The Juglandaceae are a plant family known as the walnut family. They are trees, or sometimes shrubs, in the order Fagales. Members of this family are native to the Americas, Eurasia, and Southeast Asia.
DC. ex Perleb
|The range of subfamily Engelhardioideae|
|The range of subfamily Juglandoideae|
The nine or ten genera in the family have a total of around 50 species, and include the commercially important nut-producing trees walnut (Juglans), pecan (Carya illinoinensis), and hickory (Carya). The Persian walnut, Juglans regia, is one of the major nut crops of the world. Walnut, hickory, and gaulin are also valuable timber trees while pecan wood is also valued as cooking fuel.
Members of the walnut family have large, aromatic leaves that are usually alternate, but opposite in Alfaroa and Oreomunnea. The leaves are pinnately compound or ternate, and usually 20–100 cm long. The trees are wind-pollinated, and the flowers are usually arranged in catkins.
The fruits of the Juglandaceae are often confused with drupes but are accessory fruit because the outer covering of the fruit is technically an involucre and thus not morphologically part of the carpel; this means it cannot be a drupe but is instead a drupe-like nut.
The known living genera are grouped into subfamilies, tribes, and subtribes as follows:
- Subfamily Rhoipteleoideae Reveal
- Subfamily Engelhardioideae Iljinskaya 1990
- Subfamily Juglandoideae Eaton 1836
- Tribe Platycaryeae Nakai 1933
- Platycarya Siebold & Zucc. 1843
- Tribe Juglandeae Rchb. 1832
- Tribe Platycaryeae Nakai 1933
|Wikisource has the text of the 1920 Encyclopedia Americana article Juglandacæ.|
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- "GRIN Genera of Juglandaceae". Germplasm Resources Information Network. United States Department of Agriculture. Archived from the original on 2015-09-24. Retrieved 2011-11-17.
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