Flora of North America species comparison

trailing or twining, sometimes rooting at nodes, hirsute.

green to grayish brown, trailing, climbing, or erect, ribbed, hollow in age, hispid, with brown, spreading hairs.

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 widely ovate, distinctly peltate, 8–12 mm, ciliate;

petiole 5–21 cm;

rachis 2.5–4 cm;

stipels lanceolate, 4–7 mm;

leaflet blades ovate to widely ovate or lanceolate, 5–16 × 3–12 cm, base broadly cuneate or rounded, lateral ones oblique, apex acuminate, surfaces sparsely pilose.

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

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

floral nodes 2–12, clustered distally;

bracts deciduous, ovate-triangular, 3 mm.

to 30 cm.

to 20 cm.

ascending, curved distally, 3–5 mm;

bracteoles tardily deciduous, triangular, 1.5–2.5 mm.

arcuate, 1–2 mm;

bracteoles deciduous, striate, linear-lanceolate or oblong, 5 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 3–4 mm, lobes triangular, 1 mm;

corolla grayish yellow, 10–12 mm;

banner yellow-green outside, suboblate, 12 × 16 mm, auriculate;

wings yellow, ovate;

keel green tinged with red, falcate and incurved through 1 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.

spreading, yellowish brown, becoming black, linear, terete, 4–9 × 0.6 cm, beak straight, short, shortly hispid, hairs pale brown.

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

hilum white, not raised.

8–15, greenish or yellow-brown, often mottled black or green, globular to oblong or shortly cylindric, 2.5–4 × 2.5–3 mm;

hilum not raised, rim-aril not raised.

perennial.

annual.