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, (0.4–)1–2 dm, lengths 2–4 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–)2–5(–7) cm;

stipules: apex acute to rounded;

petiole 1–4 cm, hairs absent or long hairs sparse to common, appressed, 0.5–1 mm, stiff, glands absent;

leaflets 3, central obovate to flabellate, 1–2.5 × 0.5–2 cm, petiolule (1–)3–10 mm, margins flat, not lobed, distal 1/2–3/4 ± evenly incised 1/4–1/2 to midvein, teeth (2–)3(–4) per side, not secondarily toothed, surfaces similar, green, sometimes ±glaucous, hairs absent or sparse to common, 0.5 mm, glands absent.

(10–)20–70+-flowered.

1–6-flowered.

0.2–1(–2) cm.

straight, 0.5–2 cm in flower, to 5 cm in fruit.

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 elliptic to oval, 2–4.5 × 1–2 mm, margins flat;

hypanthium 2.5–4 mm diam.;

sepals 3–5.5 mm, apex acute to obtuse;

petals yellow, 4–7 × 4–6 mm;

filaments 1–3 mm, anthers 0.5–0.9 mm;

carpels 10–30, styles filiform, not or slightly papillate-swollen proximally, 1–2.5 mm.

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

1.2–1.5 mm.