This variable species is widespread across eastern states but most common in midwestern regions; 2n = 32 and 64. A distinct segregate is supected in c. Tenn. and maybe some adjacent states (W). In Ky. albidum is virtually restricted to xeric calcareous sites, but to the south and west it does occur locally on more acid soils (FNA 26, W, Y). Flowers in Ky. are generally white, but sometimes violet,: including colls. from ADAI, FAYE, JESS, LEWI and MORG.