What is "juglans"

Juglans \Jug"lans\, n. [L., walnut.] (Bot.) A genus of valuable trees, including the true walnut of Europe, and the America black walnut, and butternut.

n. The walnut and similar trees of the genus ''Juglans''

Walnut trees are any species of tree in the plant genus Juglans, the type genus of the family Juglandaceae, the seeds of which are referred to as walnuts. All species are deciduous trees, tall, with pinnate leaves , with 5–25 leaflets; the shoots have chambered pith, a character shared with the wingnuts (Pterocarya), but not the hickories (Carya) in the same family.

The 21 species in the genus range across the north temperate Old World from southeast Europe east to Japan, and more widely in the New World from southeast Canada west to California and south to Argentina.