Cyanea knudsenii Rock var. glabra E. Wimm., in Engler, Pflanzenr. IV. 276b. (Heft 106): 75. 1943.
Type information:
Holotype [BISH]. C.N. Forbes 2598.M. 24 June 1920. Maui: Honomanu Gulch, west bank. Isotype(s) [W! [3]].
=Cyanea glabra