Quercus pumila |
Quercus gravesii |
|
---|---|---|
runner oak, running oak |
Chisos red oak, Graves oak |
|
Habit | Shrubs, deciduous or tardily deciduous, to 1 m. Bark gray to dark brown. | Trees, deciduous, to 13 m. Bark black, roughly furrowed. |
Twigs | gray-brown to reddish brown, 1-2 mm diam., sparsely to uniformly pubescent. |
light brown to dark reddish brown, (1-)1.5-2.5 mm diam., glabrous or glabrate. |
Leaves | blade oblong to narrowly obovate, 25-100 × 10-33 mm, base acute to rounded, margins entire, revolute, with 1 apical awn, apex acute or obtuse to rounded; surfaces abaxially uniformly gray-brown pubescent, rarely glabrate, adaxially somewhat convex, rugose, glabrous or with scattered hairs along midrib. |
blade ovate to elliptic, 45-140 × 20-120 mm, base rounded (rarely subcordate) to obtuse or cuneate, margins with 3-5 acute lobes, 9-20 awns, apex broadly obtuse or acute to attenuate, occasionally falcate; surfaces abaxially light green or coppery green, glabrous with small axillary tufts of tomentum or pubescent along midrib and veins, adaxially shiny or glossy, glabrous except for scattered pubescence near base and along midrib. |
Acorns | annual; cup deeply saucer-shaped to turbinate, 5-12 mm high × 10-15 mm wide, covering 1/3-1/2(-2/3) nut, outer surface pubescent, inner surface densely pubescent, scales rarely involute, often tuberculate, tips tightly appressed, acute; nut globose to ovoid or broadly oblong, 9.5-15 × 9-12 mm, glabrate, scar diam. 5-8 mm. |
biennial; cup turbinate or deeply cup-shaped, 4.5-8.5 mm high × 7.5-12 mm wide, covering 1/3-1/2 nut, outer surface glabrate, inner surface glabrous to pubescent on inner 2/3, scale tips appressed, less than 4 mm, acute; nut ovoid to ellipsoid, rarely subglobose or oblong, 9-16 × 5.5-11 mm, occasionally striate, glabrous to puberulent, especially at apex, scar diam. 3-6 mm. |
Terminal | buds brown to red-brown, ovoid, 2.5-4.5 mm, glabrous or with ciliate scale margins. |
buds brown or reddish brown, ovoid or ellipsoid to subconic, 2-5 mm, glabrous or with tuft of hairs at apex. |
Quercus pumila |
Quercus gravesii |
|
Phenology | Flowering spring. | Flowering spring. |
Habitat | Dry sandy soils of savannahs, low ridges and oak-pine scrub, occasionally at margins of poorly drained sites | Davis, Glass, and Chisos mountains |
Elevation | 0-100 m (0-300 ft) | above 1200 m (above 3900 ft) |
Distribution |
AL; FL; GA; MS; NC; SC
|
TX; n Mexico |
Discussion | Although no hybrid combinations have been formally proposed, D. M. Hunt (1989) has reported evidence of hybridization with Quercus hemisphaerica, Q. incana, Q. myrtifolia, and Q. phellos. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Quercus gravesii reportedly hybridizes with Q. hypoleucoides. As noted above, forms of Q. gravesii and Q. robusta are easily confused and give the impression of belonging to a single morphologic continuum. Some authors have also used the name Quercus texana for Q. gravesii. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Fagaceae > Quercus > sect. Lobatae | Fagaceae > Quercus > sect. Lobatae |
Sibling taxa | ||
Synonyms | Q. chisosensis, Q. shumardii var. microcarpa, Q. stellipila, Q. texana var. chisosensis, Q. texana var. stellapila | |
Name authority | Walter: Fl. Carol., 234. (1788) | Sudworth: Check List For. Trees U.S., 86. (1927) |
Web links |