Flora of North America species comparison

slender, 0.2-0.8 mm thick.

erect or ascending, 5-19 cm, sparsely pilose, each with 1-4 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 reniform or semicircular, undivided or some 3-parted, 1.4-2.1 × 1.7-2.8 cm, base cordate or truncate, margins crenate with more than 5 crenae, apex rounded.

pedicels pilose, sometimes sparsely so;

receptacle hispid;

sepals 4-6 × 2-3 mm, abaxially pilose, hairs colorless;

petals 5, 4-5 × 2-4 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 to cylindric, 4-7 × 4-6 mm;

achenes 1.6-1.8 × 1.2-1.4 mm, glabrous;

beak lance-subulate, curved, 0.4-0.6 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.

= 32.