Flora of North America species comparison

never tuberous.

not thickened basally, glabrous.

erect, never rooting nodally, hispid, base not bulbous.

erect or ascending, often rooting at proximal nodes, glabrous or sparsely pilose.

blades broadly cordate in outline, 3-foliolate, 1.6-7 × 3-9 cm, leaflets cleft, usually deeply so, ultimate segments narrowly elliptic, margins toothed, apex acute.

ovate to lanceolate or narrowly elliptic, 1.5-5.7 × 0.4-2.4 cm, base cordate to acute, margins finely denticulate or entire, apex broadly rounded to acuminate.

bracts linear to lanceolate or oblanceolate.

receptacle hirsute;

sepals reflexed ca. 1 mm above base, 3-5 × 1.5-2 mm, ± hispid;

petals 5, yellow, 2-4 × 1-2.5 mm.

receptacle glabrous;

sepals 4-5, spreading or reflexed from base, 2-3 × 1.5-3 mm, glabrous or pubescent;

petals 4-6, 2-6 × 1-2 mm;

nectary scales glabrous.

cylindric, 9-12 × 5-7 mm;

achenes 1.8-2.8 × 1.6-2 mm, glabrous, margin forming narrow rib 0.1-0.2 mm wide;

beak persistent, broadly lanceolate or nearly deltate, straight or nearly so, 0.6-0.8 mm.

hemispheric to ovoid, 2-4 × 2-3 mm;

achenes 0.8-1 × 0.8 mm, glabrous;

beak deciduous, leaving stump 0.1-0.2 mm.

= 16.