Alphitonia ponderosa Hillebr. var. costata H. St. John, Phytologia 35: 180. 1977.
Type information:
Holotype [BISH]. J. Obata 76-305. 28 November 1976. O`ahu: Wai`anae Mountains, Makua Valley against cliff of backbone, about middle of cliff face in a large V-shaped gulch, edge of steep ridge.1600ft. Isotype(s) [US!].
=Alphitonia ponderosa