348 FAGACEAE 
bearing a few fertile flowers at the base: calyx-lobes broadly ovate : fruiting involucre bur- 
like, 1-2 cm. in diameter, the rigid spines comparatively few ; nut solitary, 1.5-2 cm. long. 
On sand hills and in barrens, Georgia and Florida to Louisiana. Early spring. CHINQUAPIN. 
2. Castanea pümila (L.) Mill. A shrub or tree, reaching a maximum height of 16 
m., with atrunk diameter of 1m. Trunk clothed with a smooth bark : leaf-blades oblong or 
obovate, acute or rounded at the apex, sinuate-toothed, glabrous above, densely white- 
tomentose beneath, the lateral nerves in 14-20 pairs, quite regularly disposed ; petioles 3-10 
mm. long: staminate aments more or less spreading, 5-20 cm. long, continuous, sometimes 
bearing several fertile flowers at the base: calyx-lobes ovate or oblong, obtuse : fruiting in- 
voluere subglobose, 8-4 em. in diameter, the rigid spines densely disposed ; nuts ovoid, 
1-1.5 em. long, solitary or rarely 2 in a bur, shining, nearly terete. 
In sandy soil, New Jersey to Indiana, Florida and Texas. May and June. CHINQUAPIN. 
3. Castanea dentàta ( Marsh.) Borkh. A forest tree, reaching a maximum height of 
about 30 m., with a trunk diameter of about 4 m. Trunk clothed with a longitudinally fur- 
rowed bark: leaf-blades narrowly elliptic, elliptic-lanceolate or oblong-lanceolate, rarely 
tending to oblanceolate, 10-30 cm. long, acuminate, coarsely and sharply serrate, dark- 
green and shining above, paler beneath, glabrous on both sides; petioles 1-2.5 cm. long: 
staminate aments nearly continuous, 15-30 cm. long, white: calyx-lobes ovate or oblong- 
ovate, obtuse: fruiting involucre globular, 5-7 cm. in diameter, thickly beset with rigid 
m nuts 2, 3 or 5, or rarely 1 in a bur, ovoid, 2-2.5 cm. long, nearly terete, or usually 
attened, at least on one side, appressed-pubescent especially near the apex. 
Chiefly in rich woods, Maine to Ontario and Michigan, Georgia and Alabama. June and July. 
CHESTNUT, AMERICAN CHESTNUT. 
3. QUERCUS L. 
Shrubs or trees, sometimes evergreen, with a hard, coarse-grained wood, all pervaded 
by an astringent principle. Leaf-blades entire, toothed, or lobed, very variable in shape, 
leathery, or firm-membranous, the lateral nerves often prolonged into slender bristles. 
Staminate aments elongated, drooping, clustered. Calyx campanulate, 4—7-lobed, sub- 
tended by caducous bracts. Stamens 6-12: filaments filiform.  Pistillate flowers solitary 
or several together. Calyx often urn-shaped. Ovary usually 3-celled. Styles short, 
usually 3. Ovules 2 in each cavity, but rarely more than 1 in each.pistil maturing. Fruit 
an acorn, consisting of a leathery l-seeded nut subtended by or nearly enclosed in the 
accrescent involuere (cup). Cotyledons half-terete. The plants flower in the spring and 
mature their fruit in the fall of the first or second year. There are many natural hybrids. 
Leaf-blades or their lobes bristle-tipped : styles elongated : nuts often*pubescent within. 
A. Fruit maturing the second season : main stems erect or ascending. 
à. Leaves deciduous, sometimes slightly JE in the far south. 
Leaf-blades entire, little or not at all dilated at the apex, never lobed ex- 
cept on shoots, sometimes with 1 or few teeth near the apex. 
Lower surface of the leaf-blades glabrous. 
Cup of the acorn very flat. 
Leaf-blades acute, linear-oblong to narrowly elliptic or broadest 
slightly above or below the middle. 
Leaf-blades blunt, oblong or euneate. 
Cup of the acorn with a manifest and constricted base. 
Lower surface of the leaf-blades pubescent. 
Leaf-blades brown-tomentose beneath: cup of acorn hemispheric. 
Leaf-blades gray-tomentose beneath: cup of acorn saucer-shaped. 
Leaf-blades dilated near the apex, lobed to pinnatifid. 
Leaf-blades broadened upward, 3-lobed near the apex, occasionally 
with several smaller lobes below. 
Cup of the acorn sauzer-shaped or cup-shaped: leaf-blades spatu- 
late, glabrous. 
Acorns less than 10 mm. long; cup deep 'saucer-shaped : leaf- 
blades thin. 6. Q. microcarya. 
Acorns over 15 mm. long; cup shallowly saucer-shaped: leaf- 
blades thick. . Q. nigra. 
Cup of the acorn hemispheric : leaf-blades obovate, brown-tomentose : 
beneath. 8. Q. Marylandica. 
Leaf-blades pinnatifid or Priest lobed. 
* Leaf-blades green and glabrous on both sides. 
1 Cup of the acorn saucer-sbaped. 
Cup lessthan 18 mm. wide. à 
Acorns or nuts little if at all longer than thick. 
D 
Q. Phellos. 
Q. hybrida. 
. Q. laurifolia. 
. Q. imbricaria. 
. Q. brevifolia. 
op mm 
-I 
Petioles over 2 em. long : leaf-blades with 5-7 lobes. 9. Q. palustris. 
Petioles less than 2 em. long: leaf-blades with 3-5 lobes. 10. Q. Georgiana. 
Acorns or nuts markedly longer than thick. 11. Q. Schneckii. 
Cup over 18 mm. wide. 
f Inner scales of the cup not inflexed. 
Leaf-blades with acute narrow sinuses; lobes usually 
tapering to the apex. 12. Q. rubra. 
