Quercus incana |
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bluejack oak |
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Habit | Trees, deciduous, to 10 m. Bark dark brown to black with square plates. |
Twigs | brown to reddish brown, 1-2.5 mm diam., tomentose to sparsely pubescent. |
Leaves | blade narrowly ovate or elliptic to obovate, usually widest near middle, planar, 30-100 × 12-35 mm, base acute (rarely attenuate) to rounded, margins entire, with 1 apical awn (leaves on juvenile or 2d-flush growth may have 2-3 shallow lobes and 3-5 awns), apex acute or obtuse, rarely rounded; surfaces abaxially densely tomentose, hairs in vein axils often reddish, easily distinguished from others, adaxially often glossy, sparsely pubescent, especially along midrib and near base, veins often raised. |
Acorns | biennial; cup saucer-shaped to bowl-shaped, 4.5-8 mm high × 10-18 mm wide, covering 1/4-1/3(-1/2) nut, outer surface pubescent or puberulent, inner surface uniformly pubescent, scale tips tightly appressed, obtuse or acute; nut ovoid (rarely subglobose) to broadly ellipsoid, 10-17 × 10-16 mm, occasionally striate, glabrate, scar diam. 5.5-10.5 mm. |
Terminal | buds light brown to reddish brown, narrowly ovoid to conic, 3.5-7 mm, distinctly 5-angled in cross section, scales pubescent, often tuft of reddish or silvery hairs at apex. |
Quercus incana |
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Phenology | Flowering spring. |
Habitat | Well-drained sandy soils of barrens, hammocks, dunes, and upland ridges |
Elevation | 0-250 m (0-800 ft) |
Distribution |
AL; AR; FL; GA; LA; MS; NC; OK; SC; TX; VA
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Discussion | Quercus incana reportedly hybridizes with Q. falcata [= Q. ×subintegra (Engelmann) Trelease], Q. hemisphaerica (D. M. Hunt 1989), Q. laurifolia (= Q. ×atlantica Ashe), Q. laevis (= Q. ×asheana Little), Q. marilandica (= Q. ×cravenensis Little), Q. nigra (= Q. ×caduca Trelease), and Q. phellos (E. J. Palmer 1948); with Q. pumila (D. M. Hunt 1989); and with Q. velutina (= Q. ×podophylla Trelease), and questionably, Q. myrtifolia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 3. |
Parent taxa | Fagaceae > Quercus > sect. Lobatae |
Sibling taxa | |
Synonyms | Q. cinerea |
Name authority | W. Bartram: Travels Carolina, 378. (1791) |
Web links |