1898.] NATURAL SCIENCES OF PHILADELPHIA. 389 



from Panama, Costa Rica, Nicaragua, Guatemala and Mexico. The 

 two leaflets usually assume the bot sun position standing up verti- 

 cally back to back. When the plant is in flower, these serve to en- 

 close the blossom. 



Pedregal on exposed lava in rosettes, Aug. 20 (167). 



73. Eysenhardtia amorphoides H. B. & K. Nov. Gen. et Sp., VI, 489 t. 592. 

 From New Mexico, Texas, through North to South Mexico. 



" Palo dulce bianco ; " " Coatle." Used as a succedaneum for san- 

 dal-wood. Pedregal, Aug. 22 (1 97). 



74. Crotalaria pumila Orteg. Hort. Matr., 23 ; Biol. Centr. Amer. Bot., I, 228. 



From New Mexico to South Mexico. Pedregal, Aug. 22 (217). 



75. Phaseolus sp. 

 Pedregal, Aug. 22 (212). 



EUPHORBIACE.SJ. 



76. Acalypha phleoides Cav. in Anal. Hist. Nat. Madr., II (1800) 139 ; Biol. Centr. 



Amer. Bot., Ill, 127. 



Abundant in two varieties through Mexico, The plant collected 

 in 1896 in the Valley of Mexico is doubtfully referred to this spe- 

 cies. Pedregal, Aug. 22 (203). 



77. Euphorbia adenoptera Bertol. Misc. Bot., Ill, 20, t. 23 ; DC. Prod., XV, 2, 49. 

 Distributed from Florida, Texas, New Mexico to South Mexico, 



West Indies and South America. Doubtfully referred by me to 

 this species. Pedregal, Aug. 22 (202). 



SAPINDACEJE. 



78. Cardiospermum Halicacabum Linn. Sp. PI. 366; Biol. Cent. Am. Bot., I, 209. 

 A very common plant in tropical and subtropical regions of both 



hemispheres. It was difficult for me to distinguish my plant from 

 C. molle, which it closely resembles. North and South Mexico. 

 Pedregal, Aug. 20, climbing over other plants (159). 



MALVACEAE. 



79. Malvastrum Peruvianum A. Gray. Bot. U. S. Explor. Exped., I, 146; Biol. 



Centr. Amer. Bot., I, 99. 



Pedregal, Aug. 22 (224). 



CAOTACEiB. 



80. Cereus serpentinus DC. Prodr. Ill, 467 ; Biol. Centr. Amer. Bot., 546 ; Bot. 



Mag., t. 35,66. 



South Mexico, used occasionally for forming hedges. Pedregal, 

 Aug. 22. 



