Flora of North America species comparison

weak or vigorous twiners, often trailing, to 400 cm.

often reddish pigmented, prostrate or twining, to 300 cm, slender, terete or angulate, usually sparsely to densely covered with spreading, straight hairs, often yellowish, interspersed with white, hooked hairs.

stipules ascending, triangular to oblong, 1.5–3 × 0.5–2 mm;

petiole 2–8 cm;

rachis 0.5–2.5 cm;

stipels linear to lanceolate, often clavate, 1.3–2 mm, 1-veined;

leaflet blades linear to lanceolate or ovate to widely ovate, often weakly to conspicuously lobed on one or both sides basally, 2.5–11.5 × 0.3–5 cm, membranous to rigid, venation often prominent, base rounded or truncate to cuneate, apex acute to attenuate, surfaces abaxially sparsely to densely covered with minute, uncinate hairs, with incumbent hairs along veins and marginally, adaxially covered with sparsely incumbent and uncinate hairs.

stipules ascending or spreading, triangular to widely ovate or orbiculate, 4–7 × 3–4 mm, acute or obtuse, sometimes auriculiform, 3–many-veined, glabrate or strigillose, ciliate;

petiole 1–5(–8) cm;

rachis 0.5–2 cm;

stipels usually triangular to lanceolate, 1–3 × 1 mm, acute;

leaflet blades narrowly to widely ovate, often with a basal lobe, 1.5–9 × 1–7 cm, membranous or thin, rarely leathery, base broadly cuneate, apex obtuse or acute to long-acuminate, surfaces usually sparsely strigose or hirtellous, often glabrate.

to 26 cm;

main axis sparsely to densely covered with uncinate hairs;

rachis 2–24 cm, with 2–6 usually biflorous nodes;

peduncular basal bracts linear to lanceolate, 1–1.5 × 3–5 mm;

primary bracts ovate to lanceolate, 2–3 × 0.5 mm, 1–3-veined.

20–56 cm, axis usually covered with uncinate hairs, if straight hairs present, then mainly on peduncle;

rachis 5–12 cm, with 4–40 usually biflorous nodes, often scattered along rachis;

primary bracts usually lanceolate, 2.5–7(–10) × 3–4 mm, 3–many-veined, ciliate, nectariferous.

0.8–11.5 cm.

to 30 cm.

3–7 mm, covered with minute uncinate hairs;

bracteoles persistent, linear to lanceolate, 1.5–1.8 mm.

arcuate or reflexed and thicker in fruit, 1–3.5(–5) mm, usually shorter than calyx, hairs straight and hooked;

bracteoles persistent, ovate to subulate, 0.5–1.5 mm, usually 1-veined, ciliate, sometimes along pedicels.

calyx campanulate, 3–4 mm, sparsely covered with incumbent and uncinate hairs;

abaxial and lateral lobes triangular to lanceolate;

adaxial lobes usually connate into apiculum;

corolla pink to lavender, violet, or purple, 10 mm;

banner suborbiculate, 7–8 mm, apex emarginate, rarely adaxial surface covered with straight hairs;

wings obovate to oblong, 10–12 mm, base slightly constricted, apex obtuse;

keel 6 mm;

ovary linear, 4 mm, covered with appressed hairs.

calyx campanulate, 1.5–3.5(–4.5) mm, inner surfaces of tube strigillose, outer surfaces usually hirtellous, especially on lower lobe;

abaxial and lateral lobes triangular, 0.5–1.2 mm, apex acute;

adaxial lobes connate, apex emarginate;

corolla pink, lilac, purple, or white, 10 mm;

banner obovate to orbiculate, 4–8 mm, apex emarginate, glabrous;

wings obovate, auriculiform, 0.5–1.4(–1.8) mm;

keel 5 mm;

ovary oblong, 2.5–5 mm, covered with hooked hairs or strigillose.

pendent, compressed, linear-falcate, 32–70 × 5–9 mm, elastically dehiscent, valves thin to papery, sparsely covered with appressed and uncinate hairs.

pendent, compressed, usually linear-falcate, 10–33 × 3–7 mm, elastically dehiscent, valves thin, sparsely covered with long, incumbent and hooked hairs or glabrate, sessile.

3–6(–10), brown to ivory, punctate and mottled with black, oblong, 3–6 × 2.5–5.5 mm, smooth to slightly rugose;

hilum ovate, 0.5–1.2 mm.

2–6, brown or gray mottled with black, oblong, orbicular, or reniform, 2–4.5 × 1.9–4.3 mm, smooth;

hilum ovate, 0.3 mm.

annual, with narrow, fibrous roots.

perennial, with short tuberous roots.

= 20.