Flora of North America species comparison

prostrate to ascending, sometimes erect, (1–)2–4(–6) dm, hairs at base not particularly stiff, not tubercle-based, glands absent or sparse, inconspicuous.

pinnate (with distal leaflets ± confluent), 5–12(–15) cm;

petiole 1–6(–8) cm, long hairs sparse to common, ± ascending, sometimes erect or appressed, 0.5–1(–1.5) mm, usually ± weak, crisped hairs absent or sparse to common, glands sparse to common, inconspicuous;

leaflets 5–9, on distal (1/4–)1/2–2/3 of leaf axis, ± separate, largest ones oblanceolate to elliptic or obovate, 1–2(–4) × 0.6–1.2(–2.5) cm, distal 2/3 to ± whole margin ± evenly incised 1/4–1/2 to midvein, teeth (2–)4–6 per side, surfaces glabrate or sparsely hairy, glands mostly absent.

(10–)20–100+-flowered.

0.5–2(–2.5) cm.

epicalyx bractlets ± elliptic to narrowly ovate, 3–5(–7) × 1–2(–3) mm;

hypanthium 3–5 mm diam.;

sepals 3–5(–6) mm, apex acute to apiculate;

petals yellow, obovate, 2.5–5 × 2–4.5 mm;

stamens 20(–25), filaments 0.7–1.8(–2) mm, anthers 0.3–0.5 mm;

carpels ca. 100, styles 0.5–0.6 mm.

brown, 0.7–1.3 mm, usually strongly rugose, developing a smooth, corky protuberance on ventral suture, often as large as body of achene.

= 28.