- a shrubby chestnut, Castanea pumila, of the beech family, native to the southeastern United States, having toothed, oblong leaves and small edible nuts.
- a Pacific coast evergreen tree, Castanopsis chrysophylla, of the beech family, having deeply furrowed bark, dark green lance-shaped leaves, and inedible nuts.
- the nut of either of these trees.
- a dwarf chestnut tree, Castanea pumila, of the eastern US, yielding edible nuts
- a large evergreen fagaceous tree, Castanopsis chrysophylla, of W North America
- the nut of either of these trees
