7-Methyljuglone (I), isodiospyrin (II), the 2,2'-binaphthyl-l,l'-quinone (III), and a new quinone (IV), hydroxyisodiospyrin, were isolated from the roots of D. ferrea var. buxifolia. The structure of IV was elucidated as an 8'-hydroxy derivative of isodiospyrin. From the roots of D. maritima plumbagin (V), elliptinone (VI), a new quinone maritinone (VII), and a new tetralone isoshinanolone (VIII) were isolated. Maritinone (VII) was shown to be the 8,8'-dimer of plumbagin, and (VIII) is cis-4,8-dihydroxy-3-methyl-l-tetralone. The naphthoquinones of the genus Diospyros are briefly reviewed.