Flora of North America species comparison

basal, never tuberous.

erect from short caudices, not rooting nodally, glabrous, not bulbous-based.

erect, not bulbous-based, without bulbils.

all basal or sometimes with single, scalelike, cauline leaf;

basal leaves petiolate, blades 3-5-parted, segments again lobed and crenate;

cauline leaf (when present) petiolate or sessile, blade small, palmately or pedately 3-9-lobed.

blades circular to reniform in outline, 3-5-parted, 0.8-3.8 × 1.7-6.9 cm, segments again lobed, ultimate segments elliptic or oblong, margins crenate, apex rounded;

cauline leaf 0-1, scalelike.

terminal, solitary flowers.

receptacle glabrous;

sepals spreading, yellow, 7-11 × 4-7 mm, glabrous;

petals 11-15, yellow, 8-12 × 3-5 mm.

sepals deciduous soon after anthesis, 5;

petals yellow, showy;

nectary scale a crescentic ridge surrounding nectary, glabrous, free margin entire;

style present.

achenes, 1-locular;

achene body cylindric, 1.4-2 times as wide as thick, not prolonged beyond seed;

wall thin, papery, loose, compressed, at maturity forming narrow ventral wing, longitudinally veined;

margin an inconspicuous ridge similar to veins;

beak 1-1.8 mm, much shorter than achene body.

hemispheric or spheric, 7-8 × 9-10 mm;

achenes 2.4-4.6 × 1.2-2.2 mm, glabrous;

beak persistent, filiform, hooked distally, 1-1.8 mm.

roots absent.

= 16.