Flora of North America species comparison

trailing or twining, sometimes rooting at nodes, hirsute.

trailing, climbing, or erect, angular, hollow, sparsely white-pilose.

stipules triangular, 3–5 mm, base slightly auriculate-cordate;

petiole 1.5–8 cm;

rachis 0.4–1 cm;

stipels linear, 1.5–2.5 mm;

leaflet blades ovate- or linear-lanceolate, 3–8 × 0.5–5 cm, base obtuse or rounded, apex acute or acuminate.

stipules lanceolate, distinctly peltate, 10–15 mm, lobe 0.2–0.4 cm;

petiole to 15 cm;

rachis to 3.5 cm;

stipels lanceolate, 3–5 mm;

leaflet blades ovate or rhombic-ovate, 5–10 × 5–8 cm, base cuneate or rounded, lateral ones oblique, margins entire or shallowly 3-lobed, apex broadly triangular or subrounded, surfaces sparsely pilose.

often flexuous, floral nodes 10–15, mostly clustered at apex;

bracts deciduous, ovate-lanceolate, 1–1.5 mm.

floral nodes 4 or 5, clustered distally;

bracts deciduous, triangular, striate, 4 mm.

to 30 cm.

to 16 cm.

ascending, curved distally, 3–5 mm;

bracteoles tardily deciduous, triangular, 1.5–2.5 mm.

arcuate, 5–8 mm;

bracteoles tardily dehiscent, narrowly lanceolate, 10–12 mm.

calyx tube 4.5–6 mm, apex acute to acuminate, adaxial lobe broader, 2.5–3.5 mm;

corolla yellow, 15–20 mm;

banner suborbiculate, 1.5–2 × 1.5–2 mm, with 2 basal auricles;

wings obliquely obovate, 15 × 1 mm;

keel broadly curved, vertically incurved, 15 × 5–6 mm;

style curved, extending beyond stigma into tip.

calyx tube 3 mm, lobes triangular, 1 mm;

corolla golden yellow, 15 mm;

banner oblate to subreniform, auriculate, apex emarginate;

wings ovate, broader than keel, shortly clawed, auriculate;

keel clawed, apex incurved nearly 0.5 circle, with lateral keel-pocket or hornlike appendage supporting left wing petal;

style incurved, elongate-beaked, lobelike appendage extending beyond stigma into slender tip.

pendulous, brown-black in age, linear, torulose, 4–7 × 0.5–0.8 cm, strigose to pilose.

pendulous, brown, straight or curved distally, terete, linear, 5–11 × 0.6–0.8 cm, valves papery, upper suture thickened, sparsely pilose, glabrescent.

5–12, brownish black, reniform, 4–6 × 3–4 mm;

hilum white, not raised.

5–10, grayish brown or red, oblong to cylindric, 8–8.5 × 4–5 mm, ends truncate or rounded;

hilum flattened, rim-aril white, raised.

perennial.

annual.