THE CENTRAL AMERICAN SPECIES OF QUERCUS 63 



onymy, Q. tristis has an abundance of leaf forms which seem dependent 

 variously upon growth conditions, degree of maturity, etc., and 

 exhibit no fundamental differences. Even the question of whether 

 Q. tristis may legitimately be held distinct from the central Mexican 

 Q. castanea Nee is a problematic one. It seems that the Guatemalan 

 population, as represented by an abundance of herbarium specimens, 

 has a different aspect and a different range of variation from a similar 

 representation of Q. castanea. It is doubtful that the persistence of 

 the tomentum on the under leaf surfaces of Q. castanea would serve 

 alone to distinguish it from Q. tristis in which a similar tendency is 

 seen. The problem needs a field study of the two populations and a 

 careful search of the intervening area. 



Specimens examined: 



MEXICO.— Chiapas: Copainala, February 1939, Martinez 372 (USNA) ; 

 Cintalapa, February 1939, Martinez 376 (USNA). 



GUATEMALA. — Without legible locality or date, Skinner without number(NY). 

 Dept. Huehuetenango: near Huehuetenango, April 1921, "Leg. Estadistica" 

 [Tonduz] 461 (US); without exact locality, September 3, 1934, Skutch 1105 (AA, 

 F, 111); Rio Pucal, February 20, 1939, Standley 65824 (F, USNA); Standley 65827 

 (F); Rio Pucal, 14 km. south of Huehuetenango, January 4, 1941, Standley 82253, 

 82256, and 82315 (USNA); near ruins of Zaculeu, January 8, 1941, Standley 

 82765 (USNA) ; near Puente de Xinaxo, 13 km. west of Huehuetenango, December 

 30, 1941, Standley 81545 (USNA). Dept. San Marcos: barrancas on slopes of 

 Volcan Tejumulco, 6 miles southwest of Tejumulco, February 26, 1940, Steyermark 

 36623 (F, USNA). Dept. Quezaltenango: Volcan Santa Maria, May 8, 1937, 

 Muenscher 12493 (F) ; Volcan Santa Maria, above Santa Maria de Jesus and Las 

 Mojadas, January 12, 1940, Steyermark 33938 (F, USNA); Rio Samala below 

 Zunil, January 24, 1940, Steyermark 34968 and 34982 (F) ; Steyermark 34970 

 (F, USNA). Dept. Chimaltenango: Alameda, September 30, 1937, Johnston 

 997 (F) ; Barranco de la Sierra, southeast of Patzum, December 31, 1938, Standley 

 61627 (F, USNA); between Chimaltenango and San Martin de Jilotepeque, 

 November 25, 1938, Standley 57918 (F, USNA); December 22, 1940, Standley 

 80895 (USNA) ; Rio Guacalate, southeast of Chimaltenango, December 14-23, 

 1940, Standley 81072 (USNA) ; near Rio Pixcavo, between Chimaltenango and 

 San Martin de Jilotepeque, February 3, 1939, Standley 64372 and 64487 (F, USNA). 

 Dept. Guatemala: near Guatemala, July 1860, Hayes without number (AA, 

 G[5]); Finca El Naranjo, February 1923, Salas 203 (US); near Finca La Aurora, 

 1938-1939, Aguilar 211, 242, and 243 (F) ; Volcan Pacava, about Las Calderas, 

 November 30, 1938, Standley 58311 (F, USNA). Dept. Sacatepequez: near 

 Antigua, November 1938-February 1939, Standley 61696 and 61753 (F, USNA); 

 Cuesta de las Canas, above Antigua, December 6, 1938, Standley 58886 (F[2], 

 USNA) ; Cerro de la Cruz, above Antigua, January 22, 1939, Standley 63304 (F, 

 USNA) ; Finca El Hato, northeast of Antigua, December 28, 1938, Standley 

 61248 (F); Standley 61224 and 61252 (F, USNA); hills of Finca Carmona, south- 

 east of Antigua, January 27, 1939, Standley 63675 and 63741 (F, USNA); between 

 Mixco and Antigua, April 16, 1915, Trelease 31 (111 [type of f. mixcoensis]) ; Rio 

 Guacalate, between Antigua and Chimaltenango, December 23, 1940, Standley 

 80982 (USNA); between Mixco and Santa Lucia, April 16, 1915, Trelease 56 

 (111 [2]); Trelease 57 (111 [2]); April 15, 1915, Trelease 58, (111 [4]); near San Lucas, 

 October 21, 1916, Popenoe 685 (US, USNA); Volcan Acatenango, February 20, 

 1905, Kellerman 4833 (US); Volcan de Agua, north of Santa Maria de Jesus, 

 December 10. 1938, Standley 59440 (F[2], USNA); barranco above Duefias, 

 January 21, 1939, Standley 63134 and 63183 (F, USNA); near Pastores, December 

 14, 1938, Standley 59900 and 59953 (F, USNA); above Pastores, December 23, 

 1938, Standley 60756 (F, USNA [2]). Dept. Amatitlan: Lake Amatitlan, 

 February 2, 1906, Kellerman 6563 (F) ; Las Cachiplanas, Volcan Pacava, April 4, 

 1921, Tonduz 458 (US). Dept. Jalapa: Volcan Jumav, north of Jalapa, Decem- 

 ber 1, 1939, Steyermark 32422 (F[2]); Steyermark 32425 and 32430 (F) ; north of 

 Jalapa toward La Laguna, November 11, 1940, Standley 76907 (USNA); Cerro 

 Alcoba, east of Jalapa, December 2, 1939, Steyermark 32543 and 32601 (F, USNA) ; 

 Montana Durazno, 2 miles east of San Pedro Pinula, December 10, 1939, Steyer- 

 mark 32995 (F, USNA). Dept. Chiquimula: Rio Taco, between La Laguna 

 and Chiquimula, October 27, 1939, Steyermark 30730 (F) ; Volcan Nube (Montana 



