Quercus × guadalupensis Sarg.

Fredericksburg Junction in the valley of the upper Guadalupe River, Kendall County, Texas

rocky creek bank

Oblong-obovate, rounded at apex, gradually narrowed and rounded at base, 5- or rarely 7-lobed, the lateral lobes rounded or broad and truncate at apex; at maturity thin, bluish green, smooth and glabrous on the upper surface, coated below with loose pubescence, 8-10 cm. long and 4. 5-6 cm. wide, with prominent pubescent midribs; petioles pubescent, 8-10 mm. in length.

Solitary, sessile or short-pedunculate, the nut ovate, gradually narrowed and rounded at apex, puberulous, 5-3 cm. long and 2 cm. in diameter, and inclosed for one-third of its length in the cup-shaped cup covered with acuminate hoary-tomentose scales, those of the upper ranks forming a ciliate marginal ring.

A tree with stout branchlets covered during their first season with rusty brown tomentum, becoming gray and glabrous the following year

Ovate acuminate puberulous winter buds.

In shape and size the leaves of this tree are intermediate between those of its supposed parents; the pubescence on their lower surface is that of Q. stellata. The fruit in size resembles that of Q. macrocarpa, but the scales of the cup are less acuminate than those of that species, and the marginal fringe of the cup is only slightly developed. The tomentum of the branchlets is that of Q. macrocarpa.