38 MISC. PUBLICATION 4 7 7, U. S. DEPT. OF AGRICULTURE 



Kange: Southwestern United States, Mexico, and Guatemala. 

 Includes: Q. pilicaulis Trel. and several Mexican species, including 

 Q. reticulata Humb. and Bonpl. (type). 



17. Quercus pilicaulis Trel., Mem. Nat. Acad. Sci. 20: 67. pi. 77. 

 1924. 



Quercus tomentosa /3 bullata A. DC. in DC. Prodr. 16 2 : 33. 



1864. 

 Q. tomentosa 8 abbreviata A. DC. in DC. Prodr. 16 2 : 33. 1864. 

 Q. pilicaulis f. macrodonta Trel., Mem. Nat. Acad. Sci. 20: 68. 



pi. 78. 1924. 

 Q. pilicaulis f. obovalis Trel., Mem. Nat. Acad. Sci. 20: 68. pi. 



79.^ _ 1924. 

 Q. pilicaulis i. hurteri Trel., Mem. Nat. Acad. Sci. 20: 68. pi. 



80. 1924. 

 Q. pilicaulis f. armata Trel, Mem. Nat. Acad. Sci. 20: 68. pi. 79. 



1924. 

 Q. pilicaulis f. concava C. H. Mull., Amer. Midi. Nat. 18: 851. 



1937. 

 Q. pilicaulis f. elongata C. H. Mull., Amer. Midi. Nat. 18: 851. 



1937. 

 Q. pilicaulis f. exserta C. H. Mull., Amer. Midi. Nat. 18: 852. 



1937. 

 Q. peduncularis subsp. pilicaulis A. Camus, Monogr. Genre 



Quercus 2: 601. pi. 197, J. 1-10. 1939. 

 Q. peduncularis subsp. hurteri A. Camus, Monogr. Genre Quercus 



2:603. pi. 197 J. 11-14- 1939. 



Large or small tree. Twigs coarse (2 to usually 3 or 4 mm. thick), 

 roundly fluted, brown or soon becoming gray with or without promi- 

 nent lenticels, at first densely fulvous-tomentose, soon glabrate or 

 somewhat persistently pubescent. Buds 2 to 3 mm. long, broadly 

 ovate to rounded, brown, glabrate; the stipules caducous or sometimes 

 persistent about the terminal bud, 10 or 12 mm. long, narrowly ligu- 

 late, dorsally strigose. Leaves evergreen, thick and leathery, 5 to 

 usually 12 or even 20 cm. long, 2.5 to usually 7 or even 12 cm. broad, 

 typically obovate to subrotund or suboblanceolate, broadly rounded 

 at apex (or occasionally in toothed leaves the apical tooth acute), 

 basally cordulate or usually markedly cordate, subentire to undulate, 

 apiculate-undulate, or coarsely acute- or obtuse-toothed, margins 

 cartilaginous and minutely revolute, the blade either flat or markedly 

 crisped or occasionally ventrally deep-concave, upper surface from 

 puberulent soon glabrate except along the midrib and principal veins, 

 somewhat shining, lower surface persistently sparse- or dense-buff- 

 tomentose, the denuded surface rather prominently bulla te ; veins about 

 7 to 10 on each side, obviously branching and anastomosing near the 

 margin but ultimately passing into the teeth, markedly impressed 

 above (including the major reticulum but not the pale and slightly 

 raised smallest veinlets), very prominent beneath; petioles 3 to 7 mm. 

 long, dark brown, tomentose or glabrate. Staminate catkins 6 to 10 

 cm. long, fulvous-pilose, loosely flowered, the glabrous anthers much 

 exserted. Pistillate catkins 1 to 10 or more cm. long, 2- to 15-flowered 

 distally or along the stellate peduncle. Fruit annual, short- or long- 

 pedunculate, the peduncle 2 to 15 cm. long, 1.5 to 2.5 mm. thick, 



