1898.] NATURAL SCIENCES OF PHILADELPHIA. 381 



ica, but supposed to have been originally introduced by the Span- 

 iards. Collected by botanists in several places. Tlalpam fields, 

 Aug. 20 (183). 



ANACARDIACE^l. 



18. Schinus molle Linn. Sp. PI., 3S8 ; Lam. 111., t. 822 ; Biol. Cent. Am. Bot., I, 221. 



Dispersed from country to country by the birds tzenzontles and 

 xilgueros, which eat the fruit and void the seeds. Found in Tropi- 

 cal America to South Brazil, occurring in the Andes at 12,000 to 

 13,000 feet. Supposed to have been introduced by the early Span- 

 iards in order to procure wood in the volcanic district (Christy). 

 Will bear droughts and the intense summer heat of Central Austra- 

 lia better than almost any introduced plant (Von Mueller). The 

 plant, which flowers from March to May in Mexico, occurs in the 

 Valley on the pedregal in saline soils, fertile soils and along the mar- 

 gins of Lake Texcoco. " El Arbol de Peru " ; " Pelonquahuitl " ; 

 "Copalquahuitl" ; "Molle"; " Pimientade America." Roadsides 

 near Tlalpam, Aug. 15 (84). 



MALVACEAE. 



19. Sphaeralcea angustifolia G. Don. Gen. Syst., I, 465 ; Biol. Centr. Amer. Bot., 



I, 113. 

 Malva angustifolia Cav. Diss., I, 64, t. 20; Bot. Mag., t. 2,839. 

 Sphaeroma angustifolium Schl. in Linnsea, XI, 353. 



Widely distributed in Mexico according to the collections of botan- 

 ists. Tlalpam, Aug. 20 (181). 



LYTHEACE53. 



20. Cuphea sp. 



Near ditches. Tlalpam, Aug. 15 (85). 



21. Lythrum alatum Pursh. Fl. Am. Sept., I, 334; Biol. Cent. Am. Bot., 1,447. 

 From Canada southward, chiefly in the eastern and southern 



States to South Mexico. Roadsides near Tlalpam, Aug. 15 (87). 



ONAGRACEiE. 



22. (Enothera rosea [Soland. in] Ait. Hort. Kew., ed. I, ii, 3. 



(Repeated). Tlalpam, Aug. 20 (172). 



PRIMULACE.ffiJ. 



23. Anagallis arvensis Linn. Sp. PI., 148; Biol. Centr. Amer. Bot., II, 289. 



A widely dispersed Old World plant naturalized, and common in 

 some parts of Mexico (Hemsley). Tlalpam, Aug. 22 (no number). 



