Greek karya—walnut tree.
Deciduous trees with continuous, solid pith. Bark smooth, grey, peeling and becoming rough with age. Leaves compound, alternate. Leaflets odd numbered, slightly aromatic, generally toothed. Flowers unisexual but both sexes on the same plant. Male flowers in drooping stalked catkins. Females flowers in spikes of 2-10 flowers. Fruits in clusters on hanging stalks, smooth, sometimes angular, the outer coat splitting into 4-6 parts and containing a single nut.
Most species will hybridise readily in cultivation.
Hickory wood is a valuable source of timber in N America.
Continuous pith; clustered catkins.
About 18 species from NE USA to C America & E Asia (3 species).
Source: (1997). Juglandaceae. In: . Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.