Flora of North America species comparison

10-35 cm, from rhizomes, rhizomes primarily vertical, occasionally strongly ascending.

(0-)1-2, ternate;

petiole 10-20 cm;

terminal leaflet sessile, rhombic, lanceolate, or oblanceolate, (1.5-)2.5-6 × (1-)2-4 cm, base narrowly cuneate, margins coarsely serrate to coarsely dentate on distal 1/2-2/3, apex acuminate to narrowly acute, surfaces pilose or glabrous;

lateral leaflets unlobed or sometimes 1x-lobed; ultimate lobes 10-19 mm wide.

1-flowered;

peduncle coarsely pilose distally;

involucral bracts 3, 1-tiered, ternate, ±similar to basal leaves, bases distinct;

terminal leaflet sessile, rhombic, lanceolate, or oblanceolate, (1.5-)2-5.5(-7) × (0.6-)1-2.5 cm, base narrowly cuneate, margins coarsely serrate to coarsely dentate on distal 1/2-2/3, apex acuminate to narrowly acute, surfaces pilose or glabrous;

lateral leaflets unlobed or sometimes 1x-lobed; ultimate lobes (5-)8-18 mm wide.

sepals 5-7, white, rarely pinkish, elliptic-obovate to ovate, (6-)8-20 × 6-8 mm, glabrous;

stamens 35-55(-90).

body ellipsoid to obliquely ovoid, 3-4 × 1.5-2 mm, not winged, villous;

beak straight or slightly curved, 0.5-1 mm, glabrous or proximally minutely puberulous, not plumose.

nearly spheric;

pedicel (1.5-)2-5 cm.