Genus Juglans
See textSpecies in the genus Juglans of plants
Juglans australis - J. australis is a spreading deciduous tree, up to 25 m. wide which produces first quality lumber, with a straight trunk up to 6 m. tall and up to 5 dm. in diameter. The wood is dense , hard, and strong. Upon drying, the radial shrinkage is 2.2%, the tangential 4.7%. The pinnately compound leaves are borne alternately, and bear up to fifteen oval-lanceolate finely serrate leaflets.
Southern california walnut - J. californica is generally found in the southern California Coast Ranges, Transverse Ranges, and Peninsular Ranges, and the Central Valley. It grows as part of mixed woodlands, and also on slopes and in valleys wherever conditions are favorable. It is threatened by development and overgrazing. Some native stands remain in urban Los Angeles in the Santa Monica Mountains and Hollywood Hills. J. californica grows in riparian woodlands, either in single species stands or mixed with California's oaks and cottonwoods .
West Indian walnut - This is a large tree which can reach 25 meters in height. The compound leaves are each made up of several lance-shaped, toothed leaflets up to 9 centimeters long. Trees bear male and female inflorescences, the male a catkin up to 11 centimeters long and the female an array of flowers at the end of a newly grown shoot. The fruit is a drupe roughly 2 to 3 centimeters long with a black husk and a seed, which is an edible walnut meat, inside.
Andean walnut - Juglans neotropica is a species of plant in the Juglandaceae family. It is found in Colombia, Ecuador, and Peru. It is threatened by habitat loss. Common names include Colombian Walnut, Ecuadorian Walnut, Andean Walnut, Nogal, Cedro Negro, Cedro Nogal, and Nogal Bogotano.
Juglans olanchana - J. olanchana grows in wet and very wet tropical forests, most frequently on river banks, observed from 0-1400 m above sea level. Reports that it also grows in the mountainous regions of Argentina may result from confusion with the cedro negro or nogal
Persian Walnut - Juglans duclouxiana Dode J. fallax Dode J. kamaonia Dode J. orientis Dode J. regia var. sinensis C. de Candolle J. sinensis Dode