Flora of North America species comparison

not thickened basally, canescent.

floating or prostrate, glabrous, rooting at proximal nodes.

erect or ascending, not rooting nodally, glabrous.

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.

narrowly elliptic to linear, 2.5-4.8 × 0.2-0.9 cm, base narrowly acuminate, margins entire, apex acute to acuminate.

bracts lanceolate to linear.

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, 3-5 × 1-2 mm, glabrous;

petals 5, 4-6 × 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, 2-4 × 3-5 mm;

achenes 1-1.4 × 0.8 mm, glabrous;

beak subulate, straight, 0.2-0.4 mm.

= 32.