narrow-leaved mountain mint, slender mountain mint
[Koellia flexuosa auct. non (Walter) MacMill.]
Etymology: Pycnanthemum: from Greek pychnos, "dense," and anthemon, "flower," so "densely flowered"
Plants: erect, perennial, 20"-32" tall forb, almost odorless; stems square, hairless, very leafy with many short branches
Leaves: opposite, linear, very narrow, small, toothless
Flowers: pink to white, 5-parted, 1/4"-1/3" long; inflorescence a 3" wide, branched, terminal, umbel-like cluster of many, very dense, small, rounded heads; blooms July-Sept.
Fruits: 1-seeded nutlet
Habitat: dry; upland woods, prairies
Conservation Status: Introduced - locally established
Floristic Rating: Wetland Indicator = FAC USDA Plants Database: Federal Distribution and detailed information including photos Dan Tenaglia's The Missouri Flora: Fabulous photographs; detailed descriptions; color and leave arrangement key. David G. Smith's "Delaware Wilflowers": Beautiful photographs; descriptions Illinois Wildflowers: Wonderful photographs; detailed descriptions; color and leaf arrangement key