Flora of North America species comparison

never tuberous.

never tuberous, sometimes thick and ± fleshy proximally.

erect or decumbent, sometimes rooting nodally, hispid or strigose, base not bulbous.

erect, not rooting nodally, hirsute or strigose, base not bulbous.

blades ovate to deltate in outline, 3-foliolate or outer blades merely 3-parted, 2-13.4 × 2.4-16.8 cm, leaflets undivided to lobed or parted, ultimate segments narrowly elliptic or oblanceolate to circular, margins toothed, apex acuminate to rounded.

blades broadly ovate to cordate or sometimes reniform in outline, deeply 3-divided or occasionally 3-foliolate, 2.2-6 × 2.5-7.7(-10) cm, divisions 1-2x deeply parted or -dissected, ultimate segments linear to broadly linear, margins entire (occasionally a lobe reduced to large tooth), apex acute or rounded-acute.

receptacle hispid;

sepals spreading or reflexed, 4-10 × 2-5 mm, hispid;

petals 5, yellow, 8-16 × 3-9 mm.

receptacle glabrous;

sepals spreading or variously reflexed, 4-6 × 2-4 mm, appressed-hirsute;

petals 5(-10), yellow, 7-13 × 4-10 mm.

hemispheric to short-ovoid, 6-10 × 7-10 mm;

achenes 2.2-5.2 × 2-3.8 mm, glabrous, margin forming narrow rib or broad wing 0.1-1.2 mm wide;

beak persistent, lance-subulate, straight or somewhat curved, 0.8-2.6 mm.

hemispheric or globose, 5-8 × 6-8(-10) mm;

achenes 2.2-3.4 × 2-3 mm, glabrous, margin forming narrow rib 0.1-0.2 mm wide;

beak persistent, lanceolate, strongly curved, 0.4-1.6 mm.