THE CENTRAL AMERICAN SPECIES OF QUERCUS 51 



axils of the principal veins; veins 9 to 15 on each side and often with 

 evanescent intermediates, repeatedly branching and anastomosing, 

 raised above, more prominently so beneath, the reticulum very slightly 

 raised on both surfaces; petioles 2 to 5 mm. long, 1.5 to 2 mm. thick, 

 very dark red in color, from sparsely buff-tomentose glabrate. Stami- 

 nate catkins 4 to 6 cm. long, moderately closely flowered, nearly gla- 

 brous or sparsely puberulent, the apiculate anthers little exserted. 

 Pistillate catkins? Fruit annual, rather small, solitary or paired on a 

 peduncle 4 to 7 or 8 mm. long; cups shallowly cup-shaped to deeply 

 saucer-shaped, 12 or 13 mm. broad, 4 to 6 mm. high, round or flat at 

 base, the scales ovate, broadly rounded, flat and very tightly appressed, 

 puberulent or the apices glabrate and dull brown; acorns 12 to 15 mm. 

 long, 11 to 13 mm. broad, ovoid, obtuse, from minutely puberulent 

 glabrate and light brown, about one-fifth or one-fourth included; 

 abortive ovules apical. (See pis. 66 and 67.) 



Range: Mountains of Chiapas, Mexico. 



Quercus duratijolia is not very closely related to the other species 

 of the series Aristatae, but even so, in so nondescript a group it is diffi- 

 cult to hit upon distinguishing characters. Its very highly polished 

 upper leaf surface, although only a comparative difference, is probably 

 the most dependable. Its usually cordate leaf bases and larger, 

 flatter mature cups aid in separating it from Q. sapotaefolia with which 

 it is most apt to be confused. The usually waxy -glaucous under leaf 

 surface of Q. sapotaefolia is diagnostic but not always evident. The 

 acuminate and impressed- veiny leaves of Q. hondurensis and Q. 

 eugeniaefolia distinguish them adequately. 



Specimens examined: 



MEXICO.— Chiapas: Mount Ovando, April 5, 1936, Matuda 65, 289, and 857 

 (Mi); April 9-12, 1937, Matuda 1827 (AA [type], Mi); December 1937, Matuda 

 2073 (Mi, US, USNA); Matuda 2102 (Mi, USNA) ; Buena Vista, Escuintla, 

 January 1938, Matuda 1873 (Mi, USNA). 



26. Quercus sapotaefolia Liebm., Overs. Danske Vidensk. Selsk. 

 Forhandl. 1854: 185. 1854. 



Quercus microcarpa Liebm., Overs. Danske Vidensk. Selsk. For- 

 handl. 1854: 184. 1854. Not Q. microcarpa Lapeyrouse, 

 Hist. Abr. PL Pvr. 582. 1813; nor de Morogues, Mem. Soc. 

 Agr. d'Orleans 50: 51. 1877. 



Q. elliptica microcarpa A. DC. in DC. Prodr. 16 2 : 71. 1864 

 (pro parte — as to Guatemala). 



Q. gualimalensis A. DC. in DC. Prodr. 16 2 : 78. 1864 (pro 

 parte — detached fruit of the type only). 



Q. parviglans TreL, Proc. Amer. Philos. Soc. 54: 8. 1915. 



Q. parviglans f. polycarpa TreL, Mem. Nat. Acad. Sci. 20: 152. 

 pi. 299. 1924. 



Q. parviglans f. tejadana TreL, Mem. Nat. Acad. Sci. 20: 152. 

 1924 (not illustrated). 



Q. apanecana TreL, Mem. Nat. Acad. Sci. 20: 152. 1924 (not 

 illustrated) . 



Q. correpta TreL, Mem. Nat. Acad. Sci. 20: 153. pi. 300. 1924 

 (pro parte — -detached fruit of the type only). 



Q. donnell-smithii TreL, Mem. Nat. Acad. Sci. 20: 162. 1924 

 (pro parte — type only) . 



