Stems to 1 m, with short, leafy axillary branches, pubescent with short, usually downcurved hairs or longer spreading hairs or both; lvs narrowly lanceolate, entire or shallowly serrate, the largest ones median, 4.5–9.5 × 1–2.5 cm, on petioles 3–6 mm; upper lf-surfaces with scattered hairs, the lower with longer spreading hairs especially on the main veins; glomerules relatively loose and open, each subtended by a pair of lf-like, evenly pubescent bracts; cal 3.5–5 mm, short-hairy, weakly bilabiate, its teeth narrowly deltoid, somewhat acuminate, ciliate with several jointed bristles at the tip, the upper 3 ca 2/3 as long as the lower pair, these 0.5–2 mm; nutlets glabrous, or hairy at the tip; 2n=76. Locally near the coast from Mass. to N.C. Sometimes thought to reflect hybridization of nos. 4 [Pycnanthemum incanum (L.) Michx.] and 11 [Pycnanthemum verticillatum (Michx.) Pers.].
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