Flora of North America species comparison

yellow to medium brown or black, thin, fibrous.

erect, 30-100(-120) dm, glabrous, often from well-developed rhizomes.

erect to reclining, slender, 60-200 cm.

blade 3-4x-ternately compound;

leaflets orbiculate to obovate-cuneate or cordate, apically 3-lobed, 10-30 mm wide, lobe margins coarsely crenate, surfaces glabrous to glandular.

blade: proximal cauline mostly 2x-ternately compound, distal cauline usually ternately compound;

leaflets linear to narrowly lanceolate or oblanceolate, apically occasionally 2-3-lobed, 12-68 × 1-12 mm, length (2.6-)4-26 times width, membranous to leathery, margins sometimes revolute, lobe margins entire;

surfaces abaxially glabrous.

terminal (some flowers in axils of distal leaves), panicles, rather open, many flowered.

racemes to panicles, elongate, few flowered;

peduncles and pedicels neither pubescent nor glandular.

sepals whitish or greenish or purplish tinged, ovate, 3.5-4.4 mm in staminate flowers, 1.5-2 mm in pistillate flowers;

filaments purplish, 4-10 mm;

anthers 1.5-4 mm, long-apiculate;

stigma often purplish.

usually unisexual, staminate and pistillate on different plants;

sepals 4-5, white to yellowish in staminate flowers, greenish in pistillate flowers, obovate, 1.5 mm;

filaments white to purple, 2.5-6 mm;

anthers 0.9-2.5 mm.

6-9, spreading to reflexed, short-stipitate;

stipe 0.4-1.2 mm;

body fusiform, not laterally compressed, (4-)6-9(-10) mm, tapering at both ends, glandular, strongly 3-veined on each side, veins not anastomosing;

beak 3-4.5(-6) mm.

5-6, sessile or nearly sessile;

stipe 0-0.4 mm;

body ellipsoid, 4.5-6 mm, prominently veined, glabrous;

beak 1.3-2.4 mm.

= 210.