Quercus chihuahuensis Trel.  

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Rounded Global Status Rank: G4 - Apparently Secure

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Quercus chihuahuensis:

Quercus chihuahuensis or Chihuahua oak is a species of oak in the family Fagaceae.[2] It is native to the region from extreme western Texas west to Sonora and south to Zacatecas and San Luís Potosí. It grows mostly at mid elevations (400–2000 m) in forests mixed with various pines and other oaks.[3]

Quercus chihuahuensis is a tree up to 10 m tall, very common in much of its range. Leaves are entire to toothed or sublobate, green on the top but yellow or gray on the underside because of a coating of velvety, stellate (star-shaped, highly branched) hairs. The species is related to Quercus arizonica and Quercus grisea, sometimes hybridizing with these two species in Texas.[2][4][5]

References[edit]

  1. ^ The Plant List,Quercus chihuahuensis
  2. ^ a b Trelease, Memoirs of the National Academy of Science vol 20. 1924.
  3. ^
    • Stanley, P.C. 1922. Trees and Shrubs of Mexico. Contributions from the United States National Herbarium 23(2).
    • CONABIO. 2009. Catálogo taxonómico de especies de México. 1. In Capital Nat. México. CONABIO, Mexico City.
  4. ^ Flora of North America v 3
  5. ^ Nixon, K. C. 1993b. The genus Quercus in Mexico. In: T. P. Ramamoorthy et al., eds. 1993. Biological Diversity of Mexico: Origin and Distribution. New York. Pp. 447-458.
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Comments:

Quercus chihuahuensis is a distinctive species throughout its range, mostly in dry montane western Mexico; it occurs in the United States only as putative hybrids with Q . grisea (the Eagle and Quitman mountains) and Q . arizonica (Hueco Tanks) in Texas.

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Distribution:

Tex.; Mexico (Chihuahua, Sonora, Zacatecas, and San Luis Potosí).

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Description:

Shrubs or trees , deciduous, to 10 m. Bark gray, furrowed, checkered, or scaly. Twigs gray, 2-3(-4) mm diam., densely tomentose. Buds reddish brown, broadly ovoid, distally rounded, 2-2.5 mm, densely yellowish pubescent; scales gray-puberulent; stipules persistent, 1-4, subulate, pubescent, at base of terminal buds. Leaves: petiole 3-5(-8) mm. Leaf blade elliptic or oblong to ovate or obovate, (25-)40-50(-85) × (18-)20-30(-50) mm, base rounded or shallowly cordate, margins entire or toothed to sublobate, secondary veins 8 to 10 on each side, somewhat branching, apex broadly rounded to acute; surfaces abaxially yellowish or grayish, densely stellate with velvety hairs, adaxially green, sparsely soft-pubescent with prominent, spreading, stellate hairs, felty to touch, secondary veins somewhat prominent on both surfaces, even under dense tomentum. Acorns 1-3 on tomentose peduncle 15-35(-60) mm; cup hemispheric, 7-10 mm deep × 10-15 mm wide, enclosing 1/2 nut, scales proximally thickened, distally appressed, densely gray-puberulent, tips reddish, ultimately glabrate; nut ovoid, 14-18 × 10-12 mm, puberulent, eventually glabrate. Cotyledons connate.

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Synonym:

Quercus infralutea Trelease; Q. jaliscensis Trelease; Q. santaclarensis C. H. Muller

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Isotype for Quercus chihuahuensis Trel.
Catalog Number: US 930340
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): C. G. Pringle
Year Collected: 1885
Locality: Near Chihuahua., Chihuahua, Mexico, North America

  • Isotype: Trelease, W. 1924. Mem. Natl. Acad. Sci. 20: 85.
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Rights holder/AuthorThis image was obtained from the Smithsonian Institution. Unless otherwise noted, this image or its contents may be protected by international copyright laws.
Sourcehttp://collections.mnh.si.edu/search/botany/?irn=10081957

Isotype for Quercus chihuahuensis Trel.
Catalog Number: US 218771
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): C. G. Pringle
Year Collected: 1885
Locality: Near Chihuahua., Chihuahua, Mexico, North America

  • Isotype: Trelease, W. 1924. Mem. Natl. Acad. Sci. 20: 85.
Licensehttp://creativecommons.org/licenses/by/3.0/
Rights holder/AuthorThis image was obtained from the Smithsonian Institution. Unless otherwise noted, this image or its contents may be protected by international copyright laws.
Sourcehttp://collections.mnh.si.edu/search/botany/?irn=2149997

Isotype for Quercus santaclarensis C.H. Mull.
Catalog Number: US 1822638
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Card file verified by examination of alleged type specimen
Preparation: Pressed specimen
Collector(s): F. Shreve
Year Collected: 1937
Locality: Santa Clara Mts., Chihuahua, Mexico, North America
Elevation (m): 2164 to 2164

  • Isotype: Muller, C. H. 1938. Amer. Midl. Naturalist. 19: 583.
Licensehttp://creativecommons.org/licenses/by/3.0/
Rights holder/AuthorThis image was obtained from the Smithsonian Institution. Unless otherwise noted, this image or its contents may be protected by international copyright laws.
Sourcehttp://collections.mnh.si.edu/search/botany/?irn=2127202

Isotype for Quercus infralutea Trel.
Catalog Number: US 635606
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): J. N. Rose
Year Collected: 1910
Locality: Sierra de Alamos., Sonora, Mexico, North America

  • Isotype: Trelease, W. 1924. Mem. Natl. Acad. Sci. 20: 87.
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Rights holder/AuthorThis image was obtained from the Smithsonian Institution. Unless otherwise noted, this image or its contents may be protected by international copyright laws.
Sourcehttp://collections.mnh.si.edu/search/botany/?irn=2114780
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