Compilation
Quercus tardifolia

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Name

Identification
Isotype of Quercus tardifolia C. H. Muller [family FAGACEAE ] (stored under name); Verified by Not on sheet,
Related name
  • Quercus tardifolia
  • Quercus texana
Common name
  • Lateleaf oak, Flora of North America Vol. 3

Flora

Entry for Quercus tardifolia C. H. Muller [family FAGACEAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 3,
Names
Quercus tardifolia C. H. Muller [family FAGACEAE], Bull. Torrey Bot. Club, 63: 154. 1936
Information
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.
Conservation Status
of conservation concern
Phenology
Flowering spring
Altitude range
2000 m
Distribution
USA Tex.
Discussion
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.

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