 mm.

calyx campanulate-tubular, 5–8 mm, adaxial proximal portion rounded, papillate, covered with minute, uncinate hairs;

abaxial lobes lanceolate;

lateral lobes usually triangular, sometimes falcate;

adaxial lobes connate nearly throughout;

corolla violet, lavender-pink, or purple, 15–25 mm;

banner obovate or spatulate, 12–16 mm, apex obtuse, emarginate;

wings obovate, 15–27 mm, rounded-auriculate on distal margin at base;

keel 10 mm;

ovary linear, 6–7.5 mm, glabrous, marginally scabrous.

horizontal to pendent, terete, linear-straight to slightly falcate, 35–45 × 3–4 mm, elastically dehiscent, valves leathery, glabrous.

8–11, usually brown to light brown or grayish green, punctate and mottled black, sometimes light green, oblong or reniform, 2–3.7 × 1.7–2.6 mm, smooth;

hilum ovate-oblong, 0.4–0.5 mm.

perennial, with deep-seated, oblong or spherical tuberous taproots.

= 22.