Bidens forbesii Sherff , Bot. Gaz. (Crawfordsville) 70: 103. 1920.
Type information:
Holotype [BISH]. C.N. Forbes 82.K. 23 July 1909. Kaua`i: Wai`oli Valley, [middle fall].
=Bidens forbesii subsp. forbesii

*Verification: R.K. Shannon.

Bidens forbesii Sherff subsp. kahiliensis Ganders & Nagata, Lyonia 2: 9. 1983.
Type information:
Holotype [BISH]. B. Krauss s.n.. June 1980. Kaua`i: ridge SW of Mt. Kahili.680m.
=Bidens forbesii subsp. kahiliensis

*Verification: None.