Flora of North America species comparison

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

(7.5-)10-30 cm, from rhizomes, rhizomes horizontal.

(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.

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-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.

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 5-7, 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.

sepals usually 5, white, ovate to obovate, rarely oblanceolate, (12-)15-25 × (8-)10-15(-20) mm, glabrous;

stamens 100-120.

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.

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 15-20(-22) cm.

spheric;

pedicel (5-)7-12 cm.

=16.

=14.