Flora of North America species comparison

slender, 0.8-1.4 mm thick.

erect from large caudices, 9-25 cm, glabrous, each with 1-3 flowers.

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.

persistent, blades circular to reniform in outline, 2-3x-dissected into linear segments, 0.9-2.5 × 1.1-2.8 cm, base obtuse, margins entire, apices of segments narrowly rounded to acute.

pedicels glabrous;

receptacle glabrous;

sepals 4-11 × 3-7 mm, abaxially sparsely pilose, hairs colorless;

petals 5-10, 8-15 × 8-19 mm;

nectary scale glabrous.

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.

ovoid, 6-12 × 5-9 mm;

achenes 1.8-2.4 × 1-1.4 mm, glabrous or nearly so;

beak subulate, straight, 1.2-1.7 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.

n = 16.

= 32.