354 FAGACEAE 



thickened except near the edge ; nut oblong or elliptic in outline, 15-25 mm. long, about 

 twice as long as the cup. IQ. ohtusiloba var. parvifolia Chapm.] 

 In sandy barrens, chiefly near the coast, South Carolina to Florida. 



31. Quercus breviloba (Terr. ) Sarg. A shrub often forming thickets, or a small tree, 

 the trunk clothed with a gray or silvery white bark which scales ofl' in thin strips. Leaf- 

 blades obovate or broadly oblanceolate, or spatulate, 4-12 cm. long, obtuse, shallowly lobed 

 above, bluish green or deep-green and shining above, densely felty tomentose with grayish 

 white hairs beneath, the lobes I'ounded : acorns sessile or nearly so ; cup saucer-shaped, 

 with a thin edge 10-15 mm. broad, tomentose, the scales appressed ; nut slightly obovoid, 

 10-15 mm. long. 



Chiefly in limestone soil, middle and southern Texas. Shin Oak. 



32. Quercus prinoides "Willd. A shrub or small tree, with a slender trunk and a max- 

 imum height of about 5 m. , the bark pale. Leaf-blades obovate, oblanceolate or rarely nearly 

 oblong, 5-15 cm. long, usually acute or short acuminate, coarsely toothed, cuneately nar- 

 rowed or sometimes rounded at the base, glabrous and somewhat shining above, finely gray- 

 tomentose beneath ; petioles 0.5-1.5 cm. long : acorns sessile or nearly so ; cup hemispheric, 

 13-18 mm. broad, thin, its scales appressed, thickened on the back ; nut oblong-ovoid, 

 15-25 mm. long, more than twice as long as the cup. 



In sandy or rocky places, Maine to Minnesota, North Carolina, Alabama and Texas. Chinquapin 

 Oak. Scrub Chestnut Oak. 



33. Quercus acuminata (Michx.) Honda. A handsome tree, reaching a maximum 

 height of about 50 m. and a maximum trunk diameter of 2.5 m., the trunk clothed with a pale- 

 gray or white scaly bark. Leaf -blades varying from lanceolate to oblong-lanceolate, 5-20 cm. 

 long, mostly acuminate at the apex, coarsely serrate, with flaring or rarely depressed teeth, 

 glaljrous and glossy above, glaucous, minutely pubescent or glabrate beneath ; petioles 1-3 cm. 

 long : acorns sessile or nearly so ; cup hemisplieric, about 15 mm. broad, its scales thickened, 

 especially near the base ; nut ovoid, about 15 mm. long, about twice as long as tlie cup. 



Chiefly in limestone soil, Vermont to Ontario, Minnesota, Florida and Texas. Chestnut or Yel- 

 low Oak. 



34. Quercus Prinus L. A forest tree, reaching a maximum height of 30 m. and a 

 trunk diameter of 2 m., the trunk clothed with a dark, hard, close, furrowed bark. Leaf- 

 blades oblong to oval, varying to slightly broadest above or below the middle, 15-20 cm. 

 long, coarsely crenate-serrate, dark green, glabrous and barely shining above, finely gray- 

 tomentvilose beneath ; petioles 1-3 cm. long : acorns short -peduncled ; cup hemispheric, 

 12-35 mm. broad, with appressed bracts ; nut ovoid or oblong-ovoid, 25-35 mm. long, 

 with an edible but not very sweet seed. 



In rocky woods, Maine and Ontario to Georgia and Alabama. Rock Chestnut Oak. 



35. Quercus Michaiixii Nutt. A large tree, reacliing a maximum height of 35 m. 

 and a trunk diameter of 2 m., the trunk clothed with a white or ash-gray bark which sepa- 

 rates in very thin plates. Leaf-blades obovate, varying to oblong, usually acute or short-acu- 

 minate, coarsely serrate, nearly glabrous and often shining above, finely tomentose beneath 

 with white hairs ; petioles 1-3 cm. long : acorns peduncled ; cuj) deep saucer-shaped or 

 shallowly hemispheric, 25-35 mm. broad, finely tomentose, the bracts broad, appressed, 

 often keeled on the back ; nut oblong or oblong-ovoid, 30-35 mm. long : seed sweet, edible. 



In swamps and damp places, Delaware to Indiana, Missouri, Florida and Texas. Cow Oak. 

 Basket Oak. 



36. Quercus Brayi Small. A large tree, sometimes 18 m. tall, or more, with a pale 

 flaky Ijark. Leaves very numerous, deciduous ; blades thin, cuneate, 10-20 cm. long, 

 abruptly acuminate at the apex, regularly and coarsely sinuate-toothed nearly to tlie base, 

 glabrous, with relatively few regular and prominent lateral ribs, deep green above, slightly 

 paler and rather olive-green beneath ; petioles 1.5-2.5 cm. long: acorns sessile or nearly 

 so ; cup hemispheric, 20-25 mm. broad, the lower scales somewhat ^varty on the back ; nut 

 oblong to ovoid, 25-30 mm. long, about 1.5 cm. thick : seed rather sweet. 



In canons, central Texas. White Oak. 



37. Quercus platanoides (Lam. ) Sudw. A stately tree, reaching a maximum height 



of 36 m. and a trunk diameter of 2.5 m., the trunk clothed with a gray or whitish flaky bark. 



Leaf-blades obovate or oblong-obovate, 5-20 cm. long, coarsely toothed or lobed, usually 



cuneately narrowed at the base, deep green and shining above, densely white-tomentose 



beneath, the teeth or lobes rounded ; petioles 1-3 cm. long : acorns usually long-peduncled; 



cup saucer-shaped or depressed-hemispheric, 20-25 mm. broad or rarely smaller, the bracts 



mostly appressed, much -narrower at the edge than at the base ; nut oblong or oblong-ovoid, 



20-25 mm. or nearly 3 cm. long. [Q. hicolor Willd.] 



In swamps or moist places, Quebec to Maine, Iowa, Georgia, Arkansas and Missouri. Swamp 

 White Oak. 



