Perennials, 40-100+ cm. Stems (from short rhizomes) single, branched distally (among heads), puberulent throughout. Leaves usually opposite (distal sometimes alternate); sessile; blades pinnately nerved, narrowly elliptic, 40-100+ × 5-20 mm, bases cuneate (not perfoliate), margins serrate, apices acute to acuminate, faces puberulent, gland-dotted. Heads in corymbiform arrays. Phyllaries 10-12 in 2-3 series, elliptic to oblong, 1.5-4 × 0.8-1 mm, apices broadly acute to acute, abaxial faces puberulent, gland-dotted. Florets 9-14; corollas 3-3.5 mm. Cypselae 2-3 mm; pappi of 20-30 bristles 3-3.5 mm. 2n = 20. Flowering Aug-Sep. Moist, low ground, pocosins, bogs, cutover woodlands, pine barrens, acid soils; 20-100+ m; N.J., N.C., S.C. Eupatorium resinosum is in the Center for Plant Conservation´s National Collection of Endangered Plants.
Plants 4-10 dm, viscidulous-puberulent throughout, the lvs commonly subtomentosely so beneath; lvs opposite, sessile, slender, 5-13 נ0.5-1.5 cm, evenly serrate, long-acuminate; heads ±numerous in a flat-topped infl; invol 3.5-5 mm, its bracts broadly rounded to acutish, imbricate in ca 3 series, the inner tending to be somewhat whitish distally, the outer less than half as long as the inner; fls white, 9-14 per head; 2n=20. Pocosins, bogs, and other wet places, often in pine-barrens; L.I. (where now probably extinct) and N.J. to Del. and rarely N.C. Aug.-Oct.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
