Quercus pumila |
Quercus margarettae |
|
---|---|---|
runner oak, running oak |
dwarf post oak, runner oak, sand post oak |
|
Habit | Shrubs, deciduous or tardily deciduous, to 1 m. Bark gray to dark brown. | |
Bark | light gray, scaly. |
|
Twigs | gray-brown to reddish brown, 1-2 mm diam., sparsely to uniformly pubescent. |
green or reddish, becoming gray, 1-2(-3) mm diam., glabrous. |
Buds | reddish brown, ovoid, 2-3(-6) mm, apex obtuse, sparsely pubescent to 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 obovate to narrowly obovate, (25-)40-80(-135) × 20-40(-80) mm, base cuneate to rounded-attenuate, margins moderately to deeply lobed, lobes rounded or spatulate, sometimes middle or distal 2 lobes compound, with secondary lobe on proximal side, divergent at right angles, forming cruciform pattern, secondary veins 3-5 on each side, apex broadly rounded; surfaces abaxially light green, with interlocking, erect, 2-4(-6)-rayed stellate hairs, velvety to touch, adaxially dark green, glossy, glabrous or sparsely stellate, not harsh to touch. |
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. |
1-3, subsessile or on peduncle to 20 mm; cup deeply cup-shaped, basally rounded or constricted, (7-)9-12 mm deep × 12-20 mm wide, enclosing to 3/4 nut, scales loosely appressed, finely grayish pubescent; nut light brown, ovoid, 15-25(-30) × 9-13(-16) mm, glabrous. |
Cotyledons | distinct. |
|
Terminal | buds brown to red-brown, ovoid, 2.5-4.5 mm, glabrous or with ciliate scale margins. |
|
Small | trees or shrubs , deciduous, to 12 m, sometimes rhizomatous. |
|
Quercus pumila |
Quercus margarettae |
|
Phenology | Flowering spring. | |
Habitat | Dry sandy soils of savannahs, low ridges and oak-pine scrub, occasionally at margins of poorly drained sites | Deep sands and gravels, often in dense woods as understory or in open scrubland and pine barrens |
Elevation | 0-100 m (0-300 ft) | 0-600 m (0-2000 ft) |
Distribution |
AL; FL; GA; MS; NC; SC
|
AL; AR; FL; GA; LA; MO; MS; NC; OK; SC; TX; VA
|
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.) |
Historical records for Quercus margaretta exist for New York, but no current population is known there. Populations of post oak in east Texas (the Cross Timbers region) on sands and gravels exhibit characteristics somewhat intermediate between Quercus stellata and Q. margaretta; most of the trees at those localities have leaves with abaxial surface similar to Q. margaretta, leaf shape more similar to Q. stellata, and twigs somewhat intermediate between the two species in diameter and varying from tightly pubescent to glabrate. Acorn characters tend toward Q. margaretta as well. These populations have been treated as Q. drummondii Liebmann, the Drummond post oak. Similar intermediates occur sporadically throughout the range of the post oaks in southeastern United States, but they do not form such continuous and morphologically stable populations; perhaps the Texas material is best treated as a nothospecies, Q. ×drummondii. (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. Quercus |
Sibling taxa | ||
Synonyms | Q. minor var. margaretta, Q. stellata var. margaretta | |
Name authority | Walter: Fl. Carol., 234. (1788) | (Ashe) J. K. Small: in J. K. Small, Fl. S.E. U.S., 355. (1903) |
Web links |