22 MISC. PUBLICATION 4 7 7, TJ. S. DEPT. OF AGRICULTURE 



HONDURAS. — Dept. Comayagua: summits near El Achote above Siguatepe- 

 que, July 28, 1936, Yuncker, Dawson, and Youse 6180 (DeP, F, 111 [type of Q. 

 yunckeri], MBG, Mi). 



COSTA RICA.— Cerro Jucosal, March 3, 1928, Stork 1129 (F). Prov. 

 Cartago: near Finca Las Concavas, December 7-8, 1925, Standley 4.14.59 (US); 

 Dulce Nombre, February 27, 1924, Standley 35958 (US); El Mufieco, south of 

 Navarro, February 8-9, 1924, Standley 33869 (US); March 6-7, 1926, Standley 

 and Torres 51147 (US); Standley and Torres 51270 (F, US); vicinity of Orosi, 

 March 30, 1924, Standley 39798 (US). Prov. San Jose: Cerro de Piedra Blanca. 

 above Escasu, January 31, 1924, Standley 32619 (F, US). Prov. Alajuela: near 

 San Ramon, peaks of hills of Tremedal, April 10 and Mav 10, 1913, Tonduz 17693 

 (F, US [2]); vicinity of Fraijanes, February 12-13, 19*26, Standley and Torres 

 47424 (F, US); Palmira, July 1, 1941, A. Smith 2878 (USNA). 



PANAMA. — Prov. Chiriqui: valley of upper Rio Chiriqui Viejo, vicinity 

 of Monte Lirio, June 27- July 13, 1935, Seibert 317 (MBG, NY); Distr. Boquete, 

 Bajo Mono, April 3, 1938, Davidson 497 (F, MBG); Boquete to Finca Lerida, 

 April 4, 1937, Allen 303 (MBG, USNA); Finca Lerida to Pefia Blanca, July 9, 

 1940, Woodson and Schery 286 (USNA). 



5. Quercus pilarius Trel., Mem. Nat. Acad. Sci. 20: 44. pi. 19. 

 1924. 



Quercus yousei Trel. in Yuncker, Field Mus. Bot. Ser. 17: 358. 

 1938. 



Small or large tree. 4 to 25 m. tall. Twigs slender (1 to 2 mm.), 

 fluted, from sparingly pilose and brown quickly glabrate and gray 

 with a few scarcely prominent lenticels. Buds subglobose, about 3 

 mm. long, glabrate or the scales ciliate; stipules caducous or persist- 

 ent, 5 to 7 mm. long, spatulate-ligulate, light brown and appressed- 

 sericeous or glabrous. Leaves evergreen, moderately thick and hard, 

 6 to 24 (usually about 15) cm. long, 2.5 to 7 (usually about 4) cm. 

 broad, lanceolate or oblanceolate, attenuately acute (or the ultimate 

 apex minutely obtuse), basally cordulate or cuneate, coarsely crenate- 

 serrate above the middle, the teeth abruptly directed forward, mu- 

 cronate-tipped, margins minutely revolute or flat, both surfaces 

 somewhat shining, appearing in juvenile form with the midrib and 

 veins appressed-sericeous but quickly glabrate and at maturity entirely 

 glabrous or the midrib slightly pubescent; veins about 12 to 15 on each 

 side, very irregular and with occasional evanescent intermediates, 

 much branched and obviously anastomosing but ultimately passing 

 into the teeth where those are present, slightly raised above (including 

 the reticulum) and quite prominent beneath; petioles very short (1 to 

 3 or rarely 4 mm.), much thickened at the base, glabrate. Flowers 

 and fruit? (See pis. 12 and 13.) 



Range: Chiapas, Guatemala, Honduras, and Costa Rica (1,150 to 

 2,400 m.); the type from Tapachula, Chiapas, Mexico (Reeves 11). 



Quercus pilarius is distinguished from Q. oocarpa, the only species 

 to which it is at all closely related, by its slender glabrate twigs and 

 its thick and firm leaves glabrous at maturity. 



Specimens exaznined: 



MEXICO.— Chiapas: Copainala, August 1940, Martinez 390 (USNA). 



GUATEMALA.— Chinkabal, September 1939, Lewis without number (F). 

 Dept. San Marcos: Barranco Emenencia, above San Rafael Pie de la Cuesta, 

 March 14-15, 1939, Standley 68686 (F) ; Finca El Porvenir, Volcan Tajumulco, 

 March 12, 1940, Steyermark 37570 (F, USNA). Dept. Quezaltenango: Finca 

 Pireneos, below Santa Maria de Jesus, March 11, 1939, Standley 68360 and 

 68374 (F) ; Rio Samala, near Santa Maria de Jesus, January 25, 1941, Standley 

 84631 and 84747 (USNA). Dept. Suchitepequez: Volcan Zunil, near Finca 

 Las Nubes, east of Pueblo Nuevo, February 2, 1940, Steyermark 35448 (F) . Dept. 



