Flora of North America species comparison

mostly decumbent to ascending, 1–6 dm.

erect, 1–3 dm.

palmate.

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.

2–9, proximal ones 2–7(–10) cm;

proximal petioles 1–4(–7) cm, long hairs absent or sparse, ± ascending, 1–2 mm, soft, short and crisped hairs absent or obscured, cottony hairs dense, glands absent or obscured;

leaflets 5(–7), central one ± oblanceolate, (0.5–)1–3 × 0.3–1(–1.3) cm, margins revolute, distal 1/2–2/3 evenly or unevenly incised 1/2–3/4+ to midvein, teeth 2–3 per side (more if lobed or secondarily toothed), surfaces strongly dissimilar, abaxial white, long hairs ± sparse (mostly on veins), 1–2 mm, weak, short and crisped hairs absent or obscured, cottony hairs dense, glands absent or obscured, adaxial long hairs absent or sparse to common, short or crisped hairs absent or sparse, cottony hairs absent, glands absent or sparse.

1–2.

10–80-flowered.

2–5-flowered, very open.

0.3–1.5(–2) cm.

2–4 cm.

epicalyx bractlets oblong to narrowly ovate, 1.5–3 × 0.7–1.2 mm, lengths 2/3–1 times sepals;

sepals 2–4.5 mm, apex ± acute;

petals (2–)2.5–4 × 1.5–3 mm;

filaments 0.8–1.5 mm, anthers 0.3–0.6(–0.8) mm;

carpels 30–60, styles 0.6–0.9 mm, often strongly papillate-swollen proximally.

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.

0.8–1.1 mm, smooth to lightly rugose.

1.4–1.6 mm, smooth to faintly rugose.

= 14, 28, 35, 42, 56, 62 (Eurasia).

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