Flora of North America species comparison

0.4–1.7 dm.

(0.3–)2–4(–5) dm, lengths (1–)2–4 times basal leaves.

ternate, (1.5–)2–6(–8) cm;

petiole 0.8–5(–7) cm, long hairs sparse to abundant, usually ± spreading, sometimes ascending, 0.5–1 mm, weak to ± stiff, glands sparse to common;

leaflets 3, central obovate-cuneate, (0.2–)0.5–1(–1.5) × 0.2–1 cm, scarcely petiolulate, distal 1/2–2/3 of margins evenly incised 1/3–1/2 to midvein, teeth (1–)2–3(–4) per side, surfaces green, long hairs sparse to common, 0.5–1 mm, glands sparse to abundant.

pinnate to subpinnate, (3–)5–15(–25) cm;

petiole 1–10(–15) cm, long hairs abundant to dense, tightly appressed, 1–2.5 mm, stiff, short hairs absent or obscured, crisped-cottony hairs absent or sparse to common, glands absent or obscured;

leaflets not conduplicate, lateral ones evenly (to unevenly in argyrea phase) paired, (2–)3–6(–7) per side on distal (1/6–)1/5–1/2 of leaf axis, distal pairs ± decurrent, often confluent with terminal leaflet, larger leaflets oblanceolate or narrowly obovate to oblong, 1–5(–6) × 0.3–1.5 cm, distal (2/3–)3/4 to whole margin incised 1/2 or less (rarely more) to midvein, teeth (5–)7–12(–18) per side, 1–4 mm, surfaces ± to strongly dissimilar, abaxial white, long hairs abundant (mostly on, but not limited to, veins), 1–2 mm, stiff, short hairs absent or obscured, crisped-cottony hairs abundant to dense, glands absent or obscured, adaxial green to grayish, long hairs sparse to common, rarely absent, short or crisped to, sometimes, cottony hairs absent or sparse to common, glands sparse.

1–2(–3).

1–4-flowered.

10–30-flowered.

0.5–2(–4) cm.

0.3–3(–5) cm.

epicalyx bractlets sometimes paired, narrowly elliptic, 1.5–2(–2.5) × 0.5–1 mm 1/2–3/4 as long as sepals;

hypanthium 2–3 mm diam.;

sepals 2.5–4 mm, apex broadly acute;

petals ± paler abaxially, bright yellow adaxially, ± obcordate to broadly obovate, (2–)3–4 × 2–3 mm;

filaments 1–1.5 mm, anthers 0.3–0.5 mm;

carpels 10–25, styles 1–1.5 mm.

epicalyx bractlets narrowly elliptic to lanceolate, rarely linear, 2–5 × 0.5–1.5 mm, (1/2–)2/3 as long as sepals, abaxial vestiture similar to or ± sparser than sepals, usually not glabrescent, straight hairs ± abundant, crisped to sometimes ± cottony hairs absent or sparse to abundant;

hypanthium 3–7 mm diam.;

sepals 4–5.5(–6.5) mm, apex acute to acuminate;

petals 4–8 × 4–7 mm;

filaments 0.5–2.5 mm, anthers 0.6–1.1 mm;

carpels (5–)10–30, styles 1.7–2.5 mm.

1.3 mm, smooth to lightly rugose.

1.4–1.8 mm, smooth to faintly rugose.

hairs not well differentiated from long hairs, absent or sparse throughout.

= 42, 70, 77, 84, 98.