THE CENTRAL AMERICAN SPECIES OF QUERCUS 49 



Quercus irazuensis is possibly closely related to Q. rysophylla 

 Weatherby of northeastern Mexico, from which it is distinguished by 

 its pubescence and smaller leaves with shorter apices and merely 

 subcordate bases. Because the fruit of Q. irazuensis is unknown, 

 this point is not assured. Certain forms of Q. costaricensis are difficult 

 to distinguish from Q. irazuensis. The distinction is discussed under 

 Q. costaricensis. 



Specimens examined: 



COSTA RICA.— Cerro de la Muerta, June 27, 1932, Stork 3052 (F). Pro v. 

 San Jose: Cerro de las Vueltas, December 29, 1925- January 1, 1926, Standley 

 and Valerio 43752, 43789, and 43972 (F, US). Prov. Cartago: Volcan Irazu, 

 June 24, 1874, Kuntze 2844 (NY [type]). 



Series Aristatae TreL, Mem. Nat. Acad. Sci. 20: 139. 1924. 



Series Perseaefoliae TreL, Mem. Nat. Acad. Sci. 20: 148. 1924. 

 Series Parviglandes TreL, Mem. Nat. Acad. Sci. 20: 151. 1924. 

 Series Eugeniaejoliae TreL, Mem. Nat. Acad. Sci. 20: 161. 1924. 



Medium-sized trees; twigs slender or rather thick, persistently 

 tomentose or glabrate; buds ovoid to fusiform; leaves medium - 

 sized, elliptic-obovate to lanceolate, entire or mucronate- or aristate- 

 toothed, glabrous above, glabrate beneath, the veins finely raised 

 above, rather prominent beneath, the lamina smooth and often waxy- 

 glaucous beneath, petioles short or moderately long; fruit annual, 

 small, the scales thin, appressed, and tomentose. 



Range: Sierra Madre Occidental of Mexico, Chiapas, Guatemala, 

 El Salvador, and Honduras. 



Includes: Q. hondurensis TreL, Q. duratifolia C. H. Mull., Q. sapo- 

 taejolia Liebm., Q. eugeniaejolia Liebm., and several Mexican species of 

 which Q. aristata Hook, and Arn. is the type. 



The very close relationship of Q. hondurensis, Q. sapotaefolia, and Q. 

 eugeniaejolia scarcely allows separate series for the latter two species. 



24. Quercus hondurensis TreL, Mem. Nat. Acad. Sci. 20: 140. 

 pi 266. 1924. 



Quercus comayaguana TreL in Standley, Journ. Arn. Arb. 11: 



25. 1930. 

 Q. guayabalana TreL in Standley, Field Mus. Bot. Ser. 8: 6. 



1930. 

 Q. yoroensis TreL in Yuncker, Field Mus. Bot. Ser. 9: 282. 1940. 

 Q. yoroensis var. aguanana TreL in Yuncker, Field Mus. Bot. 



Ser. 9: 282. 1940. 



Medium-sized or large tree. Twigs 2 to 3 or 4 mm. thick, somewhat 

 fluted, persistently yellow- or buff-velvety-tomentose, the second 

 season hoary, dark reddish brown where denuded, lenticels not or 

 scarcely discernible. Buds about 5 mm. long, broadly fusiform, 

 apparently glabrous; stipules caducous. Leaves evergreen, 8 to 

 usually 12 or 14 or even 18 cm. long, 3 to usually 5 or 6 cm. broad, 

 lance-elliptic, oblong, or oblanceolate, obtuse to usually acute or 

 acuminate or rarely rounded at apex, arist ate- tipped or not, cordate 

 or merely rounded at base, entire or slightly wavy and usually 

 markedly crisped, margins minutely or coarsely revolute, upper sur- 

 face somewhat shining, from minutely stellate- pubescent soon gla- 

 brate, but the midrib persistently tomentose, lower surface similar, 



