Walnut, Hickory and Pecan Family

Mostly deciduous trees. Buds brown and hairy in winter. Leaves alternate (rarely opposite), pinnate with an odd or even number of leaflets, sometimes aromatic; stipules absent. Flowers unisexual but both sexes on the same plant. Male flowers forming catkins on previous year's growth, each flower with 3-40 stamens. Female flowers forming spikes on new twigs. Perianth 4-lobed (occasionally reduced or absent). Pollination is by wind. Carpels 2, fused together. Ovary inferior with 1 chamber and 1 apical ovule, style short, stigmas 2. Fruit a nut or drupe.

The relatives of this family are uncertain but it is often associated with the Anacardiaceae; it is also well represented in the Tertiary fossil floras of America and Eurasia.

Best known commercially for the edible walnut and pecan; oils extracted from these nuts are used in cosmetics, soap, foods, cooking oil and paints. Trees of several species provide excellent fine-grained timber, especially the hickories and walnuts and there is also some demand for the charcoal.

Trees with pinnate exstipulate leaves; flowers in catkins; ovary inferior, producing a nut fruit.

9 genera and about 62 species, mostly north temperate but also subtropical, extending into the southern hemisphere.

Source: Spencer, R. (1997). Juglandaceae. In: Spencer, R.. 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.

kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Rosanae
order      Fagales
Higher taxa
Subordinate taxa
genus        Carya Nutt.
genus        Juglans L.