Flora of North America species comparison

erect to ascending, branched.

procumbent or erect, branched.

pinnate;

stipules ovate-lanceolate, 0.5–0.8 cm, margins entire, glandular, apex acuminate;

petiole 0.3–2 cm;

lateral leaflet petiolules 0.5–0.6 mm, terminal leaflet stalk 3–5 mm;

leaflets 3, blades rhombic to obovate, 0.4–1.5 × 0.4–0.8 cm, base cuneate, lateral veins prominent, ± parallel, ascending, margins denticulate distally, apex truncate or retuse, surfaces strigose adaxially.

palmate;

stipules ovate, 0.3–0.5 cm, margins entire, apex acuminate-subulate;

petiole 1–6 cm;

petiolules to 0.5 mm;

leaflets 3, blades obovate or obcordate, 0.3–0.8 × 0.2–0.6 cm, base cuneate, veins prominent adaxially, margins finely toothed, apex truncate or retuse, surfaces glabrous or sparsely hairy.

axillary, 30–60-flowered, globose or broadly ovoid, 0.8–1.5 × 0.7–1 cm;

involucres absent.

axillary, 10–20-flowered, dense, globose, 0.5–0.8 × 0.5–0.8 cm;

involucres absent, stipules forming involucrelike structures, overtopping inflorescences.

1.5–3.5 cm.

essentially absent.

reflexed, 0.7–1.2 mm;

bracteoles a fringe of red setae.

straight, 0.1 mm;

bracteoles triangular, membranous, 0.5–1.2 mm, apiculate.

4.3–5 mm;

calyx campanulate, strongly bilabiate, 1.3–1.5 mm, glabrous, veins 5, tube 0.3–0.6 mm, lobes unequal, adaxial deltate, very short, lateral and abaxial linear-subulate, each tipped with 1 or 2 stiff hairs, orifice open;

corolla yellow becoming brown, 3.5–6 mm, ribbed, banner persistent, obovate, enveloping other petals, boat-shaped, 4.3–5 × 2.8–3.2 mm, apex broad, acute.

3–5 mm;

calyx tubular, 3–5 mm, slightly hairy or glabrous, veins 10, tube 2–3 mm, lobes subequal, lanceolate, curved in fruit, orifice open;

corolla white, 2.5–3.5 mm, banner obovate, 2.5–3.5 × 1 mm, apex acute.

stipitate, oblong, 2–2.5 mm.

ovoid-ellipsoid, 3–5 mm.

1 or 2, yellow, ellipsoid, 1–1.5 mm, smooth, lustrous.

2, yellow, lenticular or reniform, 0.8–1 mm, minutely papillate.

= 14.

= 16.