Chiba University Matsudo/Kashiwa Campus Plant Database

Details of genus: Juglans L. [191]

genus_ja:

genus_en: Walnut, Walnut

# spp.:

pub_year:

accepted: Accepted

Family: Juglandaceae

family_ja: クルミ

Infra familial classification:

distribution_en: Med. to E.Asia, N.America

description_en: Genus of about 15 species of deciduous trees, sometimes shrubs, occurring in woodland in S.E. Europe, Asia, North America, and N. South America. They have furrowed bark and alternate, pinnate leaves, usually with toothed leaflets. Greenish yellow male and female flowers are borne separately on the same plant in late spring and early summer; males in pendulous catkins and females inconspicuous. Fruits are ovoid or spherical, initially green, ripening to brown, and contain edible nuts with hard, thin or thick, furrowed shells. Cultivated for their habit, foliage, and fruit, walnuts are fine specimen trees.

hardiness_en: Fully hardy to frost hardy. Late frosts may cause damage.

cultivation_en:

propagation_en: Sow seed in a seedbed as soon as ripe, or stratify and then sow in spring. Named cultivars of J. regia and J. nigra are usually grafted on to seedling stocks.

pests_en: Aphids, walnut blister mites, honey fungus, coral spot, and leaf spot may be a problem.

description_ja:

comment:

comment_ja: クルミ

type_species:

Phylogenetic definition:

Update Information: Created: 2007-12-06 12:51; Updated: 2022-03-09 15:20

family: