Title: Juglans
Additional Names: Butternut; white walnut; lemon walnut; oil nut
Literature References: Dried inner root bark of Juglans cinerea L., Juglandaceae, collected in the autumn. Habit. North America. Constit. Resinoid juglandin, juglone, juglandic acid, fixed and volatile oils, tannin.
Juglone Julocrotine Juniper Tar Justicidins Juvenile Hormones

Juglans major
Morton Arboretum acc. 614-47*1
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Fagales
Family: Juglandaceae
Subfamily: Juglandoideae
Tribe: Juglandeae
Subtribe: Juglandinae
Genus: Juglans

See text

Juglans is a plant genus of the family Juglandaceae, the seeds of which are known as walnuts. They are deciduous trees, 10–40 meters tall (about 30–130 ft), with pinnate leaves 200–900 millimetres long (7–35 in), 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.