182 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



21. Quercus glaucescens Humb. »fe Bonpl. PI. Aequin 2: 29. 1809. 

 Sinaloa ; type locality, Caieguale. 



Large deciduous tree with rather slender glabrous twigs and small glabrous 

 buds; leaves lai'ge (5 to 8 cm. wide, 12 to 16 cm. long), densely pale-tomentulose 

 beneath, broadly oblanceolate, obtuse or bluntly subacuminate, cuneate at base, 

 short-petioled, repand or bluntly few-toothed toward the end ; fruit unknown. 

 " Encina memelito " (Ramirez). 



22. Quercus martensiana Trel. 



Quercus afflnis Mart. & Gal. Bull. Acad. Brux. 10 ': 222. 1843. Not Q. affinis 

 Scheidw. 1837. 



Veracruz ; type locality, Zacuapam. 



Deciduous tree with rather slender glabrescent twigs and small hairy buds ; 

 leaves rather large (3 to 5 cm. wide, 12 cm. long), glabrescent above, somewhat 

 tomentulose and hairy beneath, elliptic-oblanceolate to ovate, obtuse at both 

 ends or mucronate and somewhat cordate, short-petioled, subentire or undulate 

 or repandly few-toothed ; acorn subglobose, 10 to 15 mm. in diameter, half 

 included, the rounded cup with thin blunt appressed scales. 



23. Quercus liebmannii Oerst. in Liebm. Chenes Am6r. Trop. 16. 1869, name 

 only. 



Oaxaca ; type locality, Cuesta de San Juan del Estado. 

 ■ Twigs rather slender, reddish, glabrescent ; buds small, glabrescent ; leaves 

 (deciduous?) large (5 to 7 cm. wide, 13 to 17 cm. long), subpersistently pale- 

 tomentose beneath, oblanceolate-obovate, bluntly subacuminate, the narrowed 

 base subcordate, short-petioled, crenate-sinuate ; fruit unknown. 



24. Quercus pandurata Humb. & Bonpl. PI. Aequin. 2: 28. 1809. 

 Quercus ol)tnsata pandurata A. DC. in DC, Prodr. 16 *: 27. 1864. 

 Michoacan ; type locality, Ario. 



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

 transiently fleecy buds; leaves rather large (6 cm. wide, 14 cm. long), finely 

 stellate-scurfy beneath, pandurately oblanceolate-oblong, rather acute, rounded 

 or subtruncate at base, moderately petioled, crenate or somewhat shallowly and 

 bluntly toothed above ; mature fruit unknown, the young cups with acute, some- 

 what keeled, appressed scales. 



With very obtuse, more elongate, and entire leaves it is Q. ohtusa-ta Humb. 

 & Bonpl. (op. cit. 26. 1809). 



25. Quercus macrophylla Nee, Anal. Cienc. Nat. 3:274.1801. 



Quercus magnoliaefoJia macrophylla A. DC. in DC. Prodr. 16 ^: 27. 1864. 



Coahuila to Jalisco, Guerrero, and San Luis PotosI; type locality, between 

 Tixtla and Chilpancingo, Guerrero. 



Rather small deciduous tree with stout, yellow-tomentose but glabrescent 

 twigs, and glabrescent buds 6 mm. in diameter and 10 mm. long; leaves very 

 large (13 to 30 cm. wide and 25 cm. long or more), subglabrescent above, 

 usually persistently tomentulose beneath, round-obovate, very obtuse, rounded 

 or slightly auriculate-cordate at base, subsessile, crisped, undulate to coarsely 

 crenate-toothed ; acorn elongate-ovoid, 20 mm. in diameter, 35 mm. long, 

 scarcely half included, the broad cup with subappressed acute scales. 



26. Quercus resinosa Liebm. Overs. Dansk. Yid. Selsk. Forh. 1854: 182. 1854. 

 Sonora ? ; type locality somewhere in the western Sierra Madre. 

 Deciduous tree with stout tomentose twigs; leaves large (10 to 15 cm. wide, 



20 to 30 cm. long), glabrescent above, gray-puberulent beneath and resinous- 

 punctate along the veins, oblanceolate-obovate, obtuse or subacute, slightly 

 cordate, crisply repand, on short thick petioles ; fruit unknown. 



