Flora of North America species comparison

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

ascending, 0.1–1.5(–2) dm.

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.

subpinnate, 1.5–9 cm;

petiole 0.7–4 cm, long hairs common to dense, ± appressed to ascending, 0.5–3 mm, soft, short hairs absent, crisped hairs sparse to abundant, glands absent or sparse;

leaflets (1–)2(–3) per side, on distal 1/6–1/2 of leaf axis, separate to overlapping, terminal ones oblong or obovate, 0.4–3 × 0.2–1.2 cm, margins revolute, incised 2/3–3/4+ to midvein, undivided medial blade 2–6 mm wide, teeth 2–5 per side, linear to narrowly oblong, surfaces dissimilar, abaxial white, long hairs ± abundant, 1–2 mm, soft, short hairs absent or obscured, crisped and/or cottony hairs dense, glands absent or obscured, adaxial grayish white to dark grayish green, long hairs sparse to dense, loosely appressed to spreading, 0.5–2 mm, short hairs absent, crisped hairs absent or sparse, glands absent.

1–2.

1–6-flowered.

(1–)2–5(–9)-flowered, ± open.

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

0.5–1 cm (proximal to 5 cm).

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.

epicalyx bractlets oblong to ovate, 2–4(–6) × 0.8–1.3(–2) mm, lengths ± 3/4 times sepals, margins sometimes revolute;

hypanthium 2.5–4 mm diam.;

sepals 3–5 mm, apex obtuse to subacute, abaxial surfaces: venation indistinct, glands ± abundant, often obscured;

petals pale yellow, 4–5 × 2–3 mm, lengths 1.5 times sepals;

filaments 1–1.5 mm, anthers 0.4 mm;

carpels 30–60, styles papillate-swollen in proximal 1/4–1/3, 0.9–1.2 mm.

1.2–1.5 mm.

1.4–1.5 mm, smooth or rugose.

= 28.

= 28.