Flora of North America species comparison

not thickened basally, glabrous.

floating or prostrate, glabrous, rooting at proximal nodes.

erect to prostrate, usually rooting nodally, glabrous or strigose.

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.

ovate to broadly ovate, 0.8-2.7 × 0.8-1.9 cm, base rounded to weakly cordate, margins entire or dentate, apex rounded or obtuse.

bracts lanceolate to oblanceolate or sometimes ovate.

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.

receptacle glabrous;

sepals 5, spreading or reflexed from base, 1.5-3 × 1-2 mm, glabrous;

petals 5-6, 3-5 × 1-2 mm;

nectary scales glabrous.

ovoid, 8-10 × 7-8 mm;

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

beak lanceolate, straight, 1-1.8 mm.

hemispheric or globose, 2-4 × 3-4 mm;

achenes 1.2-1.4 × 1-1.2 mm, glabrous;

beak lanceolate to lance-filiform, straight or curved, 0.4-1 mm.

= 32.