Flora of North America species comparison

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Quercus shumardii

Quercus oblongifolia

schneck oak, Shumard oak, Shumard red oak, Shumard's oak, swamp red oak

Mexican blue oak, Sonoran blue oak
Habit Trees, deciduous, to 35 m. Bark gray-brown to dark brown, shallowly fissured with scaly or light-colored flat ridges, inner bark pinkish. Trees, evergreen, to 10 m. Bark gray or whitish, closely furrowed.
Twigs

gray to light brown, (1.5-)2-3.5(-4.5) mm diam., glabrous.

light brown, 1-1.5 mm diam., densely or sparsely stellate-tomentose, soon glabrate.
Buds

reddish brown, subspheric to broadly ovoid, 1-2 mm, glabrous or basal scales pubescent;

stipules persistent about terminal buds.
Leaves

blade broadly elliptic to obovate, 100-200 × 60-150 mm, base obtuse to truncate, occasionally acute, margins with 5-9 lobes and 15-50 awns, lobes oblong or distally expanded, apex acute;

surfaces abaxially glabrous except for prominent axillary tufts of tomentum, adaxially glossy, glabrous, secondary veins raised on both surfaces.

blade oblong to elliptic, occasionally lanceolate or ovate, (20-)30-60(-80) × (5-)10-25(-30) mm, base cuneate to cordate, margins entire, undulate, sometimes irregularly toothed especially toward apex, secondary veins 7-8(-10) on each side, branched, apex acute or broadly rounded;

surfaces abaxially densely and loosely glandular-tomentose, quickly glabrate or persistently floccose, especially about base of midrib, at maturity strongly glaucous, adaxially dull pale green, bluish green, or glaucous, sparsely stellate-tomentose, quickly glabrate.
Acorns

biennial;

cup saucer-shaped to cup-shaped, 7-12 mm high × 15-30 mm wide, covering 1/4-1/3 nut, outer surface glabrous or puberulent, inner surface light-brown to red-brown, glabrous or with ring of pubescence around scar, scales often with pale margins, tips tightly appressed, obtuse or acute;

nut ovoid to oblong, occasionally subglobose, 14-30 × 10-20 mm, glabrous, scar diam. 6.5-12 mm.

solitary or paired, subsessile or on peduncle 4-12 mm;

cup cup-shaped, about 6-8(-13) mm deep × 10-13 mm wide, enclosing ca. 1/3 nut, scales to 1-1.5 mm wide, moderately, regularly tuberculate near base of cup, gray-pubescent;

nut light brown, ovoid or oblong, 12-17(-19) × (7-)10-12 mm, glabrate or puberulent about apex.
Cotyledons

connate.
Terminal

buds gray to grayish brown, ovoid or broadly ellipsoid, 4-8 mm, often noticeably 5-angled in cross section, glabrous.

Quercus shumardii

Quercus oblongifolia
Phenology Flowering spring. Flowering in spring.
Habitat Mesic slopes and bottoms, stream banks and poorly drained uplands Common in high grasslands and midelevation woodlands, mesas, and canyons
Elevation 0-500 m (0-1600 ft) 1300-1650 m (4300-5400 ft)
Distribution
from FNA
AL; AR; FL; GA; IL; IN; KS; KY; LA; MD; MI; MO; MS; NC; NE; OH; OK; PA; SC; TN; TX; VA; WV; ON
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM; TX; Mexico (Baja California South, Sonora, Chihuahua, and Coahuila)
[WildflowerSearch map]
[BONAP county map]
Discussion

Trees with shallow cups covering ca. one-fourth of the nut are treated as Quercus shumardii var. shumardii; those with more deeply rounded cups covering ca. one-third of the nut are treated as Q. shumardii var. schneckii (Britton) Sargent. Quercus shumardii var. stenocarpa Laughlin was described from several trees in Missouri and Illinois having ellipsoid acorns that were covered less than one-third their length by very small (5.5-7 mm high × 12.5-18 mm wide), shallow cups (K. Laughlin 1969).

Quercus shumardii reportedly hybridizes with Q. buckleyi, Q. falcata (= Q. ×joori Trelease), Q. hemisphaerica, Q. imbricaria (= Q. ×egglestoni Trelease), Q. laevis, Q. laurifolia, Q. marilandica, Q. nigra, Q. palustris (= Q. ×mutabilis E. J. Palmer & Steyermark), Q. phellos (= Q. ×moultonensis Ashe), Q. rubra, and Q. velutina (= Q. × discreta Laughlin).

(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
Q. acerifolia, Q. agrifolia, Q. ajoensis, Q. alba, Q. arizonica, Q. arkansana, Q. austrina, Q. berberidifolia, Q. bicolor, Q. boyntonii, Q. buckleyi, Q. carmenensis, Q. chapmanii, Q. chihuahuensis, Q. chrysolepis, Q. coccinea, Q. cornelius-mulleri, Q. depressipes, Q. douglasii, Q. dumosa, Q. durata, Q. ellipsoidalis, Q. emoryi, Q. engelmannii, Q. falcata, Q. fusiformis, Q. gambelii, Q. garryana, Q. geminata, Q. georgiana, Q. graciliformis, Q. gravesii, Q. grisea, Q. havardii, Q. hemisphaerica, Q. hinckleyi, Q. hypoleucoides, Q. ilicifolia, Q. imbricaria, Q. incana, Q. inopina, Q. intricata, Q. john-tuckeri, Q. kelloggii, Q. laceyi, Q. laevis, Q. laurifolia, Q. lobata, Q. lyrata, Q. macrocarpa, Q. margarettae, Q. marilandica, Q. michauxii, Q. minima, Q. mohriana, Q. montana, Q. muehlenbergii, Q. myrtifolia, Q. nigra, Q. oblongifolia, Q. oglethorpensis, Q. pacifica, Q. pagoda, Q. palmeri, Q. palustris, Q. phellos, Q. polymorpha, Q. prinoides, Q. pumila, Q. pungens, Q. robur, Q. robusta, Q. rubra, Q. rugosa, Q. sadleriana, Q. similis, Q. sinuata, Q. stellata, Q. tardifolia, Q. texana, Q. tomentella, Q. toumeyi, Q. turbinella, Q. vacciniifolia, Q. vaseyana, Q. velutina, Q. viminea, Q. virginiana, Q. wislizenii
Q. acerifolia, Q. agrifolia, Q. ajoensis, Q. alba, Q. arizonica, Q. arkansana, Q. austrina, Q. berberidifolia, Q. bicolor, Q. boyntonii, Q. buckleyi, Q. carmenensis, Q. chapmanii, Q. chihuahuensis, Q. chrysolepis, Q. coccinea, Q. cornelius-mulleri, Q. depressipes, Q. douglasii, Q. dumosa, Q. durata, Q. ellipsoidalis, Q. emoryi, Q. engelmannii, Q. falcata, Q. fusiformis, Q. gambelii, Q. garryana, Q. geminata, Q. georgiana, Q. graciliformis, Q. gravesii, Q. grisea, Q. havardii, Q. hemisphaerica, Q. hinckleyi, Q. hypoleucoides, Q. ilicifolia, Q. imbricaria, Q. incana, Q. inopina, Q. intricata, Q. john-tuckeri, Q. kelloggii, Q. laceyi, Q. laevis, Q. laurifolia, Q. lobata, Q. lyrata, Q. macrocarpa, Q. margarettae, Q. marilandica, Q. michauxii, Q. minima, Q. mohriana, Q. montana, Q. muehlenbergii, Q. myrtifolia, Q. nigra, Q. oglethorpensis, Q. pacifica, Q. pagoda, Q. palmeri, Q. palustris, Q. phellos, Q. polymorpha, Q. prinoides, Q. pumila, Q. pungens, Q. robur, Q. robusta, Q. rubra, Q. rugosa, Q. sadleriana, Q. shumardii, Q. similis, Q. sinuata, Q. stellata, Q. tardifolia, Q. texana, Q. tomentella, Q. toumeyi, Q. turbinella, Q. vacciniifolia, Q. vaseyana, Q. velutina, Q. viminea, Q. virginiana, Q. wislizenii
Synonyms Q. schneckii
Name authority Buckley: Proc. Acad. Nat. Sci. Philadelphia 12: 444. (1860) Torrey: in L. Sitgreaves, Rep. Exped. Zuni Colorado Rivers, 173, plate 19. (1853)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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