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Similar to no. 2 [Pluchea odorata (L.) Cass.] in aspect, avg taller, to 2 m, sometimes perennial, and more glabrate; lvs thinner, on the avg more serrate, and more evidently petiolate, avg a little narrower and more acuminate; infl generally round-topped, often ± elongate; invol 4–6 mm, sometimes purplish, but more often not, merely granular-glandular, or nearly glabrous; disk 3–6 mm wide; 2n=20. Wet or moist, nonsaline places; Del. and Md. to n. Fla., w. to s. O., s. Ill., and e. Okla. and Tex. Aug.–Oct. (P. petiolata)
