NOTES ON NORTH AMERICAN TREES. L 
QUERCUS 
C. S. SARGENT 
QUERCUS TEXANA Buckley.—The type of this species grows on 
dry limestone hills in the neighborhood of Austin, Texas. Here 
it is a small tree not more than 7-10 m. high and often a large 
shrub rather than a tree. The branchlets are slender, glabrous or 
rarely pubescent, and red or reddish in color, and the winter buds 
are Ovate, acute, with reddish, slightly or densely pubescent scales, 
and usually 4-6.5 cm. in length. The leaves, which are usually 
of the same shape on upper and lower branches, are deeply divided 
by broad sinuses rounded in the bottom into 5~7 lobes, the upper 
lobe 3-lobed at apex, the lateral lobes broad and more or less divided 
at apex into acuminate lobes, with the exception of those of the 
lowest pair which are much reduced and less deeply lobed; the base 
of the leaf is broadly cuneate or concave-cuneate. The leaves are 
only occasionally furnished on the lower surface with small axillary 
tufts of pale hairs; when they unfold they are thickly coated on 
both surfaces with pubescence and are often bright red. On the 
small trees growing on the dry hills of central Texas the acorn is 
about 1.5 cm. long and inclosed for one-quarter to one-half its 
length in a turbinate cup covered with thin, closely appressed, 
pubescent scales rounded at the narrow apex. Descending some- 
times from the hills into better soil, the Texas oak grows taller and 
produces fruit occasionally 2.5 cm. in length, with a turbinate 
cup comparably less deep than that of the smaller fruit produced 
on the neighboring hills. On the Edwards Plateau in western 
Texas trees occur with acorns acute at apex, about 2 cm. long 
and only 7 or 8 mm. in diameter. On some trees in this region the 
leaves are 5-lobed with broad shallow sinuses. The cegictitel 
forms from western Texas can be distinguished: 
QUERCUS TEXANA var. chesosensis, n. var.—Differing from the 
type in the acuminate lobes of the leaves and smaller cups. 
Dry rocky lower slopes of the Chesos Mountains, Brewster County, Texas, 
G. B. Sudworth, November 15, 1913. 
423] {Botanical Gazette, vol. 65 
