Family Code: JUGLAN Genus Code: JUGLA Genus CN: walnut Genus Authority: L. Genus Summary: A genus of about 21 species, trees and shrubs, of Mediterranean Europe to e. Asia, and North America to Andean South America. Stanford, Harden, & Parks (2000) present a molecular phylogeny and a discussion of biogeography; our two species are distantly related within the genus, with J. nigra most closely related to sw. North American J. microcarpa and J. major, and J. cinerea most closely related to several e. Asian species. Genus References: Whittemore & Stone in FNA (1997); Stanford, Harden, & Parks (2000); Stone in Kubitzki, Rohwer, & Bittrich (1993); Stanford (1998). Last Updated: 2019-11-29 Publish: 1