Difference between revisions of "Quercus tardifolia"
Bull. Torrey Bot. Club 63: 154. 1936.
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Trees,</b> evergreen. <b>Bark</b> gray, furrowed. <b>Twigs</b> dark reddish brown, 1.5-2.5 mm diam., densely pubescent. <b>Terminal</b> buds brown or reddish brown, ellipsoid or ovoid, 3.5-5.5 mm, apex hairy, scales with ciliate margins. <b>Leaves</b>: petiole 10-20 mm, pubescent or glabrate. <b>Leaf</b> blade broadly elliptic or obovate, widest at or distal to middle, planar, 50-100 × 20-70 mm, base cordate or occasionally rounded, margins with 3-4 lobes with shallow sinuses, 6-12 awns, apex acute or obtuse; surfaces abaxially conspicuously tomentose, primary and secondary veins raised, adaxially somewhat rugose, glabrate. <b>Acorns</b> biennial, immature acorns in pairs, mature acorns not known.</span><!-- |
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|distribution=Tex. | |distribution=Tex. | ||
|discussion=<p>Of conservation concern.</p><!-- | |discussion=<p>Of conservation concern.</p><!-- | ||
| − | --><p>Quercus tardifolia was reported from Mexico (Coahuila) (A. M. Powell 1988), but I have not seen the specimens. It should be expected in the ranges (e.g., Sierra del Carmen) adjacent to the Big Bend area.</p><!-- | + | --><p><i>Quercus tardifolia</i> was reported from Mexico (Coahuila) (A. M. Powell 1988), but I have not seen the specimens. It should be expected in the ranges (e.g., Sierra del Carmen) adjacent to the Big Bend area.</p><!-- |
| − | --><p>This distinctive species is apparently quite infrequent, only two small clumps being known from the Chisos Mountains (C. H. Muller 1951). Recent efforts to locate Quercus tardifolia have not been successful (M. Powell, pers. comm.). Its status is also in question; Muller and K. C. Nixon (pers. comm.) think that it might be a hybrid between Quercus gravesii and Q. hypoxantha.</p> | + | --><p>This distinctive species is apparently quite infrequent, only two small clumps being known from the Chisos Mountains (C. H. Muller 1951). Recent efforts to locate <i>Quercus tardifolia</i> have not been successful (M. Powell, pers. comm.). Its status is also in question; Muller and K. C. Nixon (pers. comm.) think that it might be a hybrid between <i>Quercus gravesii</i> and Q. hypoxantha.</p> |
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name=Quercus tardifolia | name=Quercus tardifolia | ||
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|authority=C. H. Muller | |authority=C. H. Muller | ||
|rank=species | |rank=species | ||
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|publication title=Bull. Torrey Bot. Club | |publication title=Bull. Torrey Bot. Club | ||
|publication year=1936 | |publication year=1936 | ||
| − | |special status=Conservation concern; | + | |special status=Conservation concern;Illustrated |
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V3/V3_688.xml |
|genus=Quercus | |genus=Quercus | ||
|section=Quercus sect. Lobatae | |section=Quercus sect. Lobatae | ||
|species=Quercus tardifolia | |species=Quercus tardifolia | ||
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Latest revision as of 22:50, 5 November 2020
Trees, evergreen. Bark gray, furrowed. Twigs dark reddish brown, 1.5-2.5 mm diam., densely pubescent. Terminal buds brown or reddish brown, ellipsoid or ovoid, 3.5-5.5 mm, apex hairy, scales with ciliate margins. Leaves: petiole 10-20 mm, pubescent or glabrate. Leaf blade broadly elliptic or obovate, widest at or distal to middle, planar, 50-100 × 20-70 mm, base cordate or occasionally rounded, margins with 3-4 lobes with shallow sinuses, 6-12 awns, apex acute or obtuse; surfaces abaxially conspicuously tomentose, primary and secondary veins raised, adaxially somewhat rugose, glabrate. Acorns biennial, immature acorns in pairs, mature acorns not known.
Phenology: Flowering spring.
Habitat: Wooded arroyos
Elevation: 2000 m
Discussion
Of conservation concern.
Quercus tardifolia was reported from Mexico (Coahuila) (A. M. Powell 1988), but I have not seen the specimens. It should be expected in the ranges (e.g., Sierra del Carmen) adjacent to the Big Bend area.
This distinctive species is apparently quite infrequent, only two small clumps being known from the Chisos Mountains (C. H. Muller 1951). Recent efforts to locate Quercus tardifolia have not been successful (M. Powell, pers. comm.). Its status is also in question; Muller and K. C. Nixon (pers. comm.) think that it might be a hybrid between Quercus gravesii and Q. hypoxantha.
Selected References
None.
Lower Taxa
None.