Flora of North America species comparison

erect-ascending, simple or cespitose, branched or unbranched.

palmate;

stipules ovate-lanceolate, 0.8–2 cm, margins toothed, apex rounded to acute;

petiole 1–9 cm;

petiolules 0.5 mm;

leaflets 3, blades elliptic to obovate, 0.5–3.2 × 0.4–1.5 cm, base cuneate, veins fine to slightly thickened, margins usually serrulate, rarely nearly lobed, teeth shortly aristate, apex usually acute or obtuse, rarely emarginate, surfaces glabrous.

axillary or terminal, 10–30-flowered, subglobose, 1.2–3 × 1.2–3 cm;

involucres widely campanulate to nearly flat, 6–11 mm.

2–15 cm.

straight, 0.5 mm;

bracteoles absent.

10–16 mm;

calyx campanulate, inflated in fruit, 7–9 mm, sparsely pubescent, veins 5, tube 3.5–4.5 mm, lobes unequal, abaxial and lateral 2- or 3-fid, adaxial unbranched, segments plumose, apex setaceous, orifice open;

corolla yellow, 10–15 mm, banner broadly ovate, proximally inflated in fruit, distally narrowed into twisted tip, 10–15 × 3–5 mm, apex obtuse, truncate, or emarginate-apiculate.

stipitate, ovoid, 3.3–3.5 mm.

1 or 2, dark brown, ellipsoid to mitten-shaped, 3.1–3.4 mm, rugose.