Pycnanthemum virginianum is a perennial herb to 1 m tall, colonial from rhizomes, fragrant, stem branched above, hairy on angles.
Leaves opposite, narrow, larger ones to 6 long,1 cm wide, margins rough, leaves of inflorescence much smaller, lateral veins 3-4 pairs.
Flowers white, small, bilaterally symmetrical, tubular, 2-lipped, lower lip 3-lobbed, calyx densely wooly, lobes to 0.1 cm, in head-like clusters above bracts; blooming July-Sept.
Fruit dry, 4 1-seeded nutlets.
Wetland status: FAC.
Frequency in NYC: Very infrequent.
Habitat: Open areas, upland woods, fields.