Plate XIV; also fig. i of Plate XV. 

 QUERCUS UNDULATA, Torr. var. GRISEA (Liebm.), Engelm. 



Bibliography. 



QuERCUS oblongifolia, Torre}', in Sitgreaves Exp. 173. t. 19 (1853), not of 



Engelm., Bot. Calif. 

 QuERCUS GRISEA, Liebm., Dansk. Vidensk, Forhandl. 13 (1854). 



, A. De Candolle, Prodr. xvi^ 35 (1864). 



, Sargent, U. S. Forestry Rep. 144 (1883). 



QuERCus UNDULATA, vars. GRISEA and OBLONGATA, Engelm., Trans. St. Louis Acad. 



iii, 382 & 392 (1876); Wheeler's Rep. 250 (1878). 



Description. A small tree with short trunk a foot or two in diameter, and a low 

 rounded head of short branches, the whole seldom more than twentj'- or thirty feet high: 

 leaves an inch and a half or two inches long, elliptical, often cordate at base, obtuse and 

 entire or mucronulate at apex, the margin pungently toothed or quite entire, the whole 

 foliage of a glaucous hue above, stellate-tomentose beneath, as are also the young branch- 

 lets : acorns usually solitary on peduncles of an inch or less ; cup more or less tomentose. 



Habitat. The hill-country of southern New Mexico and Arizona and southward into 

 Texas and Chihuahua; scarcely ascending into the higher mountains except in the depths 

 of the canons, but scattered over the lower hills everywhere singly or in groups, and wear- 

 ing the aspect of orchard trees. 



Remarks. As already indicated, the experience of several years botanizing between 

 southern Colorado a,nd New Mexico long ago taught me that this common oak of the Mex- 

 ican Boundary region is but the full arboreal development of Q. undulata. It hardly de- 

 serves the varietal name with which Dr. Engelmann adorns it. The type of Dr. Torrey's 

 Q. oblongifolia is only an entire-leaved state of it, but what has been called by that name 

 in California is no doubt distinct. 



It will be seen from the bibliography that, if this tree of New Mexico be recognized as 

 distinct from Q. undulata, Q. oblongifolia will be its name, as enjoying a year of priority 

 over Q. grisea. 



