STANDLEY TREES AND SHRUBS OF MEXICO. 181 



15. Quercus nudinervis Liebm. Overs. Dansk. Vid. Selsk. Forh. 1854: 182. 

 1854. 



Type locality, in the Cerro de Pinal. 



Twigs moderate, glabrous; leaves large (5 to 9 cm. wide, 13 to 17 cm. long), 

 glabrescent, obovate or oblanceolate, obtuse or bluntly acuminate, rather 

 decurrent on the short moderate petiole, low-crenate ; fruit unknown, 



16. Quercus standleyi TreL, sp. nov. 



Sonora ; type in the U. S. National Herbarium, no. 635607, collected in the 

 Sierra de Alamos, in 1910, by Rose, Standley, and Russell (no. 12789). 



Deciduous glabrous tree with rather slender orange-brown twigs and small 

 round buds with tomentulose-ciliate scales; leaves rather large (6 to 12 cm. 

 wide, 15 to 24 cm. long), elliptic-obovate, obtuse at both ends, short-petioled, 

 coarsely crenate, paler beneath, with white veins and margin ; fruit unknown. 



17. Quercus polymorpha Cham. & Schlecht. Linnaea 5:78. 1830. 

 Quercus petiolaris Benth. PI. Hartw. 55, 348. 1840. 



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



Veracruz, Nuevo Leon, and San Luis PotosI; type locality, near Jalapa. 

 Veracruz. Said to be tlie chief component of the forest on the Uaxac Canal, 

 Guatemala. 



Medium-sized deciduous tree with rather slender glabrous twigs and some- 

 what hairy buds 4 mm. in diameter and 6 mm. long; leaves rather large (3 

 to 6 cm. wide. 7 to 13 cm. long), lightly glaucous and sometimes rusty-woolly 

 beneath, ovate-lanceolate or elliptic, obtuse, often subcordate, slender-petioled, 

 entire or crenately few-toothed at end ; acorn oblong, about 10 mm. in diameter 

 and 20 mm. long, half included, the rounded cup with acute appressed scales. 

 " Encina " {Ramirez) . 



18. Quercus juergensenii ^ Liebm. Overs. Dansk. Vid. Selsk. Forh. 1854: 188. 

 1854. 



Quercus jurgensii A. DC. in DC. Prodr. 16 *: 78. 1864, 



Oaxaca; type locality. Chinantla. 



Apparently closely related to the preceding, with short-petioled, cuneate, 

 rather large leaves (4 cm. wide, 7 to 10 cm. long), and oblong acorns 15 mm. 

 in diameter and 20 to 25 mm. long. 



Not recently recognized. 



19. Quercus sororia Liebm. Overs. Dansk. Vid. Selsk. Forh. 1854: 175. 1854. 

 Oaxaca ; type locality, Chinantla. 



Twigs rather slender, glabrescent ; buds small, glabrous ; leaves deciduous, 

 moderate (4 cm. wide, 10 cm. long), slightly glaucous and exceptionally fleecy 

 beneath, elliptic-oblong, obtuse, rounded at base or subcordate, short-petioled, 

 entire ; acorn round-ovoid, 15 mm. in diameter and 20 mm. long, one-third 

 included, the rounded cup with thin, acute, rather loose scales. 



20. Quercus germana Cham. & Schlecht. Linnaea 5: 78. 1830. 



Veracruz and adjacent San Luis PotosI ; type locality, Jalapa, Veracruz. 



Deciduous tree with rather slender glabrous twigs ; leaves oblong, medium- 

 sized (4 cm. wide, 10 cm. long), rather obtuse, round-based, glabrous, slightly 

 glaucous beneath, short-petioled, crenately few-toothed at end ; acorn subglobose, 

 15 mm. in diameter, nearly included, the round cup with rather coarse keeled 

 acute appressed scales. 



* Little is known of Jiirgensen, who collected in Mexico for Galeotti, after 

 the latter left that country. His collections were obtained chiefly in the state of 

 Oaxaca. 



