Quercus kelloggii Newb.

Kellogg oak (en)

Species

Angiosperms > Fagales > Fagaceae > Quercus

Characteristics

Trees , deciduous, to 25 m. Bark dark brown to black, ridges broad, irregular. Twigs brown to red-brown, (1.5-)2-3.5 mm diam., glabrate. Terminal buds chestnut brown, ovoid, 4-10 mm, glabrous or with scales ciliate on margins. Leaves: petiole 10-60 mm, glabrous to densely pubescent. Leaf blade ovate or broadly elliptic to obovate, 60-200 × 40-140 mm, base cordate to obtuse, occasionally rounded, margins with 7-11 lobes and 13-45 awns, lobes acute to distally expanded, separated by deep sinuses, apex acute; surfaces abaxially glabrous with small axillary tufts of tomentum to densely pubescent, adaxially glabrous to minutely pubescent, veins raised on both surfaces. Acorns biennial; cup saucer-shaped to deeply bowl-shaped, 13-27 mm high × 20-28 mm wide, covering 1/2-2/3 nut, outer surface glabrous to sparsely puberulent, inner surface 1/3 to completely pubescent, scales more than 4 mm long, attenuate or acuminate to acute, smooth, occasionally tuberculate near base of cup, tips loose, especially at margin of cup; nut oblong to broadly ellipsoid, 21-34 × 14-22 mm, puberulent, especially at apex, scar diam. 5.5-10.5 mm. 2 n = 24.
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A large tree. It can grow 18-27 m high and spread 12 m wide. It loses its leaves during the year. It has a large, open, round crown. The bark is thick and cracked into wide ridges. The leaves have deep lobes. There are teeth with bristles along the edge. The leaves are shiny yellow-green above and paler underneath. They can also be hairy underneath. The fruit are acorns on short stalks.
Life form perennial
Growth form tree
Growth support free-standing
Foliage retention deciduous
Sexuality monoecy
Pollination anemogamy
Spread -
Mature width (meter) 7.0
Mature height (meter) 19.0 - 22.5
Root system -
Rooting depth (meter) 0.9
Root diameter (meter) -
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Nitrogen fixer -
Photosynthetic pathway c3

Environment

Found in a variety of forest habitats, growing on clay or gravelly soils in hills and mountains; at elevations below 2,500 metres. Sometimes forms groves of considerable extent in coniferous forests.
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It is a temperate plant. It suits hardiness zones 7-10.
Light 6-8
Soil humidity 4-6
Soil texture 2-4
Soil acidity 3-7
Soil nutriment -
Hardiness (USDA) 8-10

Usage

The acorns are ground into a fine meal and used to make bread. The acorns are cooked and used to make porridge. The dried acorns can be stored.
Uses dye fiber fuel material medicinal wood
Edible fruits nuts seeds
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Can be grown by seedlings.
Mode seedlings
Germination duration (days) 120 - 365
Germination temperacture (C°) 10
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -12
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Leaf

Quercus kelloggii leaf picture by Alana Moceri (cc-by-sa)
Quercus kelloggii leaf picture by Kevin Coffey (cc-by-sa)
Quercus kelloggii leaf picture by Kevin Coffey (cc-by-sa)

Distribution

Quercus kelloggii world distribution map, present in United States of America

Conservation status

Quercus kelloggii threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:296332-1
WFO ID wfo-0000291463
COL ID 78RPJ
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR) Link

Synonyms

Quercus californica Quercus sonomensis Quercus kelloggii Quercus tinctoria var. californica