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

Native

L. densiflorus (Hook. & Arn.) Rehder

TAN OAK, TANBARK OAK

Shrub or tree < 30(45) m; trunk bark grayish brown
Leaves evergreen; petioles 10–25 mm; blade 3–14 cm, oblong to ± ovate, base ± rounded, tip obtuse, margin entire to serrate, upper surface sparsely stellate-hairy, becoming ± glabrous, lower surface finely woolly, becoming ± glabrous
Staminate inflorescence stiff, spreading to erect, densely flowered
Fruit: cup (1.5)2–3 cm diam, saucer-shaped, scales slender, ± tapered, reflexed to spreading; nut 20–35 mm, ovoid to subspheric
Ecology: Redwood to red-fir forests
Elevation: < 2000 m.
Bioregional distribution: Northwestern California, Cascade Range, Sierra Nevada, Central Western California, Western Transverse Ranges
Distribution outside California: s Oregon

Native

var. echinoides (R. Br. ter) Abrams

Shrub 1–3 m
Leaf 3–5(8) cm, 10–30 mm wide; margin entire, slightly wavy, or few-toothed; lower surface with main veins obscure
Ecology: Mixed-conifer and red-fir forests
Elevation: 600–2000 m.
Bioregional distribution: Klamath Ranges, Cascade Range, Sierra Nevada
Distribution outside California: s Oregon
Horticultural information: DRN: 4, 5, 6, 17 &IRR: 1, 2, 3, 7, 14, 15, 16, 18, 19, 20, 21

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bioregional map for LITHOCARPUS%20densiflorus%20var.%20echinoides being generated
 
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Lithocarpus densiflorus var. echinoides
Retrieve dichotomous key for Lithocarpus
Overlay Consortium of California Herbaria specimen data by county on this map
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