15a. Liatris pycnostachya Michaux var. pycnostachya
Liatris bebbiana Rydberg; L. langloisii (Greene) Cory
Corms globose. Stems usually glabrous or sparsely pilose except near heads (where sparsely piloso-puberulent). Leaves glabrous. 2n = 20, 40.
Flowering mid Jun–Aug. Moist prairies, wooded and rocky ridges, sandy woods, creek bottoms, dunes; 30–300(–900) m; Ark., Ill., Ind., Iowa, Kans., Ky., La., Mass., Mich., Minn., Miss., Mo., Nebr., N.J., N.Y., N.Dak., Ohio, Okla., Pa., S.Dak., Tex., Wis.
Liatris pycnostachya is commonly cultivated. Collections from Michigan "doubtless represent escapes" (E. G. Voss, pers. comm.), as also do those from Massachusetts, New Jersey, and New York.