(sip) 



19- Quercus Mohriana Buckley.* 



A small shrub. Bark of the branches dark gray ; that of 

 the twins lighter and stellate-pubescent : bud-scales brown, 

 pubescent : petioles very short, 2-3 mm. long : leaf-blades 

 thick, oblono- or oval, entire, undulate or sometimes sinuately 

 toothed, pale bluish or brownish green, shining and glabrate 

 above, gray or white stellate-pubescent beneath, 3-5 cm. 

 long, obtuse or cordate at the base, obtuse or acute at the 

 apex: cup hemispheric, 13-15 mm. wide; scales ovate, 

 corkv-thickened on the back; acorn barrel-shaped, about 15 

 mm. long and 10-12. mm. broad. 



This may easily be mistaken for an entire-leaved form of Jj>. 

 undulata, but the pubescence of the lower surface of the leaves 

 is whiter, almost like that of Q. breviloba, and the acorn is 

 much thicker and shorter. The more sinuate leaves resem- 

 ble those of Q. undulata. The entire leaves are like those 

 of Q. grisea, but lack the yellowish tinge of the pubescence 

 of that species. A local shrub of western Texas and ad- 

 jacent Mexico. 



Texas: Valley of Devil's River, 1875, S. B. Buckley 

 {type) ; San Pedro River, Bigelozc (Mex. Bound. Surv.) ; 

 Sand hills, 1881, Dr. Havard. 



Mexico : States of Coahuila and Nuevo Leon, 1880, 

 Palmer, iij8. 



Illustrations: Pl.ji.f. 1-2. 



20. Quercus grisea Liebm. Oversigt Dansk. Vidensk. 



Selsk. Forhandl. 1854: 171. 



Qiiercus undulata var. grisea Engelm. Trans. St. Louis 



Acad. 3: 393. 1877. 



Quercus oblongifolia Torr. Mex. Bound. Surv. 206, in 



part. 1859. 



Quercus undulata Sargent, Silva N. Am. 8: 75, in part. 



1895. 



A shrub usually a few meters high, rarely a small tree. Bark 

 of stems and branches gray, flaky, that of the younger twigs 



* This was never published by Buckle}-, so far as I can find. The name 

 has existed in herbaria for so many years, that it would cause much con- 

 fusion if I were to ignore it and adopt another name for the species. 



