Herbs, perennial, with thick rootstock. Stems erect, unbranched, 70–100(–130) cm, glabrous. Leaves: petiole 0–2 mm; blade lance-oblong to oblanceolate-oblong, 50–100 × 13–30 mm, base attenuate to cuneate, margins entire, apex usually acute, sometimes obtuse to rounded, minutely apiculate, abaxial surface glabrate to sparsely pilose, adaxial surface glabrous; venation pinnate, midvein prominent. Cyathial arrangement: terminal pleiochasial branches 3–6, each unbranched or 1–2 times 2-branched, occasionally appearing pendent; pleiochasial bracts lance-ovate, shorter than distal leaves; dichasial bracts distinct, cordate-deltate to reniform, base subcordate, margins entire, apex rounded; axillary cymose branches 0–10. Cyathia: peduncle 0–1 mm. Involucre narrowly campanulate, 2.1–3 × 3–4.2 mm, glabrous; glands 5, elliptic to slightly reniform, 1–1.2 × 1.5–2.1 mm; horns absent. Staminate flowers 10–15. Pistillate flowers: ovary glabrous; styles 3–3.5 mm, 2-fid. Capsules globose, 4.5–5.2 × 6–6.8 mm, 3-lobed; cocci rounded, verrucose, sometimes minutely so, glabrous; columella 4–4.8 mm. Seeds mottled silver-brown, ovoid-globose, 3–4 × 2.5–3.5 mm, smooth; caruncle subconic, reniform, 0.8–1.1 × 1.4–1.6 mm.
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Stout perennial to 1 m from a short, stout rhizome; cauline lvs elliptic to narrowly lance-oblong, 5–10 × 1–3 cm, obtuse, entire, often sparsely villous beneath; lvs subtending the umbel shorter and broader, commonly ovate, those of the umbel depressed-ovate to reniform; rays of the primary umbel 5–8, rarely fewer; involucres 3 mm, glabrous, often purplish above; fr 6–8 mm, rough, with small irregular projections; seeds plump, subglobose, 3–4 mm, smooth, mottled brown. Dry or moist woods, rare; N.J. and Pa. to W.Va. and N.C. May, June. (E. darlingtonii; Tithymalus d.; Galarhoeus d.)
Can be grown by divisions. Seeds needs soaking.
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