190 CONTRIBUTIONS FROM THE NATIONAL, HERBARIUM. 



64. Quercus omissa A. DC. in DC. Prodr. 16 ': 28. 1864. 

 Type locality, somewhere in the western Sierra Madre. 



Twigs moderate, somewhat puberulent ; buds elongate, dull brown, hairy at tip, 

 scarcely 3 mm. in diameter and 6 mm. long; leaves (deciduous?) rather small 

 (3 to 4 cm. wide, 5 to 6 cm. long), rugose, slightly revolute, creamy-tomentulose 

 beneath, typically obovate, obtuse, cordate, short-petioled, aristately somewhat 

 coarsely stiff-serrate above; acorn subglobose, 8 mm. in diameter, the rather 

 deep cup with very blunt appressed scales. 



65. Quercus pulchella Humb. & Bonpl. PI. Aequin. 2: 44. 1809. 

 Type locality, between Guanajuato and Santa Rosa. 



Twigs slender, glabrescent ; buds small, dark brown, glabrate ; leaves decidu- 

 ous, small (2 to 3 cm. wide, 4 to 6 cm. long), rugose, yellow-tomentulose beneath, 

 oblong-obovate, obtuse, often subtruncately cordate, slender-petioled, aristately 

 low-serrate; fruit annual (?), the rounded cup with glabrous blunt appressed 

 scales. 



66. Quercus floccosa Liebm. Overs. Dansk. Vid. Selsk. Forh. 1854: 178. 1854. 

 Veracruz?; type from the Pico de Orizaba, at 2,600 to 3,200 meters. 



Twigs moderate, at first rusty-scurfy; leaves (deciduous?) rather large (6 

 to 9 cm. wide, 9 to 16 cm. long), rugose, typically fleecy beneath, elliptic-obo- 

 vate, aristately subacute, rounded at base, entire or with a few short teeth 

 above, the moderate petiole fleecy ; fruit unknown. 



67. Quercus crassifolia Humb. & Bonpl. PI. Aequin. 2: 49. 1809. 



Quercus spinulosa Mart. & Gal. Bull. Acad. Brux. 10 ': 218. 1843. 



Guerrero to Veracruz and San Luis PotosI; type locality, Chilpancingo, Gue- 

 rrero. 



Rather large deciduous tree with somewhat stout, more or less scurfy twigs 

 and glossy glabrate buds 3 mm. in diameter and 5 mm. long; leaves large (6 

 to 9 cm. wide, 12 to 14 cm. long), rugose, scurfy on the nerve above, tawny- 

 fleecy beneath with the denudable surface granular, elliptic, obovate, or 

 rounded, variously obtuse or subacuminate, cordate, short-petioled, aristate- 

 undulate or stiffly low-toothed; fruit annual; acorn ellipsoid, 12 mm. in diam- 

 eter, 15 to 20 mm. long, one-third or more included, the deep saucer-shaped 

 cup with rounded appressed scales. 



68. Quercus fulva Liebm. Overs. Dansk. Vid. Selsk. Forh. 1854: 183. 1854. 

 Chihuahua. Durango, and Michoacfm ; tlie type from an unrtM^orded locality 



in the western Sierra Madre. 



Twigs stout, densely tomentose ; buds brownish, tomentose ; leaves 4 to 9 cm. 

 wide, 8 to 14 cm. long, densely tomentose beneath, petioled, aristately serrate. 

 " Roble " ( Durango ) . 



69. Quercus stipularis Humb. & Bonpl. PI. Aequin. 2: 47. 1809. 

 Type locality, near Actopan (Veracruz?). 



Twigs rather stout, fleecy ; buds brownish, somewhat pubescent, 3 mm. in 

 diameter, 5 mm. long; leaves deciduous, moderate (4 to 5 cm. wide, 7 to 10 

 cm. long), rugose, puberulent above on the midrib, rusty-fleecy beneath, elliptic- 

 ovate to obovate, subacuminate. cordate, moderately petioled, aristately ser- 

 rate; fruit annual; acorn ovoid, 12- mm. in diameter, 15 mm. long, scarcely 

 one-third included, the rounded cup with blunt, rather loose scales. 



70. Quercus chicamolensis Trel. 



Quercus mollis Mart. & Gal. Bull. Acad. Brux. 10 ': 216. 1843. Not Q. moUis 



Raf. 1838. 

 Oaxaca ; type locality, in the Mixteca .Vita. 



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