Flora of North America species comparison

5-30(-35) cm, from short caudices on rhizomes, rhizomes primarily horizontal.

10-60(-75) cm, from caudices, caudices ascending to vertical.

1-5(-7), ternate;

petiole 1-10 cm;

terminal leaflet sessile, obtriangular, (0.5-)0.7-1.8(-2.2) × 0.5-1.3 cm, base cuneate, margins crenate to broadly serrate on distal 1/3, apex obtuse to truncate, surfaces villous to nearly glabrous;

lateral leaflets usually 1x-lobed or -parted; ultimate lobes 4-15 mm wide.

(2-)3-6(-8), primarily 3-foliolate with each leaflet pinnatifid to dissected;

petiole 6-8(-12) cm;

terminal leaflet petiolulate, ovate in outline, (2.5-)3-6(-8) cm, base cuneate, margins pinnatifid to dissected throughout, apex narrowly acute, surfaces villous;

lateral leaflets 2x-parted, pinnatifid; ultimate segments 2-3 mm wide.

1-flowered;

peduncle villous;

involucral bracts 2-3, 1-tiered, simple, ± similar to terminal leaflets of basal leaves, obtriangular, 3-cleft, 0.5-2.5 cm, bases distinct, cuneate, margins crenate to broadly serrate, surfaces villous to nearly glabrous;

segments 3, oblanceolate to obovate;

lateral segments unlobed, 2-8 mm wide.

1-flowered;

peduncle woolly or densely villous, glabrate;

involucral bracts 3, occasionally more, 1-tiered, ±similar to basal leaves, 3-foliolate, ovate in outline, bases distinct;

terminal leaflet petiolulate, 2.5-7 cm (2.5 cm in flower, 7 cm or less in fruit), margins pinnatifid throughout, apex narrowly acute, surfaces villous;

lateral leaflets 2x-parted, pinnatifid; ultimate segments 2-3 mm wide.

sepals 4-7, white or tinged blue or abaxially white, proximally blue, and adaxially white, broadly elliptic to ovate, (7-)8-20 × 4-9 mm, abaxially hairy, adaxially glabrous;

stamens 70-80.

sepals 5-7, white, tinged purple (rarely abaxially blue proximally, white distally, and adaxially white), ovate to obovate, rarely elliptic, 15-30 × 10-17(-19) mm, abaxially hairy, adaxially glabrous;

stamens 150-200.

body obovoid, 2-2.5 × ca. 1 mm, not winged, densely woolly;

beak straight, 1-2.5 mm, glabrous.

body ellipsoid, 3-4 × ca. 1.5 mm, not winged, villous;

beak curved or recurved, reflexed with age, (18-)20-40(-50) mm, long-villous, plumose.

spheric;

pedicel 4-18 cm.

spheric, rarely cylindric;

pedicel 15-20(-22) cm.

=16.

=16.