FAGACEAE 
Leaf-blades with rounded broad sinuses; lobes usually 
TI 
dilated near the apex. 
tt Inner scales of the cup inflexed. 
++ Cup of the acorn turbinate or hemispheric. 
Acorns less than 15 mm. long ; cup hemispheric, less than 15 
mm. broad. 
Acorns over 20 mm. long; cup turbinate, over 15 mm. broad. 
** Leaf-blades pubescent beneath. 
Cup of the acorn turbinate : leaf-blades brown- or rusty-pubescent 
beneath. 
Cup of the acorn saucer-shaped : leaf-blades gray- or white-pubes- 
cent beneath. 
Large trees : leaves with lanceolate lobes. 
Leaf-blades rounded at the base; lobes 3-5. 
Leaf-blades cuneate or truncate at the base; lobes 5-13. 
Shrubs or small trees: leaves with triangular lobes. 
b. Leaves persistent. 
B. Fruit maturing the first season : stems underground, the branches erect. 
Leaf-blades, or their teeth or lobes without bristles (except on shoots): nuts often 
glabrous within. 
Leaves persistent. 
Stems underground, the branches upright. 
Stems erect. 
Leaf-blades prominently rugose-reticulated : cup of the acorn turbinate. 
Leaf-blades not rugose-reticulated : cup of the acorn hemispheric (ex- 
cept in Q. fusiformis). 
Leaf-blades entire (or sometimes spiny-toothed on shoots): nuts fusi- 
form to ovoid, over 18 mm. long and 9 mm, thick. 
Acorns less than twice as long as thick ; cup hemispheric ; nut ovoid 
or oblong-ovoid. 
Acorns over twice as long as thick; cup turbinate ; nut fusiform. 
Leaf-blades sinuate-toothed: nuts cylindric or oblong-cylindrie, less 
than 18 mm. long and 9 mm. thick. 
Leaves deciduous. 
Leaf-blades entire or sinuate-undulate or merely lobed at the apex. 
e ie the acorn saucer-shaped. 
eaf-blades pubescent beneath: cup thin and with a thin edge: nut of 
an obovoid type. 
Leaf-blades glabrous: cup thick and with a thick corky edge: nut of 
an oblong or ovoid type. 
uis the acorn hemispheric. 
oung leaf-blades white beneath ; mature leaves glabrous, prominently 
lobed near the apex. 
Young leaf-blades tawny beneath ; mature leaves pubescent beneath, 
irregularly lobed or merely angulate. 
Leaf-blades coarsely toothed or lobed. 
Leaf-blades toothed or shallowly lobed. 
Acorns sessile. 
Shrubs or small trees : leaf-blades mostly broadest above the middle. 
Cup saucer-shaped : margins of the leaf-blades irregular. 
Leaf-blades pubescent beneath : cup thin and with thin edges: 
nut of an obovoid type. 
Leaf-blades glabrous: cup thick and with athick corky edge: 
nut of an oblong or ovoid type. 
Cup hemispheric : margins of the leaf-blades regular. 
Tall trees : leaf-blades mostly broadest below the middle. 
Acorns peduncled. 
Peduncles shorter than the petioles or about equalling them. 
Bark close, dark-colored : leaf-blades gray-tomentose beneath. 
Bark flaky, white: leaf-blades glabrous or white-tomentose 
beneath. 
Leaf-blades leathery, densely pubescent beneath, with many 
^ _ lateral nerves and many relatively small teeth. 
Leaf-blades membranous, glabrous, with few lateral nerves 
and few large teeth. 
Peduncles much longer than the petioles. 
Leaf-blades prominently or deeply lobed. 
Mature leaf-blades more or less pubescent beneath : cup fully 4%as long 
as the nut. 4 
Upper scales of the cup awned, forming a fringe around the nut. 
Upper scales of the cup not awned. 
Acorn broader than high ; nut immersed in the cup or nearly so. 
Acorn longer than broad ; nut about 14 longer than the cup. 
Leaf-blades obovate, gray or yellowish beneath, with 3-5 ample 
dilated lobes. 
Leaf-blades with rounded upper lobes: cup 11-14 mm. 
broad ; nut 12-14 mm. long. 
Leaf-blades with truncate or emarginate upper lobes: cup 
15-20 mm. broad ; nut 15-20 mm. long. ; 
Leaf-blades cuneate, brown or yellowish brown beneath, with 
3-7 low never dilated lobes. 
Mature leaf-blades glabrous and pale, or glaucous beneath: cup shallow. 
13. 
15. 
25. 
e 
e 
38. 
39. 
Q. 
. Q. 
. Q. 
Q. 
Q. 
40. Q. 
41. Q. 
43. 
Q. 
Q. 
349 
. Schneckit. 
Catesbaei. 
Texana. 
coccinea. 
. velutina. 
. digitata. 
. pagodaefolia, 
. nana. 
. myrtifolia. 
pumila. 
minima. 
. geminata. 
Virgiuiana, 
. fusiformis. 
. undulata, 
. Durandi. 
Laceyi. 
austrina. 
. Chapmanii. 
. breviloba. 
. Laceyi. 
. prinoides. 
acuminata. 
Prinus. 
Michauxii. 
Brayi. 
platanoides. 
macrocarpa. 
lyrata. 
Margaretta. 
minor. 
Boyntonii. 
alba. 
1. Quercus Phéllos L. A tree, reaching a maximum height of about 25 m. and a 
ey diameter of 1 m., sometimes evergreen, the bark of the trunk nearly smooth. Leaf- 
lades linear-oblong or narrowly-elliptic, varying to lanceolate or oblanceolate, 4-10 cm. 
