Flora of North America species comparison

slender or fusiform-thickened basally, glabrous.

erect or ascending, not rooting nodally, glabrous or hirsute.

prostrate or sometimes floating, glabrous or hirsute, rooting nodally.

basal leaf blades with base acute;

proximal cauline leaf blades lanceolate, ovate, or elliptic, 1.8-14.1 × 0.7-2.9 cm, base acuminate to rounded, margins entire or serrulate, apex obtuse to acuminate.

basal leaves absent, cauline leaf blades reniform to circular, 3-parted, 0.6-6.5 × 1.1-9 cm, base cordate, segments again 1-3x-lobed to -dissected, margins entire or crenate, apex rounded to filiform.

bracts lanceolate.

receptacle glabrous;

sepals 5, spreading or reflexed from base, 2-6 × 1-4 mm, glabrous or hirsute;

petals 5-12, 5-14 × 2-8 mm;

nectary scales glabrous.

receptacle sparsely hispid;

sepals 4-5, spreading or reflexed from base, 2-5 × 2-4 mm, glabrous or sparsely pilose;

petals 4-14, 3-7 × 2-5 mm;

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

style 0.2-0.4 mm.

hemispheric to globose, 3-7 × 4-8 mm;

achenes 1.6-2.8 × 1.2-2 mm, glabrous or rarely hispid;

beak lance-subulate, straight or weakly curved, 0.4-1.2 mm.

globose or ovoid, 3-8 × 3-7 mm;

achenes 1-1.6 × 1-1.2 mm, glabrous;

beak narrowly lanceolate or filiform, 0.4-0.8 mm.

= 16, 32, 64.