no STUDIES IN GEOLOGY, No. i 



wings with less frequently anastomosing veins. It. is com- 

 parable to various two-winged modern species of Asia, 

 Africa, and the South American Tropics east of the Andes. 



GAMOPETAIJE 



Order ERIC ALES 



Family ERICACE^ 



Genus Vaccinium LINNE 



Vaccinium pontzuelum sp. nov. 



PLATE VII Fig. 6. 



Description. Leaves of small size, spatulate or obovate 

 in general outline, with a broadly rounded tip and narrowly 

 cuneate base. Margins entire, slightly revolute. Texture 

 coriaceous. Length about 1.25 cm. Maximum width, 

 above the middle, about 4 mm. Petiole missing, appears 

 to have been short and stout. Midrib extremely stout and 

 prominent on the under side of the leaf. Secondaries are 

 obsolete, but whether by immersion in the leaf substance 

 or because of the pilose under surface of the leaf cannot 

 be determined with certainty. 



The Ericaceae have a considerable representation in the 

 existing flora of South America and there are at least 

 ten different genera and a large number of species in the 

 Andean region some of which range throughout the whole 

 length of the continent, and one, Pernettya, reaching 

 altitudes of 14625 feet in the equitorial portion of the 

 range. 



The genus Vaccinium with a number of little under- 

 stood species reaches altitudes of 10725 feet in central Peru 

 almost under the equator but presumably is confined to 

 lower levels in the latitude of Corocoro. In general the 

 present Andean Ericaceae are Eastern Cordillera or Mon- 

 tana species rather than interandean. 



