Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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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).

LITHOCARPUS

TAN OAK, TANBARK OAK

Evergreen
Leaf: stipules early deciduous
Staminate inflorescence: spike, elongate, simple, stiff, spreading or erect; flowers many
Pistillate inflorescence below staminate inflorescence on same or separate stalk; flower 1
Staminate flower: sepals 5–6, minute; stamens 10–12
Pistillate flower: calyx 6-lobed
Fruit: acorn, maturing in 2 years; nut enclosed by cup-like involucre
Species in genus: ± 100 species: w North America (1 sp.), especially se Asia
Etymology: (Greek: rock fruit, from hard fruit wall)

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