Tanoak, Tanbark Oak
- Broadleaf evergreen tree/shrub, 20-30(90) ft [6-9(27) m] high, varying from narrow and conical to broad and rounded; sometimes a shrub, less than 10 ft (3m)[L. d. var. echinoides, Shrub Tanoak]. Leaves oblong, 6-13 cm long, 2-6 cm wide, thick, leathery, wavy-toothed
border, shiny light green, whitish beneath (tawny pubescence when first unfolded), margin coarsely toothed
to entire, often revolute (rolled under). Flowers are unisexual, male (pollen) flowers are in
catkins 5-10 cm long, white but turning rust colored, with an unpleasant odor; greenish-yellow female (seed)
flowers are found at the base of catkins. Fruit (acorns) are egg-shaped, 2-3 cm long, shallow
saucer-shaped cup, covered with dense bristles; mature in the second year.
- Sun or partial shade, very shade tolerant. Best in rich, moist soil. Stands some
drought when established. One of the few evergreen, broad-leaved trees for the Willamette Valley.
- Hardy to USDA Zone 7 Native range from southwest Oregon (Cascade
Mountains through the Klamath Mountains) to southern California.
- Lithocarpus: from Greek lithos, stone, and karpos, fruit, alluding to the hard fruit (acorn). densiflorus: densely flowered
- Its acorns are oak-like but is flowers are like those of chestnuts or chinkapins. Native Americans removed the shells of the acorn, washed the seeds in hot water to remove the tannins, and then ground them into flour.
- Oregon State Univ., Peavy Arboretum.