Flora of North America species comparison

ascending to erect, 0.1–0.5(–0.7) dm, lengths 1–2 times basal leaves.

ascending to erect, (0.3–)1–3 dm, lengths 2 times basal leaves.

not in ranks, ternate, 1–5 cm;

stipules: apex acute;

petiole 0.5–3.5 cm, long hairs sparse to abundant, ascending to spreading, 0.5–2 mm, ± soft, glands sparse to common;

leaflets 3, central obovate, 0.5–2 × 0.5–1 cm, petiolule 0–1 mm, margins revolute, not lobed, distal 1/2–2/3 evenly incised ± 1/2 to midvein, teeth 3–4(–6) per side, surfaces ± similar, green (paler abaxially), hairs sparse to abundant, 0.8–1.2 mm, glands sparse to common.

2-ranked, ternate, (1–)3–12(–20) cm;

stipules: apex rounded;

petiole (0.5–)1–15(–18) cm, hairs and glands usually absent;

leaflets 3, central widely obovate to flabellate, (0.5–)1–5 × (0.4–)1–3(–3.5) cm, petiolule 0–5(–10) mm, margins flat, not or shallowly lobed (sinuses extending less than 1/2 to midvein), distal 1/2–3/4 usually unevenly incised 1/4–1/2 to midvein, teeth 3–7 per side, often secondarily toothed, surfaces similar, green, hairs absent or sparse, rarely common, 0.5–1 mm, glands absent or sparse.

1(–2)-flowered.

1–6-flowered.

straight, 0.2–1.5 cm in flower, to 5 cm in fruit.

straight, 0.3–4.5(–5) cm, not much longer in fruit than in flower.

epicalyx bractlets oblong or ovate, 2.5–5 × 1.5–3.5 mm, margins revolute;

hypanthium 3–3.5 mm diam.;

sepals 2.5–5 mm, apex ± acute;

petals pale yellow, 4–8 × 4–6 mm;

filaments 1.2–2 mm, anthers 0.3–0.4 mm;

carpels 40–50, styles ± columnar, not or scarcely papillate-swollen proximally, 0.8–1.2 mm.

epicalyx bractlets often toothed or 2-lobed, elliptic to oval, 3.5–7 × (1–)1.5–3 mm, margins flat;

hypanthium 3–7 mm diam.;

sepals 4–8 mm, apex acute to obtuse;

petals dark yellow, (5–)6–10(–12) × (3–)5–10 mm;

filaments 1.5–3 mm, anthers 0.6–1.5 mm;

carpels 20–50, styles filiform, not or slightly papillate-swollen proximally, 1.6–2.5 mm.

1.4–1.6 mm.

1.2–1.5 mm.

= 28.