Flora of North America species comparison

basal, never tuberous.

erect, stolons absent, not bulbous-based, without bulbils.

all basal or sometimes with 1-2 cauline leaves;

basal leaves petiolate, blades shallowly lobed;

cauline leaves (when present) sessile or petiolate, blades small, scalelike, rarely shallowly 3-lobed, margins crenate.

1-2-flowered cymes.

pedicellate;

sepals deciduous soon after anthesis, 5;

petals 8-12, yellow or greenish;

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

style present.

achenes, 1-locular;

achene body cylindric, about as wide as thick, not prolonged beyond seed;

wall papery, not loose, longitudinally veined;

margin an inconspicuous ridge similar to veins;

beak much shorter than achene body.