350 FAGACEAE 



long, glabrous and shining on both sides or sparingly tomentose beneatli and tufted in the 

 axils of the nerves when young, acute and bristle-tipped at the apex, usually entire, except 

 on young shoots ; petioles 2-5 mm. long : acorns sessile or nearly so ; cup saucer-shaped, 

 10-15 mm. broad, the bracts appressed ; nut subglobose, often depressed or globose-ovoid, 

 about 1 cm. long. 



In sandy soil, Long Island to Missouri, Florida and Texas. Willow Oak. 



2. Quercus hybrida (Chapm. ) Small. A large tree, sometimes 25 m. tall, with a 

 roughish bark and smooth asli -colored branchlets. Leaf -blades oblong to cuneate, 6-12 

 cm. long, rounded or 3-lobed at the apex, or sometimes with an additional lobe on one 

 side, dark green, glabrous on both sides at maturity, gradually or abruptly narrowed into 

 the short petiole: acorn closely sessile, 10-12 mm. long; cup flat, saucer-shaped, 10-12 

 mm. broad, with appressed scales ; nut subglobose or ovoid-globose, fully thrice longer 

 than the cup. [Q. aquatica var. hijbrida Chapm.] 



On sandy or rocky river shores, Georgia and Florida to Mississippi. 



3. Quercus laurifolia Michx. A tree, reaching a height of about 30 m., with a trunk 

 diameter of more than 1 m, the bark of the trunk almost black. Leaf-blades oblong, varying 

 to oval or obovate, 4-13 cm. long, entire or those on shoots unequally lobed, or pinnatifid, 

 all bristle-tipped, slightly thickened and revolute along the margin, deep green and shin- 

 ing above, paler and finally glabrous beneath ; petioles 1-3 mm. long : acorns short -stalked 

 or subsessile ; cup saucer-shaped, 10-15 mm. broad, tlie scales appressed ; nut ovoid or 

 globose-ovoid, 1-1.5 cm. long. 



On sandy banks and in swamps, chiefly near the coast, Virginia to Florida and Louisiana. 

 Lai-eel Oak. 



4. Quercus imbricaria Michx. A forest tree, rarely 30 m. tall, with a maximum 

 trunk diameter of about 1 m, the bark of the trunk brown, fissured. Leaf-blades oblong, 

 varying to lanceolate or oblanceolate, 6-20 cm. long, bristle-tipped, entire, undulately 

 toothed or rarely prominently 3-toothed at the apex, deep green and shining above, softly 

 tomentose beneath ; petioles 0.5-2 cm. long: acorns short-peduncled ; cup nearly hemis- 

 pheric, 15-20 mm. broad, the bracts appressed, obtuse; nut ovoid or subglobose, 10-15 

 mm. long. 



In dry woods, Pennsylvania to Michigan, Nebraska, Georgia and Arkansas. Shingle Oak. 



5. Quercus brevifolia (Lam.) Sarg. A tree, rarely 30 m. high, with a maximum 

 trunk diameter of 5 dm., the bark of the trunk gray and scaly. Leaf-blades oblong, varying 

 to lanceolate or oblanceolate, 5-12 cm. long, entire, undulate or rarely toothed near_ the 

 apex or shallowly lobed, pale green and shining above, gray-toinentose beneath ; petioles 

 3-8 mm. long : acorns often nearly sessile ; cup saucer-sliaped, 10-15 mm. broad, the bracts 

 appressed ; nut oblong or subglobose, 1.5 cm. high, often striate. [Q. cinerea Michx.] 



In sandy soil, chiefly on ridges. North Carolina to Florida and Texas. High-ground Willow 

 Oak. 



6. Quercus microcarya Small. A shrub or small tree, sometimes 5 m. tall, with very 

 crooked branches and glabrous foliage. Leaf-blades thin, spatulate in outline, 5-10 cm. 

 long, undulate or shallowly lobed, gray-green above, yellowish green beneath, short- 

 petioled, the small bristles early deciduous: acorns sessile, less than 10 mm. long ; cup 

 deep saucer-shaped, 0-7 mm. broad ; nut globose-ovoid, often nearly one-half in the cup. 



On granite rocks. Little Stone Mountain, Georgia. 



7. Quercus nigra L. A tree, reaching a maximum height of 30 m., with a trunk di- 

 ameter of a little more than 1 m. , the bark of the trunk smooth. Leaf-blades firm, oblanceolate 

 or spatulate in outline, 5-15 cm. long, entire and sometimes with a dilated terminal lobe or 

 3-lobed at the apex, those of the shoots often pinnatifid, briglit green and glabrous on both 

 surfaces, or somewliat tomentose beneath, the principal nerves ending in bristles ; petioles 

 2-7 mm. long : acorns sessile or short-peduncled ; cup saucer-shaped, 12-15 mm. broad, the 

 scales appressed ; nuts subglobose, 1-1.3 cm. long, pubescent. [Q. aquatica Walt.] 



In sandy soil, along streams. Delaware to Missouri, Florida and Texas. Water Oak. 



8. Quercus Maryldndica Muench. A forest tree, reaching a maximum height of 

 about 20 m., with a trunk diameter of 1 m., the bark of the trunk very rough, black. Leaf- 

 blades broadly or narrowly obovate, 3-5-lobed or with one niucli dilated terminal lobe, firm, 

 deep green and shining above, brownish pubescent beneath, rounded or cordate at the base ; 

 petioles about 0.5-1 cm. long : acorns sessile or short-peduncled ; cup depressed-hemispheric, 

 15-20 mm. broad, constricted at the base, the scales obtuse, appressed ; nuts subglobose or 

 ovoid, 10-20 mm. long, usually one-half included in the cup. [Q. nigra Wang, not L.] 



Chiefly in rocky soil. Long Island to Nebraska, Florida and Texas. Bla"k Jack. Barren Oak. 

 Jack Oak." 



