Pycnanthemum torreyi Bentham. Torrey's Mountain-mint. Phen: Jun-Oct. Hab: Dry rocky woodlands, over mafic, ultramafic, or calcareous rocks, dry powerline rights-of-way. Dist: NH west to IL, south to NC and SC.

ID notes:See Snyder (1994) for additional notes on the identification of P. torreyi.

Origin/Endemic status: Native

Taxonomy Comments: A tetraploid and hexaploid species (n = 40 and ca. 60). The epithet spelling ‘torrei’ is a correctable error.

Synonymy: = C, G, K3, K4, NY, Tn, Va, Chambers & Hamer (1992), Grant & Epling (1943); = Koellia leptodon (Gray) Kuntze – S; = Pycnanthemum torrei – Il, K1, NE, Pa, orthographic variant; > Pycnanthemum torrei var. leptodon (Gray) Boomhour – F, orthographic variant; > Pycnanthemum torrei var. torrei – F, orthographic variant; < Pycnanthemum verticillatum (Michx.) Pers. – RAB

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