|Lithocarpus edulis, Kantō region, Japan|
Lithocarpus is a genus in the beech family Fagaceae, differing from Quercus in the erect male spikes. The World Checklist (see link below) accepts 334 species, though some other texts suggest as few as 100 species. About 100 Asian species of the genus were formerly treated in the genus Pasania. All but one are native to east and southeast Asia; the single exception, L. densiflorus, tanoak or tanbark oak, being native to western North America in southwest Oregon and California. The Asian species do not have a well-known English vernacular name, though the generic term stone oak has been proposed.
Although normally included in Lithocarpus, recent genetic evidence suggests that the North American species is only distantly related to Asian species; it may be better transferred to a genus of its own.
They are evergreen trees with leathery, alternate leaves, which may be either entire or toothed. The seed is a nut very similar to an oak acorn, but with a very hard, woody nut shell (hence the genus name, from Greek lithos, stone, + carpos, seed). The nut kernel is edible in some species (e.g. Lithocarpus edulis), but inedible, and very bitter, in others (e.g. L. densiflorus).
Selected species 
- Lithocarpus burkillii
- Lithocarpus cleistocarpus
- Lithocarpus crassinervius
- Lithocarpus curtisii
- Lithocarpus densiflorus - Tanoak
- Lithocarpus dodonaeifolius
- Lithocarpus edulis - Japanese Stone Oak
- Lithocarpus erythrocarpus
- Lithocarpus formosanus
- Lithocarpus glaber
- Lithocarpus hancei - Hance's Tanbark
- Lithocarpus hendersonianus
- Lithocarpus henryi - Henry's Stone Oak
- Lithocarpus indutus
- Lithocarpus kingianus
- Lithocarpus kingii
- Lithocarpus kostermansii
- Lithocarpus kunstleri
- Lithocarpus maingayi
- Lithocarpus neorobinsonii
- Lithocarpus ovalis
- Lithocarpus pachyphyllus
- Lithocarpus platycarpus
- Manos, Paul S.; Zhou, Zhe-Kun; Cannon, Charles H. (2001). "Systematics of Fagaceae: Phylogenetic Tests of Reproductive Trait Evolution" (PDF). International Journal of Plant Sciences 162 (6): 1361–1379. doi:10.1086/322949.
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