Flora of North America species comparison

black, tuberous.

erect, 20-50 cm, glabrous, from rhizomes.

erect, scapose, 10-30 cm, glabrous.

blade 3-4x-ternately compound;

leaflets obovate to orbiculate, apically 3-5-lobed, 5-20 mm, lobe margins crenate, surfaces abaxially glabrous or glandular-puberulent.

blade 2x-ternately compound;

leaflets widely ovate or obovate to nearly rotund, apically 3-lobed, 8-30 mm wide, surfaces glabrous.

terminal, panicles, narrow and dense, many flowered.

umbels or flowers solitary, (1-)3-6-flowered;

involucral bracts usually 3-foliolate, petiolate and opposite, or sessile with leaflets appearing to be whorls of 6 petiolate leaves, otherwise similar to basal leaves.

sepals greenish white, lanceolate or broadly ovate to elliptic or obovate, 2-4 mm;

filaments colored, not white, (1.8-)3-5.5 mm;

anthers 2-3.5 mm, blunt to mucronate;

stigma commonly yellowish.

sepals not caducous, white to pinkish, showy, elliptic to obovate, 5-18 mm, longer than stamens;

filaments narrowly clavate, 3-4 mm;

anthers 0.4-0.7 mm.

5-17, erect to spreading, not reflexed, nearly sessile;

stipe 0.1-0.3 mm;

body often distinctly curved, elliptic-oblong, nearly terete to slightly flattened, adaxial surface 3-4(-6) mm, glabrous to glandular, veins distinct, not anastomosing-reticulate;

beak 1.5-2.5(-3) mm.

(4-)8-12(-15), short-stipitate;

stipe 0.1-0.4 mm;

body ovoid to fusiform, 3-4.5 mm, prominently 8-10-veined.