Difference between revisions of "Quercus ajoensis"
Madroño 12: 140. 1954.
Common names: Ajo Mountain scrub oak
Selected by author to be illustrated
Synonyms: Subspecies (C. H. Muller) Felger & C. H. LoweVariety (C. H. Muller) Little
Treatment appears in FNA Volume 3.
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Shrubs,</b> rarely trees, evergreen, to 2-3 m. <b>Bark</b> gray, scaly or furrowed. <b>Twigs</b> light brown, 1-2 mm diam., inconspicuously short stellate-pubescent or glabrate. <b>Buds</b> brown or reddish brown, ovoid or globose, 1-1.5 mm, variously short stellate-pubescent, tomentose, or glabrate. <b>Leaves</b>: petiole (2-)3-4 m. <b>Leaf</b> blade ovate to narrowly ovate or oblong, (10-)15-35(-50) × (5-)10-20(-30) mm, rather leathery, base cordate, rarely rounded, margins crispate, sometimes flat, cartilaginous, with 4-6(-8) long-attenuate, spinose-awned teeth on each side, secondary veins 5-8 on each side, whitish, apex acute or obtuse with bristly distal teeth; surfaces abaxially blue-green, waxy-glaucous, microscopically papillose, glabrous, sometimes sparsely stellate-pubescent along midrib, adaxially blue-green, glaucous, glabrous or sparingly stellate-pubescent along midrib, secondary veins raised on both surfaces. <b>Acorns</b> solitary or paired on thin axillary peduncle (5-)30-50 mm; cup shallowly cup-shaped, thin, 3-4 mm deep × 6-8(-10) mm wide, enclosing only base of nut, scales brownish, moderately tuberculate, pubescent; nut oblong to narrowly ovoid, 12-15 × 5-8 mm. <b>Cotyledons</b> distinct.</span><!-- |
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|habitat=Rare to locally abundant on igneous slopes | |habitat=Rare to locally abundant on igneous slopes | ||
|elevation=500-1500 m | |elevation=500-1500 m | ||
| − | |distribution=Ariz.;Mexico (Baja California) | + | |distribution=Ariz.;Mexico (Baja California). |
|discussion=<p>Populations of Quercus ajoensis in southern New Mexico show characteristics suggesting introgression from hybridization with Quercus toumeyi, such as increased twig and leaf pubescence and sometimes the prominent golden puberulum of the abaxial leaf surfaces. Hybrids between Q. ajoensis and both Q. turbinella and Q. gambelii (Utah) are also known.</p> | |discussion=<p>Populations of Quercus ajoensis in southern New Mexico show characteristics suggesting introgression from hybridization with Quercus toumeyi, such as increased twig and leaf pubescence and sometimes the prominent golden puberulum of the abaxial leaf surfaces. Hybrids between Q. ajoensis and both Q. turbinella and Q. gambelii (Utah) are also known.</p> | ||
|tables= | |tables= | ||
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|habitat=Rare to locally abundant on igneous slopes | |habitat=Rare to locally abundant on igneous slopes | ||
|elevation=500-1500 m | |elevation=500-1500 m | ||
| − | |distribution=Ariz.;Mexico (Baja California) | + | |distribution=Ariz.;Mexico (Baja California). |
|reference=None | |reference=None | ||
|publication title=Madroño | |publication title=Madroño | ||
|publication year=1954 | |publication year=1954 | ||
|special status=Selected by author to be illustrated | |special status=Selected by author to be illustrated | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna- | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V3/V3_107.xml |
|genus=Quercus | |genus=Quercus | ||
|section=Quercus sect. Quercus | |section=Quercus sect. Quercus | ||
|species=Quercus ajoensis | |species=Quercus ajoensis | ||
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-->[[Category:Treatment]][[Category:Quercus sect. Quercus]] | -->[[Category:Treatment]][[Category:Quercus sect. Quercus]] | ||
Revision as of 14:30, 27 July 2019
Shrubs, rarely trees, evergreen, to 2-3 m. Bark gray, scaly or furrowed. Twigs light brown, 1-2 mm diam., inconspicuously short stellate-pubescent or glabrate. Buds brown or reddish brown, ovoid or globose, 1-1.5 mm, variously short stellate-pubescent, tomentose, or glabrate. Leaves: petiole (2-)3-4 m. Leaf blade ovate to narrowly ovate or oblong, (10-)15-35(-50) × (5-)10-20(-30) mm, rather leathery, base cordate, rarely rounded, margins crispate, sometimes flat, cartilaginous, with 4-6(-8) long-attenuate, spinose-awned teeth on each side, secondary veins 5-8 on each side, whitish, apex acute or obtuse with bristly distal teeth; surfaces abaxially blue-green, waxy-glaucous, microscopically papillose, glabrous, sometimes sparsely stellate-pubescent along midrib, adaxially blue-green, glaucous, glabrous or sparingly stellate-pubescent along midrib, secondary veins raised on both surfaces. Acorns solitary or paired on thin axillary peduncle (5-)30-50 mm; cup shallowly cup-shaped, thin, 3-4 mm deep × 6-8(-10) mm wide, enclosing only base of nut, scales brownish, moderately tuberculate, pubescent; nut oblong to narrowly ovoid, 12-15 × 5-8 mm. Cotyledons distinct.
Phenology: Flowering in spring.
Habitat: Rare to locally abundant on igneous slopes
Elevation: 500-1500 m
Distribution
Ariz., Mexico (Baja California).
Discussion
Populations of Quercus ajoensis in southern New Mexico show characteristics suggesting introgression from hybridization with Quercus toumeyi, such as increased twig and leaf pubescence and sometimes the prominent golden puberulum of the abaxial leaf surfaces. Hybrids between Q. ajoensis and both Q. turbinella and Q. gambelii (Utah) are also known.
Selected References
None.
Lower Taxa
None.