Flora of North America species comparison

initially erect to ascending to 5 dm, then arching above ground-level, becoming prostrate, flagelliform, not branched, rooting at distal nodes, (0.5–)1.5–12 dm.

erect, 1–3 dm.

persistent or ephemeral, usually palmate, 3.5–20 cm;

petiole 1–15 cm, long hairs ± abundant, appressed to spreading, (0.5–)1–3 mm, weak to ± stiff, glands absent or sparse, sometimes common;

leaflets 5(–7), central narrowly elliptic to obovate, 1.5–5 × 0.5–2.5 cm, distal 1/2–3/4 of margin incised 1/4–1/3 to midvein, teeth 4–8(–13) per side, surfaces similar to ± dissimilar, abaxial green to silvery white, sparsely to abundantly hairy, adaxial green, glabrate or sparsely to moderately hairy.

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.

(0–)1 proximal to 1st flowering node, well expanded at anthesis, usually palmate, 2.5–6(–9) cm;

petiole 0–2(–4) cm;

leaflets (3–)5, often more elongate than those of basal leaves, ± elliptic to oblanceolate, sometimes obovate, 1.5–6(–7.5) × 0.5–2(–3) cm, apex acute to obtuse.

1–2.

solitary flowers at stolon nodes.

2–5-flowered, very open.

1–5(–8.5) cm.

2–4 cm.

5(–6)-merous;

epicalyx bractlets linear to narrowly lanceolate, 2–5 × 1–1.5(–2) mm, often larger than sepals (especially in bud);

hypanthium 3–5 mm diam.;

sepals 4–6 mm, apex broadly acute;

petals 4–7 × 3–6 mm, apex rounded to ± retuse;

stamens ca. 20, filaments 0.5–2 mm, anthers 0.6–1 mm;

carpels 20–50, styles 0.8–1.5 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.

0.9–1.2 mm, faintly rugose.

1.4–1.6 mm, smooth to faintly rugose.

horizontal, irregularly thickened or moniliform, 1–8 cm.

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