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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

FAGACEAE

OAK FAMILY

John M. Tucker

Shrub or tree, monoecious, deciduous or evergreen
Leaves simple, alternate, petioled; margin entire to lobed; stipules small, generally deciduous
Staminate inflorescence: catkin or stiff spike; flowers many
Pistillate inflorescence 1–few-flowered, generally above staminate inflorescence; involucre in fruit generally cup-like or lobed and bur-like, bracts many, generally overlapping, flat or cylindric
Staminate flower: sepals generally 5–6, minute; petals 0; stamens 4–12+
Pistillate flower: calyx generally 6-lobed, minute; petals 0; ovary inferior, style branches generally 3
Fruit: acorn (nut subtended by scaly, cup-like involucre) or 1–3 nuts subtended by spiny, bur-like involucre; nut maturing in 1–2 years
Seed generally 1
Genera in family: 7 genera, ± 900 species: generally n hemisphere. Wood of Quercus critical for pre-20th century ship-building, charcoal for metallurgy; some now supply wood (Fagus, Quercus ), cork (Q. suber ), food (Castanea , chestnut).

QUERCUS

OAK

Evergreen or deciduous
Leaf: stipules small, generally early deciduous
Staminate inflorescences: catkins, 1–several, slender, on proximal part of twig
Pistillate inflorescence axillary among upper leaves, short-stalked; flower generally 1
Staminate flower: calyx 4–6-lobed, minute; stamens 4–10
Pistillate flower: calyx minute, generally 6-lobed; ovary enclosed by involucre
Fruit: acorn, maturing in 1–2 years; nut enclosed by cup-like involucre with thin or tubercled scales
Chromosomes: 2n=24 for all reports
Species in genus: ± 600 species: n hemisphere, to n South America, India
Etymology: (Latin: ancient name for oak)
Many more hybrids have been named but are not included here. Reproduction of many species declining.

Native

Q. cornelius-mulleri Nixon & K. Steele

MULLER'S OAK

Shrub 1–2.5 m, evergreen, densely branched; twigs finely tomentose
Leaf 2.5–3.5 cm, leathery; petiole 2–5 mm; blade oblong, ovate, or narrowly obovate, tip acute to rounded, margin entire or 4–6-toothed, upper surface sparsely puberulent, dull, yellow- to gray-green, lower surface densely and finely tomentose, whitish, midrib yellow
Fruit maturing in 1 year; cup 12–20 mm wide, 5–8 mm mm deep, hemispheric to cup-shaped, scales ± flat, gray-canescent; nut 20–30 mm, elliptic in outline to widely conic, tip obtuse, puberulent, shell glabrous inside
Ecology: Slopes, generally granitic soils, chaparral, pinyon woodland
Elevation: 1000–1800 m.
Bioregional distribution: San Bernardino Mountains (n slope), Peninsular Ranges (e slope), s Desert Mountains (Little San Bernardino Mtns)
Distribution outside California: Baja California
Hybridizes with Q. engelmannii, Q. lobata.
Horticultural information: DRN, SUN: 7, 9, 14, 15, 16, 18, 19, 20, 21, 22, 23 &IRR: 2, 3, 8, 10, 11; STBL.

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