Quercus john-tuckeri |
Quercus vaseyana |
|
---|---|---|
desert scrub oak, Tucker oak, Tucker's oak |
sandpaper oak, Vasey oak |
|
Habit | Shrubs, subevergreen or evergreen, 1-3(-5) m. Bark light gray or brown, scaly. | Shrubs or small trees, evergreen or subevergreen, to 10 m. Bark dark brown, furrowed and exfoliating in long strips. |
Twigs | yellowish or dingy gray, 1-1.5(-2) mm diam., densely tomentulose. |
reddish or grayish brown, 1-1.5 mm diam., short stellate-tomentose or tomentulose, later glabrate or persistently pubescent, rarely glabrous. |
Buds | brown, ovoid or globose, 1.5-2(-3) mm, glabrous except for ciliate margins of scales; proximal scales often yellowish puberulent. |
dark red-brown or gray, round-ovoid, 1-1.5 mm, apex obtuse, sparsely pubescent or glabrate. |
Leaves | blade unicolored, elliptic or obovate, (10-)15-30(-40) × (8-)10-15(-20) mm, thick and leathery, often brittle, base truncate or rounded-attenuate, rarely subcordate, margins irregularly spinose-toothed, occasionally shallowly lobate, secondary veins (3-)4-7, often some veins branching near margin and passing into more than 1 tooth, apex acute or rounded; surfaces abaxially waxy grayish, light green, or yellowish, sparse to moderately dense (8-)10-12-rayed, (loosely) appressed-stellate hairs, often 0.2-0.5 mm diam., and sparse to crowded, yellowish, glandular hairs, adaxially dull grayish, with stellate hairs, similar to abaxial surface. |
blade narrowly lanceolate to usually oblong, mostly planar or slightly convex, 20-60(-90) × 10-20 mm, often rather leathery, base cuneate to rounded, margins coarsely 3-5-toothed on each side or shallowly lobed or entire, with teeth or lobes acute or obtuse, mucronate-tipped, secondary veins 4-6 on each side, usually branched, apex acute, rarely obtuse; surfaces abaxially densely stellate with minute appressed hairs, rarely glabrate and lustrous green, adaxially dark green, lustrous, glabrous or very sparsely stellate-puberulent. |
Acorns | solitary or paired, subsessile; cup cup-shaped or obconic to hemispheric, 5-7 mm deep × 10-15 mm wide, thin, scales whitish or yellowish, moderately or scarcely tuberculate, puberulent; nut fusiform, ovoid, or conic, 20-30 mm, apex acute. |
subsessile or on peduncle 2-3 mm; cup saucer-shaped to cup-shaped, 3-4 mm deep × 10 mm wide, margin thin, scales reddish brown, strongly, regularly tuberculate; nut light brown, ovoid to oblong or subcylindric, to 12 × 12 mm, glabrous. |
Cotyledons | distinct. |
distinct. |
Quercus john-tuckeri |
Quercus vaseyana |
|
Phenology | Flowering spring. | |
Habitat | Dry slopes, chaparral, pinyon and juniper woodlands, margins of oak woodlands and sagebrush | Dry limestone slopes, oak and mesquite woodlands, juniper woodlands, and canyons and ravines in otherwise dry, open grasslands, sometimes descending into margins of dry scrub |
Elevation | 900-2000 m (3000-6600 ft) | 300-600 m (1000-2000 ft) |
Distribution |
CA
|
TX; Mexico (Chihuahua, Coahuila, and Nuevo León) |
Discussion | Dry slopes, chaparral, pinyon and juniper woodlands, margins of oak woodlands and sagebrush; 900-2000 m; Calif. Endemic to California, Quercus john-tuckeri occurs from Los Angeles County northward in the interior Coast Ranges and Sierra Foothills to the northern edge of Sacramento Valley. Quercus john-tuckeri bears some resemblance to both Q. turbinella and Q. berberidifolia. Quercus turbinella has pedunculate fruit and cordate leaf bases, however, and Q. berberidifolia has a glabrate adaxial leaf surface, substantially smaller stellate trichomes with fewer rays on the abaxial leaf surface, heavier tuberculate acorn cups, and blunt or rounded (instead of acute) acorns. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Apparent hybridization between Quercus vaseyana and Q. pungens is discussed under the latter species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Fagaceae > Quercus > sect. Quercus | Fagaceae > Quercus > sect. Quercus |
Sibling taxa | ||
Synonyms | Q. turbinella subsp. californica | Q. pungens var. vaseyana, Q. undulata var. vaseyana |
Name authority | Nixon & C. H. Muller: Novon 4: 391. (1994) | Buckley: Bull. Torrey Bot. Club 10: 91. (1883) |
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