Flora of North America species comparison

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

(7.5-)10-30 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.

0-2, ternate;

petiole 10-15 cm;

terminal leaflet sessile, ovate to rhombic, (2.5-)3-5(-6) × (2-)2.5-3.5 cm, base slightly oblique to broadly cuneate, margins crenate to serrate on distal 2/3, apex acuminate, surfaces abaxially glabrous, rarely puberulous on veins, adaxially usually glabrous;

lateral leaflets unlobed, rarely 1x-lobed; ultimate lobes (8-)10-20 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 sparsely hispid or glabrous;

involucral bracts 3, 1-tiered, simple, ±similar to terminal leaflets of basal leaves, ovate, rarely rhombic, (2.5-)4-8 cm, bases distinct, broadly cuneate, margins crenate to serrate, or dentate on distal 2/3, apex acuminate, surfaces usually glabrous;

lateral leaves unlobed or occasionally 1x-lobed; ultimate lobes 8-15 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 usually 5, white, ovate to obovate, rarely oblanceolate, (12-)15-25 × (8-)10-15(-20) mm, glabrous;

stamens 100-120.

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

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

body ovoid, swollen, 2.5-4 × 2-3 mm, not winged, proximally hispid, distally glabrous;

beak straight to subulate, 0.5 mm or less, glabrous.

spheric, rarely cylindric;

pedicel (2-)3-10 cm.

spheric;

pedicel (5-)7-12 cm.

=14.