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).

decumbent to ascending, sometimes prostrate, 0.6–2.2 dm, lengths 1.5–3 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.

pinnate with distal leaflets ± distinct, 4–10 × 1–2(–3) cm;

petiole 1–3 cm, straight hairs dense, ± appressed, 1–2 mm, stiff, cottony hairs absent, glands absent or sparse;

primary lateral leaflets 5–7(–9) per side (sometimes with additional interspersed leaflets), on distal (1/2–)2/3–3/4 of leaf axis, ± overlapping, largest ones oblanceolate- to obovate-oblong, 0.5–1.5 × 0.4–0.8 cm, distal 3/4 to whole margin pinnately incised nearly to midvein, teeth (5–)7–9, linear-oblanceolate, 2–6 × 0.5–1 mm, apical tufts 1 mm, surfaces grayish green, straight hairs sparse (adaxially) to common, ± appressed, 1–2 mm, stiff, cottony hairs absent, glands absent or obscured.

(1–)2–3(–4).

(10–)20–70+-flowered.

3–15-flowered, ± compactly cymose, opening in fruit.

0.2–1(–2) cm.

0.7–2(–2.5) cm, straight 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 narrowly elliptic, sometimes doubled, 2–3.5 × 1–1.5 mm;

hypanthium 3–4 mm diam.;

sepals 4–6 mm, apex ± acute;

petals 4–5(–6) × 3–4(–5.5) mm;

filaments 1–2 mm, anthers 1–1.5 mm, often as long as filaments;

carpels 8–20, styles 2 mm.

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

1.8 mm, ± smooth, not carunculate.