1898.] NATURAL SCIENCES OF PHILADELPHIA. 401 



158. Dahlia Merckii Lehrn. Delect. Sem. Hort. Hainb., 1839 ; ex Linnsea, XIV, 



(1840) Litt., 130. 



La Cima, pedregal, Aug. 18 (118, see ante). 



159. Gnaphalium Bourgovii A. Gray in Proc. Amer. Acad., XIX, (1883) 3. 



The plant is questionably referred to this species. South Mexico. 

 A plant resembling G. cheiranthifollum Lam. La Cima, in railroad 

 cut below the town. Aug. 18 (121). 



J. Salazar and Sierra de las Cruces. 



A brief description of this region is given in the introductory geo- 

 graphical portion. The region is one of great exposure to trying 

 and cold winds, we, therefore, find a more truely alpine flora than 

 at La Cima, although the elevations are about the same. This 

 accounts for the presence at Salazar of low, cespitose, or dwarfed 

 species. 



A ditch along the railroad before reaching Salazar afforded many 

 interesting plants. Las Cruces Valley, the scene of the battle in 

 1810 between Hidalgo and the Spaniards resulting in a victory for 

 the patriots, yielded a great variety of plants. The level of the 

 mountain meadows composing the valley is about 10,000 feet altitude. 

 Many cold springs, render the district fine botanizing ground. 



FILICES. 



160. Polypodium heteromorphum Hook, et Grew Ic. Fil., t. 108 ; Biol. Centr. 



Amer. Bot. Ill, 660. 



Sides of ditches, Salazar, Sierra de las Cruces. Extending from 

 South Mexico to Colombia and Ecuador. Aug. 13 (59). 



GRAMINEJE. 



161. Brachypodium Mexicanum Linn. Hort. Berol., I, 41 ; Biol. Centr. Amer. Bot., 



Ill, 58L 



North Mexico, region of San Luis Potosi (Virlet D'Aoust) ; South 

 Mexico, Chapultepec and Tacubaya (Schaffner) ; Chinantla, San 

 Felipe, (Liebmann). 



Salazar, 10,000 feet, Sierra de las Cruces, Aug. 13 (32). 



ERIOCAULONACE M. 



162. Eriooaulon sp. 



Boggy places, Salazar, Sierra de las Cruces, 10,000 feet, Aug. 13 

 (50). 



