Flora of North America species comparison

never tuberous.

erect or decumbent, sometimes rooting nodally, hispid or strigose, base not bulbous.

floating or prostrate, glabrous, rooting at proximal nodes.

basal leaves seldom present, cauline leaf blades semicircular to reniform, 1-6x-lobed, parted, or dissected 1.2-7.3 × 1.9-10.8 cm, base truncate or cordate, segment margins entire or crenate, apex rounded to filiform.

blades ovate to deltate in outline, 3-foliolate or outer blades merely 3-parted, 2-13.4 × 2.4-16.8 cm, leaflets undivided to lobed or parted, ultimate segments narrowly elliptic or oblanceolate to circular, margins toothed, apex acuminate to rounded.

receptacle hispid;

sepals spreading or reflexed, 4-10 × 2-5 mm, hispid;

petals 5, yellow, 8-16 × 3-9 mm.

receptacle sparsely hispid;

sepals 5, spreading or weakly reflexed, 5-7 × 3-6 mm, glabrous;

petals 5-6(-14), 7-12 × 5-9 mm;

nectary scale variable, crescent-shaped, funnel-shaped, or flaplike;

style 0.8-1.2 mm.

hemispheric to short-ovoid, 6-10 × 7-10 mm;

achenes 2.2-5.2 × 2-3.8 mm, glabrous, margin forming narrow rib or broad wing 0.1-1.2 mm wide;

beak persistent, lance-subulate, straight or somewhat curved, 0.8-2.6 mm.

ovoid, 8-10 × 7-8 mm;

achenes 1.8-2.2 × 1.6-2.2 mm, glabrous;

beak lanceolate, straight, 1-1.8 mm.

= 32.