386 PROCEEDINGS OF THE ACADEMY OF [1898. 



PORTULACACEiE. 



51. Talinum aurantiacum Engelm. in Bost. Jour. Nat. Hist., VI, (1850), 153 ; Biol. 



Centr. Amer. Bot., I, 78. 



Texas and New Mexico to North and South Mexico in sandy 

 places. Cerro de Guadalupe on rock faces, 7 Aug. 18 (106). 



52. Talinum patens Wilkl. Sp. PI., II, 863 ; Biol. Centr. Amer. Bot., I, 79. 

 North and South Mexico, also in South America, West Indies 



aud some of the Pacific Islands. Cerro de Guadalupe on rock 

 faces, Aug. 18 (109). 



GERANIACEiE. 



53. Oxalis decaphylla H. B. & K. Gen. et Sp., V, 238, t. 468; Biol. Centr. Amer. 



Bot., I, 163. 



Texas to North Mexico to South Mexico. This oxalid shows 

 great senstivity to light, in that its leaves assume the hot sun posi- 

 tion in the same manner in which they show nyctitropic, or sleep 

 movements. Each of the ten leaflets arranged at the end of the com- 

 mon petiole in a circular manner, first fold the two halves on each 

 side of the midrib back to back, and then they all fold down to- 

 gether like the closing of an umbrella. Cerro de Guadalupe, Aug. 

 18 (107). 



CACTACE.5J. 



54. Mammillaria strobiliformis Scheer ex Salm. Dyck. Cact. Hort. Dyck., ed. II, 



104; Biol. Centr. Amer. Bot., I, 524. 



Collected by Potts in Chihuahua. I refer the plant collected by 

 me doubtfully to this species. Cerro de Guadalupe, Aug. 18. 



BIGNONIACE^. 



55. Tecoma mollis H. B.K. Nov. Gen. et. Sp., Ill, 144; DC. Prodr., IX, 224; Biol. 



Centr. Amer. Bot., II, 496. 



North and South Mexico. Cerro de Guadalupe, Aug. 18. 

 E. Pedregal near Tlalpam. Valley of Mexico. 



6. Selaginella lepidophylla Sering. Monogr. Lycopod. II, 72 ; Biol. Centr. Amer. 

 Bot., Ill, 707. 



Texas through Mexico, southward to Peru. One of the so-called 

 resurrection plants. In normal grown condition, the leaves and 



7 See An Ecological Study of the Genus Talinum with Descriptions of Two 

 Species, Bull. Torrey Botan. Club, XXIV, p. 182, Apr., 1897, J. W. Harsh- 

 berger. 



