STANDLEY TREES AND SHRUBS OF MEXICO. 195 



95. Quercus tridens Humb. & Bonpl. PI. Aequin. 2: 35. pi. 82. 1809. 

 Hidalgo ; type locality, Moran. 



Very like the preceding, the short-petioled leaves entire or aristately about 

 3-toothed at the end ; mature foliage characters, even, unknown for both 

 species. 



96. Quercus mexicana Humb. <& Bonpl. PI. Aequin. 2: 35. 1809. 

 Quercus castanea mexicana A. DC. in DC. Prodr. 16 ": 72. 1864. 

 Qtcercus castanea integra Oerst. Bidr. Kundsk. Egefam. 362. 1871. 

 Veracruz and Guanajuato ; type locality, Santa Rosa, Guanajuato. 



Small or moderately large deciduous tree with .slender glabrescent twigs and 

 small brown glabrescent butls ; leaves small or narrow (2 to 5 cm. wide, 10 cm. 

 long), rugose, revolute, the midrib puberulent above and the granular lower 

 surface detachably tomentose, elliptic-oblong, subacute, rounded at base or 

 slightly cordate, short-petioled, entire ; acorn ovoid, 10 mm. in diameter, 12 mm. 

 long, half included, the thick-stalked rounded cup with glabrate blunt appressed 

 scales, these sometimes thickened at base or with outcurved margin. 



With still narrower leaves (1.5 cm. wide and 7 cm. long) it is Q. crassipea 

 angustifolia Humb. & Bonpl. (op. cit. 37. 1809) ; and a form of this with 

 crowded leaves is Q. con ferti folia Humb. & Bonpl. (op. cit. 53. 1809). 



97. Quercus crassipes Huiub. & Bonpl. PI. Aequin. 2: 37. 1809. 



Mexico, Guanajuato, and Hidalgo; type locality, Santa Rosa, Guanajuato. 

 Similar to the preceding, but the turbinate cup inroUed at the margin. 



98. Quercus lanigera Mart. & Gal. Bull. Acad. Brux. 10 ': 215. 1843. 

 Oaxaca ; type locality in the Mixteca Alta. 



Twigs slender, glabrescent ; buds small, brown, glabrescent ; leaves deciduous, 

 small (2 to 3 cm. wide, 5 to 6 cm. long), detachably fleecy beneath, elliptic- 

 oblong, aristately obtuse or acute, rounded at base, moderately petioled, entire 

 or with a few awned teeth above ; fruit annual ; acorn subglobose, scarcely 10 

 mm. in diameter, the somewhat turbinate cup with blunt appressed scales. 



99. Quercus castanea Nee, Anal. Cienc. Nat. 3: 276. 1801. 

 Quercus rnucronata Willd. Sp. PI. 4: 436. 1805. 



Hidalgo; type locality, between Ixmiquilpan and Zimapan and Acumbaro. 



Small (deciduous?) tree with rather slender glabrescent twigs and glabrous 

 brown buds 2 mm. in diameter and 4 mm. long; leaves rather small (3 to 4 cm. 

 wide, 7 to 9 cm. long), rugulose, minutely stellate beneath, lance-oblong, aris- 

 tately acute, rounded at base or subcordate, short-petioled, typically aristately 

 low-serrate above ; fruit annual ; acorn round-ovoid, 8 mm. in diameter, 10 mm. 

 long, the rounded cup with blunt appressed scales. 



A form with slightly obovate-elliptic, typically entire leaves, from the same 

 region, is Q. elliptica Nee (op. cit. 278. 1801). 



100. Quercus rug-ulosa Mart. & Gal. Bull. Acad. Brux. 10': 209. 1843. 

 Hidalgo ; type locality, San Pedro y San Pablo, near Real del Monte. 

 Moderate-sized deciduous tree with rather slender glabrescent twigs and small, 



brown, at first fleecy buds; leaves rather small (2 to 4 cm. wide, 6 to 9 cm. 

 long), minutely revolute, reticulately venulose, somewhat stellate, especially on 

 the granular lower surface, elliptic-oblong, mucronately obtuse or subacute, 

 rounded at base or somewhat cordate, moderately petioled, entire ; acorn short, 

 the somewhat turbinate small cup with blunt thin scales. 



101. Quercus grandis Liebm. Overs. Dansk. Vid. Selsk. Forh. 1854: 183. 1854. 

 Oaxaea. Northern Guatemala, the type locality. 



Large deciduous tree with rather slender glabrate twigs and small brown 

 glabrescent buds; leaves large (5 to 10 cm. wide, 14 to 23 cm. long), glabrous, 



