184 CONTRIBUTIONS FROM THE NATIONAL, HERBARIUM. 



34. Quercus bonplandiana Sweet, Hort. Brit. 370. 182G. 



Qtiercus ambigua Hiinib. & Bonpl. PI. Aequin. 2: 51. 1809. Not Q. amiigua 



Michx. 1901. 

 Hidalgo ; type locality, Morfin. 



Very like the preceding ; differing in its more narrowly obovate, low-crenate, 

 longer-petioled leaves ; fruit unknown. 



35. Quercus rugosa N^e, Anal. Cienc. Nat. 3: 275. 1801. 

 Quercus spicata Humb. & Bonpl. PI. Aequin. 2: 46. 1809. 



Quercus maeropfiylla rugosa Wenzig, Jahrb. Bot. Gart. Berlin 3: 198. 1884. 



Hidalgo ; type locality, in the Cerro de las Navajas, near Morin. 



Twigs rather stout and tomentose ; buds small, subpubescent ; leaves de- 

 ciduous, moderate (3 to 5 ciu. wide, 8 to 10 cm. long), glabrate above, dingj^- 

 tomentose and reticulate-veiny beneath, elliptic-obovate, obtuse, cordate, rather 

 short-petiole<l, callously crenate or coarsely and subpungently low-serrate 

 above ; fruit long-peduncled ; acorn unknown, the rather small shallow cup 

 with acute appressed scales. 



36. Quercus reticulata Humb. & Bonpl. PI. Aequin. 2: 40. 1809. 

 Chihuahua to Mexico and Oaxaca ; type locality, Santa Rosa to Guana- 

 juato. 



Rather large deciduous tree with moderate, somewhat tomentose twigs and 

 small glabrescent buds; leaves rather small (3 to 4 cm. wide, 6 to 7 cm. long), 

 rugose, stellate or brown-tomentose beneath, the midrib scurfy above, obovate, 

 very obtuse, rounded at base or subcordate, short-petioled, repandly callous- 

 dentate above ; fruit pedunded ; acorn ovoid, 10 mm. in diameter, 15 to 20 

 mm. long, scarcely half included, the rounded cup with acute, appressed or 

 loose scales ; wood hard, close-grained, brown, its specific gravity about 0.95. 

 "Palo Colorado" (San Luis PotosI, Palmer); " encina de miel " (San Luis 

 Potosf, Mexico); "encina" (San Luis Potosi) ; "encina quiebra-hacha " (Hi- 

 dalgo Villada) ; " aoatl," " ahoaquahuitl " (Nahuatl, Ramirez); " chaparro," 

 "encina prieta " (Oaxaca, Seler) ; " tnu-yaha," "tnu-yiia " (Oaxaca, Mixtec, 

 Seler). 



Palmer reports the use of the acorns as a substitute for coffee in San Luis 

 Potosr. 



37. Quercus decipiens Mart. & Gal. Bull. Acad. Brux. 10': 214. 1843. 

 Veracruz ; type locality, Mirador. 



Moderately large deciduous tree with rather stout glabrescent twigs and 

 medium-sized rusty-hairy buds; leaves unusually large (12 to 16 cm. wide, 

 18 to 25 cm. long), glabrate above, more or less puberulent and whitened be- 

 neath, obovate, bullate, short-petioled, very obtuse, repand or low-toothed 

 above; fruit very long-peduncled (peduncle up to 25 cm. long) ; acorn oblong, 

 12 mm. in diameter, 20 mm. long, scarcely one-third included, the half-round 

 cup with acute, rather loose scales. 



38. Quercus arizonica Sarg. Gard. & For. 8: 92. 1895. 



Sonora and Chihuahua. Arizona; type locality, Huachuca Mountains. 



Deciduous shrub or small tree with slender tomentose twig^ and glossy 

 glabrate small buds; leaves small (scarcely 3 cm. wide and 6 cm. long), blue- 

 green, somewhat crisped and revolnte, glabrate above, more or less stellate 

 and reticulate beneath, broadly elliptic or subovate, obtuse or acute, sub- 

 cordate, short-petioled, entire or repand or distantly denticulate or serrulate; 

 acorn ovoid, 10 mm. in diameter, 15 to 20 mm. long, nearly half includod, the 

 rounded cup with thickened acute appressed scales ; wood hard and strong, close- 

 grained, dark brown to nearly black, the specific gravity slightly over 1.00. 



