Flora of North America species comparison

(7-)10-25(-30) cm, from caudices, caudices ascending to primarily vertical.

10-40 cm, from rhizomes, rhizomes horizontal.

5-15, 2-ternate, occasionally irregularly so;

petiole 2-10 cm;

terminal leaflet sessile or basally attenuate and appearing petiolulate, obovate to obtriangular, 0.5-3 × 0.5-2 cm, base narrowly cuneate to cuneate, margins incised to dissected on distal 1/3-1/2, apex broadly acute to obtuse, surfaces villous;

lateral leaflets 2x-parted, division frequently irregular; ultimate segments 1-2.6 mm wide.

1, ternate;

petiole 10-25 cm;

terminal leaflet sessile, oblanceolate to ovate, (3.5-)4-7(-8) × 2.5-4(-6) cm, base broadly cuneate, margins coarsely serrate on distal 1/2-2/3, apex acuminate, surfaces ±glabrous;

lateral leaflets unlobed or occasionally 1x-lobed; ultimate lobes 8-25 mm wide.

1(-2)-flowered;

peduncle villous;

involucral bracts 3(-4), 1-tiered, ±similar to basal leaves, highly reduced, 2-ternate or irregularly so, bases distinct;

terminal leaflet sessile or basally attenuate and appearing petiolulate, obovate to pinnatifid, 1-3.5 × 0.5-2 cm, bases narrowly cuneate to cuneate, margins incised to dissected on distal 1/3-1/2, apex broadly acute to obtuse, surfaces villous;

lateral leaflets 2x-parted, division frequently irregular; ultimate segments 1-2.5 mm wide.

1-flowered;

peduncle ±glabrous;

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

terminal leaflet sessile, oblanceolate to ovate, (2-)3-8.7 × 0.8-3 cm, bases narrowly cuneate to cuneate, margins coarsely serrate on distal 1/2 -2/3, apex acuminate, surfaces ± glabrous;

lateral leaflets unlobed or occasionally 1x-lobed; ultimate lobes 15-30 mm wide.

sepals (5-)6-9, white, or abaxially white, tinged blue, and adaxially white, ovate, rarely oblong or narrowly obovate, 8-20 × 6-10 mm, abaxially hairy, rarely glabrous, adaxially glabrous;

stamens 80-100, whitish;

styles white.

sepals (4-)5(-7), white, oblong to elliptic, (13-)15-20(-25) × 5-10 mm, glabrous;

stamens 50-70.

body ovoid, 2-4 × 1-1.5 mm, not winged, woolly;

beak straight, 2-4(-6) mm, glabrous.

body elliptic, flat, 3.5-5 × 1-1.5 mm, not winged, puberulous;

beak straight or slightly curved, 1-1.5 mm, ±glabrous, not plumose.

spheric, rarely cylindric;

pedicel (2-)3-10 cm.

nearly spheric;

pedicel (3-)4-8(-10) cm.