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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|publication year=1936 | |publication year=1936 | ||
|special status=Conservation concern;Selected by author to be illustrated | |special status=Conservation concern;Selected by author to be illustrated | ||
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|genus=Quercus | |genus=Quercus | ||
|section=Quercus sect. Lobatae | |section=Quercus sect. Lobatae | ||
|species=Quercus tardifolia | |species=Quercus tardifolia | ||
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Revision as of 13:47, 27 July 2019
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.