Flora of North America species comparison

climbing or trailing, to 150 cm.

stipules spreading to reflexed, ovate to triangular, often faintly lobed basally, 2.5–4 × 1–2 mm;

petiole 2–5 cm;

rachis 0.8–1.7 cm;

stipels narrowly triangular to lanceolate, 1–2.5 mm;

leaflet blades linear, narrowly oblong to lanceolate, or narrowly trullate, often lobed basally, 2.5–6 × 0.2–3 cm, thin to subcoriaceous, base truncate to broadly cuneate, apex usually obtuse or long-attenuate, surfaces covered with minute, uncinate hairs, also with incumbent hairs along veins abaxially and marginally.

to 20 cm, rarely with axillary flowers at base;

axis covered with uncinate hairs;

rachis 2–9 cm, with 2–6 biflorous nodes;

primary bracts ovate, 1–1.5 × 0.8 mm, 3–5-veined.

3–11 cm.

3–5(–7) mm, hairs uncinate;

bracteoles persistent, ovate to lanceolate or oblong, 1–1.5 mm, often densely covered with incumbent hairs, often at midpoint of pedicel.

calyx campanulate, 2.5–3.5 mm, sparsely to densely covered with uncinate hairs, veins prominent;

abaxial lobes triangular to narrowly so, apex acute, 1–1.5 mm;

lateral lobes triangular, apex acute, 1 × 1 mm;

adaxial lobes connate, apex emarginate or cleft;

corolla pink to light purple, 12 mm;

banner oblong to orbiculate, 1 mm, apex slightly emarginate;

wings obovate, 12 mm;

keel 5.5 mm;

ovary linear, 3.5 mm, sparsely covered with appressed hairs.

pendent, compressed, linear-falcate, 23–30 × 4–8 mm, elastically dehiscent, valves thin, sparsely covered with minute, appressed hairs.

3 or 4, brown often mottled with black, oblong, 3.5–5 × 3–4 mm, rugose, reticulate-areolate patterns with rounded mounds;

hilum ovate, 0.5 mm.

perennial, often forming dense growth, with thick and elongate tuberous, woody taproots.

= 22.