Bidens micrantha Gaudich. subsp. ctenophylla (Sherff) Nagata & Ganders, Lyonia 2: 11 1983.
Bidens micrantha Gaudich. subsp. kalealaha Nagata & Ganders, Lyonia 2: 6 1983.
Maui, East Maui, Kahikinui, on sheer cliff in Manawainui Gulch out of the reach of goats. 1920 m. 18 December 1980. Hobdy 959.
Holotype
[BISH].
Bidens micrantha Gaudich. var. caduca (Sherff) Sherff, Amer. J. Bot. 22: 705 1935.
Bidens micrantha Gaudich. var. heterophylla (A. Gray) Sherff, Brittonia 6: 339 1948.
Bidens micrantha Gaudich. var. kaalana Sherff, Bot. Gaz. (Crawfordsville) 85: 8 1928.
O`ahu, Wai`anae Range. Hillebrand s.n..
Holotype
[B].
Bidens micrantha Gaudich. var. laciniata (Hillebr.) Sherff, Bot. Gaz. (Crawfordsville) 85: 8 1928.
Bidens micrantha Gaudich. var. rudimentifera Sherff, Bot. Leafl. 3: 7 1951.
Maui, East Maui, Kahua Crater, south Haleakala. 2135 m. 24 November 1950. Hatheway and Greenwell 465.
Holotype
[F].