Flora of North America species comparison

basal and nodal, never tuberous.

dimorphic, with erect flowering stems and prostrate stolons, not bulbous-based, without bulbils.

basal and cauline;

basal, proximal cauline, and stolon leaves similar, petiolate, base broadly rounded to truncate, margins crenate or crenate-serrate;

distal cauline leaves much reduced, scalelike, simple and undivided.

1-5-flowered cymes.

pedicellate;

sepals deciduous soon after anthesis, 5;

petals 5, yellow;

nectary scale attached basally, forming flap over nectary, glabrous, free margin entire;

style present.

achenes, 1-locular;

achene body discoid to flattened-lenticular, oblong to obovate in outline, 2-4 times as wide as thick, not prolonged beyond seed;

achene wall papery, not loose, longitudinally ribbed, glabrous;

margin prominent narrow ridge;

beak much shorter than achene body.