Flora of North America species comparison

dimorphic, some filiform, 0.2-0.6 mm thick and some with tuberous bases 1-2 mm thick.

decumbent, sparsely pilose.

erect, 11-40 cm, villous, each with 8-35 flowers.

persistent, blades ovate, orbiculate, or transversely elliptic, outer blades undivided, inner 3-parted or 3-foliolate, 1-3.3 × 1-3 cm, base truncate to broadly obtuse or sometimes weakly cordate, margins crenate, apex rounded-obtuse.

sessile;

receptacle glabrous or pilose;

sepals 3, spreading, 1-2 × 0.5-1 mm, hirsute;

petals 3, 1-2 × 0.5-0.8 mm.

pedicels glabrous or villous;

receptacle glabrous;

sepals 2-4 × 1-1.5 mm, abaxially glabrous or pubescent, hairs colorless;

petals 5, 1.5-3.5 × 0.5-1.5 mm;

nectary scale glabrous.

hemispheric, 2-2.5 × 3-3.5 mm;

achenes 10-15 per head, 1.3-1.7 × 1-1.3 mm, faces and proximal margin finely papillate, each papilla crowned with hooked bristle, otherwise glabrous;

beak semicircular to deltate, curved, 0.2-0.5 mm.

globose to cylindric, 3-7 × 2-4 mm;

achenes 1.1-1.5 × 1-1.3 mm, glabrous;

beak subulate, straight or curved, 0.2-0.3 mm.

and lower cauline leaf blades reniform, 3-parted, 0.8-1.7 × 1.2-2 cm, segment base cordate, margins dentate or lobulate, apex rounded-obtuse.

= 16.