Flora of North America species comparison

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

erect, 1–3 dm.

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.

pinnate, (4–)5–10(–14) cm;

petiole 3–7(–10) cm, long hairs abundant, subappresssed to appressed, 0.5–2 mm, ± weak, short hairs absent, crisped or cottony hairs absent or sparse, glands absent or sparse;

leaflets 2–3 per side, on distal 1/3–1/2 of leaf axis, separate, terminal ones elliptic to obovate, (1.8–)2–2.5(–3) × 0.8–1.3 cm, margins revolute, incised nearly to midvein, undivided medial blade 1–2 mm wide, teeth (4–)5–7 per side, linear, surfaces ± dissimilar, abaxial grayish to white, long hairs ± abundant especially on veins, 1–1.5 mm, weak, short hairs absent, crisped hairs abundant to dense, glands absent or obscured, adaxial greenish gray, long hairs common, appressed, 0.5–1 mm, short hairs absent, crisped hairs absent or sparse, glands absent or obscured.

1–2(–3).

1–2.

10–30-flowered.

2–5-flowered, very open.

0.3–3(–5) cm.

2–4 cm.

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.

epicalyx bractlets narrowly elliptic to linear, 3–4 × 0.5–0.8(–1) mm, lengths 2/3–3/4 times sepals, margins flat;

hypanthium 2.5–3 mm diam.;

sepals 3.5–5 mm, apex subacute, abaxial surfaces: venation indistinct, glands sparse to common, often obscured;

petals yellow, 7.5–10(–10.5) × 7.5–9(–10) mm, much exceeding sepals;

filaments 1–2 mm, anthers 0.5–0.7 mm;

carpels 50–60, styles papillate-swollen at very base, if at all, 0.8–0.9 mm.

1.4–1.8 mm, smooth to faintly rugose.

1.4–1.6 mm, smooth to faintly rugose.

= 42, 70, 77, 84, 98.

= 28 (14, 42, 56) (Russian Far East).