(216) 



A peculiar oak, related to JzK Fendleri and J^. Havardi 

 on the one hand and Q. pungcns on the other, but easily dis- 

 tinguished from the first two by the few spinulose-tipped lobes, 

 from the latter by the larger fruit and from all three by the 

 large broad leaves. It grows in rich soil of Central Arizona. 



Arizona: Beaver Creek, 1891, D. T. MacDougal (type 

 in U. S. Nat. Herb.). 



Illustrations : PL 30. f. 2. 



17. Quercus pungens Liebm. Oversigt Dansk. Vidensk. 



Selsk. Forh. 1854: 171. 



JQiiercus Emoryi Torr. Mex. Bound. Surv. 206, in part. 

 1859. 



£>iiercus EmoryiYox\.. & Coult. Syn. Fl. Col. 127. 1874. 



£>iiercus undiilata 3 Wrightii Engelm. Trans. St. Louis 

 Acad. 3: 382, in part. 1876. 



£>iiercus undiilata var. pungens Engelm. Trans. St. Louis 

 Acad. 3 : 392. 1877. 



Quercus undulata Greene, West Am. Oaks 1 : 27, in part. 



1889; Sargent, Silva N. Am. 8: 75, in part. 1895. 



A low shrub, 1-3 m. high, rarely larger. Bark of the 

 stem and branches gray, that of the younger twigs more 

 yellowish or brownish, densely stellate-pubescent : bud-scales 

 brown, slightly pubescent: petioles very short, 2-5 mm. 

 long : leaf-blades oval or broadly oblong, obtuse at the base, 

 acute at the apex, deeply sinuately toothed, 3-5 cm. long, 

 thick and firm, usually decidedly undulate and twisted ; 

 upper surface pale bluish or brownish green, rather dull, 

 sparingly, but usually permanently, stellate ; lower surface 

 more or less densely stellate, pale yellowish or brownish, some- 

 times strongly reticulate, especially in age ; lobes triangular 

 and usually spinulose-tipped : cup hemispherical, 8-10 mm. in 

 diameter; scales with very prominent corky thickenings; 

 acorns barrel-shaped, 10-13 mm. long, obtuse or acutish, 

 light brown. 



JjK pungens is nearest related to ^. undulata but the leaves 



are deeper lobed, firmer, usually decidedly undulate or 



crisped and more pubescent and more reticulate beneath, the 



