Flora of North America species comparison

ascending to erect, (1–)2–6(–8.5) dm, hairs at base not stiff, not tubercle-based, glands sparse to abundant, conspicuous (to 1 mm, septate).

ascending to erect, 0.3–2 dm, lengths 2–3 times basal leaves.

ternate, (2–)4–12(–25) cm;

petiole (1–)2–8(–20) cm, long hairs sparse to common, spreading to ascending, 0.5–1.5(–3) mm, weak, crisped hairs usually absent, glands sparse to abundant, conspicuous (to 1 mm, septate);

leaflets 3, at tip of leaf axis, usually overlapping, largest ones mostly obovate or oval to nearly round, (0.5–)1–3(–4) × 0.3–3(–3.5) cm, distal 3/4 to ± whole margin evenly to unevenly incised 1/4–1/3(–1/2) to midvein, teeth 3–8(–13) per side, surfaces sparsely to moderately hairy, rarely glabrate, glands sparse to abundant at least abaxially.

not in ranks, ternate, 1–5(–9) cm;

stipules: apex acute to obtuse;

petiole 1–4 cm, long hairs absent or sparse to common, spreading to ascending, 0.5–2 mm, ± weak, glands sparse to abundant;

leaflets 3, central flabellate, 0.4–2 × 0.5–1.5 cm, petiolule 1–3 mm, margins flat, distal 3/4+ deeply 3–5-lobed (sinuses extending 1/2 to nearly to midvein), lobes unevenly incised 1/4–1/2 to midvein, teeth 2–5 per lobe, surfaces similar, dark green, hairs ± sparse, 0.5–1.5 mm, glands sparse to abundant.

(10–)20–70+-flowered.

1–7-flowered.

0.2–1(–2) cm.

straight, 0.2–1.2(–2) cm, not much longer in fruit than in flower.

epicalyx bractlets narrowly oblanceolate to narrowly obovate or elliptic, (1.5–)2–3.5(–4.5) × 0.5–1.5(–2) mm;

hypanthium (2–)3–4(–5.5) mm diam.;

sepals (2–)3–5 mm, apex broadly acute to obtuse;

petals pale yellow to yellow, broadly oblanceolate to obovate, (1–)2–2.7 × 1.5 mm;

stamens 10 or 15, filaments 0.5–1.2 mm, anthers 0.2–0.3 mm;

carpels 40–100, styles 0.5–0.7 mm.

epicalyx bractlets broadly ovate, 2–4 × 2 mm, margins flat;

hypanthium 3.5–6 mm diam.;

sepals 3–5 mm, apex broadly acute to obtuse;

petals yellow, 3–5.5 × 4–5 mm;

filaments 0.7–1.7 mm, anthers 0.5–0.6 mm;

carpels 25–40, styles tapered-filiform, ± papillate-swollen in proximal 1/5–/1/3, 1.3–2 mm.

whitish or pale yellowish, 0.5–0.9 mm, smooth, without a corky protuberance.

1–1.5 mm, dorsally crested.

= 42.