Cyanea scabra Hillebr. var. longissima Rock, Monogr. Stud. Haw. Lobelioid. 259. 1919.
Type information:
Holotype [BISH]. J. F. Rock 8790. April 1911. Maui: East Maui, Honomanu [ditch] trail [along watercourses, northern slopes of Haleakala]. Isotype(s) [A! [2], BISH! [5], GH!, US!].
=Cyanea longissima