Quercus shumardii
Proc. Acad. Nat. Sci. Philadelphia 12: 444. 1860.
Trees, deciduous, to 35 m. Bark gray-brown to dark-brown, shallowly fissured with scaly or light-colored flat ridges, inner bark pinkish. Twigs gray to light-brown, (1.5-) 2-3.5 (-4.5) mm diam., glabrous. Terminal buds gray to grayish brown, ovoid or broadly ellipsoid, 4-8 mm, often noticeably 5-angled in cross-section, glabrous. Leaves: petiole 20-60 mm, glabrous. Leaf-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. Acorns biennial; cup saucer-shaped to cupshaped, 7-12 mm high × 15-30 mm wide, covering 1/4-1/3 nut, outer surface glabrous or puberulent, inner surface light-brown to redbrown, 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.
Phenology: Flowering spring.
Habitat: Mesic slopes and bottoms, stream banks and poorly drained uplands
Elevation: 0-500 m
Distribution
Ont., Ala., Ark., Fla., Ga., Ill., Ind., Kans., Ky., La., Md., Mich., Miss., Mo., Nebr., N.C., Ohio, Okla., Pa., S.C., Tenn., Tex., Va., W.Va.
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).
Selected References
None.