THE CENTRAL AMERICAN SPECIES OF QUERCUS 23 



Alta Verapaz: mountains east of Tactic, on road to Tamahu, April 9, 1939, 

 Standley 71290 (F, USNA). Dept. Escuintla: Finca Monterrey, south slope of 

 Volcan de Fuego, February 5, 1939, Standley 64563 (F, USNA). 



HONDURAS. — Dept. Comayagua: El Achote, hills above plains of Siguatepe- 

 que, August 3, 1936, Yuncker, Dawson, and Youse 6297 (DeP, F, MBG, Mi, NY, 

 US [isotypes of Q. yousei]). 



COSTA RICA. — Prov. Alajuela: cataracts of San Ramon, February 20, 

 1931, Brenes 13437 (F). Prov. San Jose: vicinity of Santa Maria de Dota, 

 December 14-26, 1925, Standley 42425 and 42842 (F, US). 



Series Corrugatae Trel., Mem. Nat. Acad. Sci. 20: 44. 1924. 



Series Cyclobalanoideae Trel., Mem. Nat. Acad. Sci. 20: 44. 1924. 



Large trees with rather coarse glabrate twigs; buds round-ovoid; 

 stipules caducous; leaves moderate or large, deciduous or evergreen, 

 oblanceolate or lanceolate, coarsely incurved-serrate, glabrate, 

 evidently petiolate; fruit large, the scales much thickened basally, 

 acorns ovoid to oblong, cotyledons unequal. 



Range: Sierra Madre Oriental of Mexico to Costa Rica. 



Includes: Q. corrugata Hook, (type) and one species in the Sierra 

 Madre Oriental of Mexico. 



This series is distinguished from the other large-fruited groups by 

 its relatively long petioles and glabrous leaves with incurved or 

 antrorse teeth. 



6. Quercus corrugata Hook., Icones Plant. 5: pi. 403, 404- 1842. 



Quercus excelsa Liebm., Overs. Danske Vidensk. Selsk. Forhandl. 



1854: 174. 1854. 

 Q. corrugata var. microcarpa Wenzig, Jahrb. K. Bot. Gart. 



Berlin'2: 192. 1884. 

 Q. pilgeriana Seem en, Bui. Herb. Boissier, 2 ser., 4: 655. 1904. 

 Q. cyclobalanoides Trel., Proc. Amer. Philos. Soc. 54: 11. pi. 3. 



1915. 

 Q. reevesii Trel., Mem. Nat. Acad. Sci. 20: 45. pi. 22. 1924. 

 Q. corrugata var. granulijera Trel., Mem. Nat. Acad. Sci. 20: 45. 



pi. 24. 1924. 

 Q. corrugata var. ipalensis Trel., Mem. Nat. Acad. Sci. 20: 45. 



1924. 



Small or large tree, 6 to 20 m. tall. Twigs slender or coarse (often 

 on the same branch), 1.5 to 5 mm. thick, fluted, glabrous or from 

 sparingly strigose soon glabrescent, brown but soon becoming gray 

 with rather large pale lenticels. Buds about 3 mm. long, round-ovoid, 

 glabrous, grayish brown; the stipules caducous, about 10 mm. long, 

 ligulate, dorsally pubescent. Leaves deciduous, thick and rather 

 hard, 5 to usually 15 or even 25 cm. long, 2 to 5 or even 7 cm. broad, 

 lanceolate to oblanceolate or a broader form elliptic to obovate, acute 

 to attenuately acuminate and the ultimate apex narrowly rounded or 

 acute, basally cuneate to rounded, coarsely toothed with the teeth 

 abruptly directed forward and mucronate-tipped, entire toward the 

 base, margins minutely revolute or flat, both surfaces somewhat 

 shining, glabrous, old leaves somewhat bullate-granular above or 

 smooth; veins 12 to 14 or even 18 on each side, branching and more or 

 less obviously anastomosing but ultimately passing into the teeth 

 where those are present, minutely raised (including the reticulum) 

 above, more prominent beneath; petioles 15 to 40 mm. long or rarely 



