Abstract
Euryadegeneri Kobuski (Pentaphylacaceae), a dioecious shrub endemic to Kaua'i, is resurrected from synonymy with E.sandwicensis A. Gray. Euryadegeneri is distributed in montane mesic to wet forests in central and northwestern Kaua'i. It can be distinguished from E.sandwicensis by its glabrous young stems, leaves and pedicels, linear-elliptic to ovate-elliptic leaves, longer pedicels (5-11 mm long), and shorter petals (4.5-7 mm long). A key to Hawaiian Eurya is provided. Two lectotypes are here assigned. Euryadegeneri is preliminarily designated as Critically Endangered according to the IUCN Red List guidelines.