Flora of North America species comparison

climbing or trailing, 100–400+ cm.

stipules spreading or reflexed, triangular to lanceolate, 1.5–3.5 × 0.5–1.5 mm, often strigillose;

petiole (2–)3–6(–9) cm;

rachis (0.5–)1–2(–2.5) cm;

stipels ovate to lanceolate, 1–2.5 mm;

leaflet blades ovate to rhombic-ovate, (1–)3–13 × (1–)3–12 cm, membranous to leathery, venation not reticulate, base rounded to depressed-ovate, apex acute to acuminate or obtuse, surfaces abaxially sparsely to densely covered with ascending and uncinate hairs, adaxially glabrous or sparsely covered with ascending and uncinate hairs.

usually with basal and lateral branches developed along main axis (compound raceme), 8–55 cm;

axis sparsely to densely covered with uncinate and often ascending hairs;

rachis (2.5–)8–27.5 cm, with 5–32 often scattered, biflorous nodes, secondary rachis often developed with 3–5 flowers;

primary bracts ovate to lanceolate, 1–4 × 0.3–1.2 mm, 3-veined, glabrous or strigillose;

secondary bracts usually caducous, ovate, 0.5–2.5 × 0.4 mm.

(1–)5–25 cm.

4–9 mm, sparsely covered with uncinate, and often, ascending hairs;

bracteoles usually persistent, ovate to oblong, 0.5–1.2 mm.

calyx campanulate, 3–3.5 mm, glabrous or sparsely covered with ascending hairs;

abaxial and lateral lobes triangular;

adaxial lobes connate;

corolla usually pink to light purple, rarely white, 10–12 mm;

banner usually wider than long, 5–8 mm, apex emarginate, glabrous;

wings obovate, 10–12 mm;

keel 6–7.5 mm;

ovary linear, 5 mm;

style twisted at apex.

pendent, compressed, oblong-falcate, (30–)45–78(–86) × 7.5–13 mm, elastically dehiscent, valves papery to slightly leathery, strigillose.

4–6, light brown, blackish mottled, oblong to reniform, 6–13 × (4–)5–8.3 mm, smooth;

hilum oblanceolate, (1.6–)2.3–3.2 mm.

perennial, with tuberous taproots.

= 22.