Flora of North America species comparison

erect to prostrate, branched from base.

erect or ascending, cespitose, much-branched.

pinnate;

stipules ovate, 0.3–0.5 cm, margins entire, apex acute;

petiole to 1.5 cm;

lateral leaflet petiolules to 0.5 mm, terminal leaflet stalk 1–1.5 mm;

leaflets 3, blades obovate to elliptic-lanceolate, 1–2 × 0.5–1.5 cm, base cuneate, lateral veins prominent, ± parallel, ascending, margins dentate distally, apex rounded or retuse, surfaces glabrous or sparsely hairy.

palmate;

stipules oblanceolate, 0.5–1.4 cm, margins entire, apex acute-acuminate;

petiole 0.5–4 cm;

petiolules to 0.1 mm;

leaflets 3, blades oblanceolate, often folded, 0.4–1.5 × 0.2–0.4 cm, base cuneate, veins obscure, margins subentire to denticulate distally, apex acute, mucronulate, surfaces villous.

axillary or terminal, 5–20-flowered, ovoid or globose, 0.5–0.9 × 0.6 cm;

involucres absent.

terminal, usually formed of 2 sessile heads, 15–25-flowered, globose, 0.8–2 × 0.6–1.5 cm;

involucres absent, distal stipules and leaves sometimes forming involucrelike structure.

1–1.5 cm.

between distal leaves or involucrelike structure and inflorescences 0.5–6 cm.

reflexed, 0.2–0.5 mm;

bracteoles a fringe of red setae.

straight, (0–)1–2 mm;

bracteoles broadly ovate, truncate, membranous, to 0.5 mm.

2.8–3.5 mm;

calyx campanulate, 1.5–2 mm, glabrous, veins 5, tube 0.8–1 mm, lobes unequal, longer than tube, adaxial 2 shorter, orifice open;

corolla pale yellow becoming brown, 2.6–3.2 mm, not or slightly ribbed, banner persistent, spatulate, 2.6–3.2 × 2 mm, apex rounded to broadly acute.

10–15 mm;

calyx tubular-campanulate, 6–9 mm, rough-hairy or glabrous, veins 10, tube 3–6 mm, lobes subequal, subulate, orifice open;

corolla light purple, 10–15 mm, banner oblong, 9–13 × 3–4 mm, apex rounded or truncate;

ovaries pubescent distally.

stipitate, ellipsoid, 1.5–2 mm, short beaked.

ellipsoid, 4–5 mm.

1, yellow or pale brown, ellipsoid, 0.9–1 mm, smooth, glossy.

1 or 2, brown, ovoid, 1.5–2 mm, smooth.

= 16, 28, 32.