Cyanea knudsenii Rock , Monogr. Stud. Haw. Lobelioid. 213. 1919.
Type information:
Lectotype [GH]. V. Knudsen s.n.. s.d.. Kaua`i: Waimea.
Lectotypified in Lammers. Taxon 43: 559. 1994. Isolectotype(s) [B!, BISH!].
=Cyanea hirtella

*Verification: T.G. Lammers.

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

*Verification: T.G. Lammers.