Haplostachys
Haplostachys is a genus of flowering plants in the mint family, Lamiaceae, first described as a genus in 1888. The entire genus is endemic to the Hawaiian Islands, although 4 of the 5 known species that have been placed in the genus are now believed to be extinct, the fifth listed as "Critically Imperiled."
;Species
- †Haplostachys bryanii Sherff - Molokai but apparently extinct
- Haplostachys haplostachya H.St.John - Kauai, Maui, Hawaii; Critically Imperiled
- †Haplostachys linearifolia Sherff - Maui, Molokai but apparently extinct on both islands
- †Haplostachys munroi C.N.Forbes - Lanai but apparently extinct
- †Haplostachys truncata Hillebr. - Maui but apparently extinct