Chiba University Matsudo/Kashiwa Campus Plant Database

Details of genus: Quercus L. [18]

genus_ja:

genus_en: Oak

# spp.:

pub_year:

accepted: Accepted

Family: Fagaceae

family_ja: ブナ

Infra familial classification:

distribution_en: N.temperate, South to Malaysia, Columbia

description_en: Genus of about 600 species of monoecious, deciduous, semi-evergreen or evergreen trees and shrubs, widely distributed in woodland and scrub in the N. hemisphere, and grown for their habit and foliage. They have usually fissured bark, downy to hairless shoots, and alternate, entire, lobed, or toothed leaves, which in some deciduous species give excellent autumn colour. The tiny male and female flowers are produced separately on the same plant in late spring and early summer; the males are borne in pendent catkins, the females singly, in pairs, or in racemes, followed by usually ovoid brown nuts (acorns) in scalY cups. The acorns are mostly 1-3cm (1/2-1 1/4in) long, sometimes more, and solitary or paired, but in some species are borne in racemes. Oak trees are best as specimens in a large garden or a park.

hardiness_en: Fully hardy to frost hardy.

cultivation_en:

propagation_en: Sow seed in containers in a cold frame or seedbed as soon as ripe. Graft in mid-autumn or late winter.

pests_en: Susceptible to oak wilt, honey fungus, powdery mildew, aphids, gall wasps, and various bracket fungi. Knopper gall can disfigure acorns.

description_ja:

comment:

comment_ja: コナラ，カシ，クヌギ，カシワ

type_species:

Phylogenetic definition:

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

family: