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desert scrub oak, muller oak, muller's oak
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sandpaper oak, Vasey oak
|
| Shrubs, evergreen or subevergreen, densely branched, 1-2(-3) m. Bark gray, scaly. |
Shrubs or small trees, evergreen or subevergreen, to 10 m. Bark dark brown, furrowed and exfoliating in long strips. |
gray, yellowish, or brownish, 1-1.5 mm diam., densely tomentulose, rarely glabrate. |
reddish or grayish brown, 1-1.5 mm diam., short stellate-tomentose or tomentulose, later glabrate or persistently pubescent, rarely glabrous. |
dull brown, ovoid, 2.5-3 mm, glabrous except for margins of scales. |
dark red-brown or gray, round-ovoid, 1-1.5 mm, apex obtuse, sparsely pubescent or glabrate. |
blade strongly bicolored, ovate to oblong or narrowly obovate, 15-35 ×10-20 mm, rather thick and leathery, base cuneate or attenuate-rounded, margins entire or irregularly, shallowly toothed, teeth mucronate, rarely spinose, secondary veins 6-7 on each side, apex rounded or acute; surfaces abaxially whitish, densely covered with minute, compact, appressed, (8-)10-14(-16)-rayed stellate hairs less than 0.2 mm diam. (lateral fusion of rays visible under high magnification), without glandular seriate hairs, adaxially dull, light green, grayish, or yellowish green, with scattered, appressed-stellate hairs to 0.2 mm diam. |
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. |
solitary or clustered, subsessile; cup deeply cup-shaped or turbinate, to 5-13 mm deep × 12-20 mm wide, scales whitish or cream, strongly tuberculate especially near base of cup; nut dark brown, fusiform or cylyndric, 20-30 × 10-30 mm. |
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. |
distinct. |
distinct. |
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|
|
|
| Flowering early spring. |
Flowering spring. |
| Open chaparral, pinyon and juniper woodlands, desert margins, often on loose granitic soils |
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 |
| 1000-1800 m (3300-5900 ft) |
300-600 m (1000-2000 ft) |
|
CA; Mexico (Baja California)
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TX; Mexico (Chihuahua, Coahuila, and Nuevo León) |
Quercus cornelius-mulleri is easily distinguished from other California scrub oaks by the strongly bicolored leaves, dense minute tomentum of the abaxial leaf surface, and large acute acorns in deep tuberculate cups. Of greater difficulty are swarms of putative hybrids with Q. engelmannii, sometimes referred to as Q. ×acutidens. In Joshua Tree National Monument a lone tree and several shrubs appear to be hybrids and backcrosses between Quercus cornelius-mulleri and Q. lobata. This tree is the basis of Quercus ×munzii J. M. Tucker. (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.) |
| FNA vol. 3. |
FNA vol. 3. |
| Fagaceae > Quercus > sect. Quercus |
Fagaceae > Quercus > sect. Quercus |
Q. acerifolia, Q. agrifolia, Q. ajoensis, Q. alba, Q. arizonica, Q. arkansana, Q. austrina, Q. berberidifolia, Q. bicolor, Q. boyntonii, Q. buckleyi, Q. carmenensis, Q. chapmanii, Q. chihuahuensis, Q. chrysolepis, Q. coccinea, Q. depressipes, Q. douglasii, Q. dumosa, Q. durata, Q. ellipsoidalis, Q. emoryi, Q. engelmannii, Q. falcata, Q. fusiformis, Q. gambelii, Q. garryana, Q. geminata, Q. georgiana, Q. graciliformis, Q. gravesii, Q. grisea, Q. havardii, Q. hemisphaerica, Q. hinckleyi, Q. hypoleucoides, Q. ilicifolia, Q. imbricaria, Q. incana, Q. inopina, Q. intricata, Q. john-tuckeri, Q. kelloggii, Q. laceyi, Q. laevis, Q. laurifolia, Q. lobata, Q. lyrata, Q. macrocarpa, Q. margarettae, Q. marilandica, Q. michauxii, Q. minima, Q. mohriana, Q. montana, Q. muehlenbergii, Q. myrtifolia, Q. nigra, Q. oblongifolia, Q. oglethorpensis, Q. pacifica, Q. pagoda, Q. palmeri, Q. palustris, Q. phellos, Q. polymorpha, Q. prinoides, Q. pumila, Q. pungens, Q. robur, Q. robusta, Q. rubra, Q. rugosa, Q. sadleriana, Q. shumardii, Q. similis, Q. sinuata, Q. stellata, Q. tardifolia, Q. texana, Q. tomentella, Q. toumeyi, Q. turbinella, Q. vacciniifolia, Q. vaseyana, Q. velutina, Q. viminea, Q. virginiana, Q. wislizenii |
Q. acerifolia, Q. agrifolia, Q. ajoensis, Q. alba, Q. arizonica, Q. arkansana, Q. austrina, Q. berberidifolia, Q. bicolor, Q. boyntonii, Q. buckleyi, Q. carmenensis, Q. chapmanii, Q. chihuahuensis, Q. chrysolepis, Q. coccinea, Q. cornelius-mulleri, Q. depressipes, Q. douglasii, Q. dumosa, Q. durata, Q. ellipsoidalis, Q. emoryi, Q. engelmannii, Q. falcata, Q. fusiformis, Q. gambelii, Q. garryana, Q. geminata, Q. georgiana, Q. graciliformis, Q. gravesii, Q. grisea, Q. havardii, Q. hemisphaerica, Q. hinckleyi, Q. hypoleucoides, Q. ilicifolia, Q. imbricaria, Q. incana, Q. inopina, Q. intricata, Q. john-tuckeri, Q. kelloggii, Q. laceyi, Q. laevis, Q. laurifolia, Q. lobata, Q. lyrata, Q. macrocarpa, Q. margarettae, Q. marilandica, Q. michauxii, Q. minima, Q. mohriana, Q. montana, Q. muehlenbergii, Q. myrtifolia, Q. nigra, Q. oblongifolia, Q. oglethorpensis, Q. pacifica, Q. pagoda, Q. palmeri, Q. palustris, Q. phellos, Q. polymorpha, Q. prinoides, Q. pumila, Q. pungens, Q. robur, Q. robusta, Q. rubra, Q. rugosa, Q. sadleriana, Q. shumardii, Q. similis, Q. sinuata, Q. stellata, Q. tardifolia, Q. texana, Q. tomentella, Q. toumeyi, Q. turbinella, Q. vacciniifolia, Q. velutina, Q. viminea, Q. virginiana, Q. wislizenii |
|
Q. pungens var. vaseyana, Q. undulata var. vaseyana |
| Nixon & K. P. Steele: Madroño 28: 210. (1981) |
Buckley: Bull. Torrey Bot. Club 10: 91. (1883) |
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CA
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USDA Plants Database
