Flora of North America species comparison

ascending to erect, (1–)1.5–5 dm.

mostly ascending to erect, not flagelliform, openly branched, not rooting at nodes, (0.5–)1–5(–7) dm.

palmate.

ephemeral, usually ternate, 2–15 cm;

petiole (1–)3–13 cm, long hairs sparse to common, appressed, 0.5–1 mm, stiff, glands absent;

leaflets 3(–5), central ± obovate to cuneate, (0.5–)1–2 × (0.3–)1–1.5 cm, distal 1/2–2/3 of margin incised ± 1/3 to midvein, teeth 2–4 per side, surfaces similar, green (abaxial sometimes paler), glabrate or sparsely to moderately hairy.

3–9, proximal ones 5–10(–14) cm;

proximal petioles 2–6(–8) cm, long hairs sparse to common, spreading to loosely appressed, 1.5–3 mm, soft to weak, short or crisped hairs abundant, cottony hairs mostly absent, glands sparse to common, usually obscured;

leaflets 5–7, central one usually ± oblanceolate, (1.5–)2–5 × 0.5–1.5 cm, margins flat or ± revolute, distal (1/2–)3/4+ usually evenly incised 1/2 to midvein, teeth 4–6(–10) per side, surfaces ± dissimilar, abaxial grayish to gray-green, long hairs sparse to common (especially on veins), 1–2.5 mm, soft to weak, short or crisped hairs ± abundant, sometimes sparse, cottony hairs absent, glands ± sparse (usually obscured), adaxial long hairs usually sparse, sometimes absent, 1–2 mm, short hairs absent or sparse, crisped and cottony hairs absent, glands absent or sparse.

(0–)1–3(–7) proximal to 1st flowering node, expanded at anthesis, usually ternate, rarely palmate (or appearing so because of leafletlike stipules), (0.5–)1–3 cm;

petiole usually 0 cm;

leaflets 3(–5), usually much narrower than those of basal leaves, narrowly cuneate to oblanceolate, (0.5–)1–3 × (0.2–)0.5–1 cm, distal 1/3–2/3 of margin incised ± 1/2 to midvein, teeth 2–4(–6) per side, apex usually obtuse to acute.

10–50+-flowered.

3–30-flowered, cymose, open.

0.3–1.5(–3) cm.

(1–)2–3(–5) cm.

epicalyx bractlets lanceolate or elliptic to oblong, 3–6 × 1–1.5 mm, length ± 1 times sepals;

sepals 3.5–6.5 mm, apex acute to acuminate;

petals 4–7(–8) × 4–5(–6) mm;

filaments 0.8–2.5 mm, anthers (0.5–)0.8–1.2 mm;

carpels 80–100+, styles 0.8–1.1 mm, scarcely papillate-swollen proximally.

4(–5)-merous;

epicalyx bractlets ovate to narrowly elliptic, 1.5–4 × 0.5–1 mm, much smaller than to sometimes equal to sepals;

hypanthium 1.5–2.5 mm diam.;

sepals (2–)3–5 mm, apex broadly acute;

petals (2–)4–6 × (1.5–)3–6 mm, apex ± retuse;

stamens 15–20, filaments 2–3.8 mm, anthers 0.4–0.6 mm;

carpels 4–8(–20), styles 0.9–1.4 mm.

1 mm, lightly rugose.

1.2–2 mm, rugose.

erect to horizontal, irregularly thickened, 1–8 cm.

= 14, 28, 35, 42, 84 (Eurasia).

= 28 (Eurasia).