Flora of North America species comparison

never tuberous.

not thickened basally, glabrous.

erect or ascending, never rooting nodally, crisped-pilose, base not bulbous.

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

broadly rhombic to semicircular in outline, 3-parted, 2.8-4.3 × 3-5.5 cm, segments 3-lobed, ultimate segments lanceolate, margins entire or toothed, apex narrowly acute or acuminate.

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 glabrous;

sepals reflexed 1 mm above base, 4-6 × 1.5-3 mm, densely pilose;

petals 5, abaxially red, adaxially yellow, 10-12 × 4-6 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.

of achenes hemispheric, 4-7 × 7-10 mm;

achenes 3.4-4.2 × 2.8-3.2 mm, sometimes basally pilose, margin forming narrow rib 0.1-0.2 mm wide;

beak persistent, lance-subulate, straight or somewhat curved distally, 1.6-2.6 mm.

of achenes 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.