September 3<^. 191 1 79 



HORSFORDIA Newberrvi Gray, Froc. Am. Acad. 2"^: 297. 

 Rocky ravines at Toros, Colorado desert, April, 1880, Par- 

 j's/i 200. 



Opuntia chlorotica Eng^elm. & Bigel. 

 Notable for its solitary, tall and erect habit of growth. Not 

 rare, but seldom abundant, on the desert slopes of the mountains, 

 at 4000 to 5000 feet altitude. San Felipe, Palm canyon, Mor- 

 ongo King mine. Parish; McHauey's mine, Alverson. Provi- 

 dence mountains according to Brandegee, Zoe 5: 49. 



Opuntia axgustata Engelm. & Bigel. ex Engelm. Proc. Am. 

 Acad. 3: 292. 

 Northeastern slope of the San Bernardino mountains from 

 Rattlesnake canyon to Bairdstovvn, at the upper end of Bear val- 

 ley, at 5000 to 7000 feet altitude. At the highest point of this 

 range there is a commingling of the Upper Sonoran and Tran- 

 sition vegetation, and in winter the temperature is low, and 

 there is considerable snow fall. The type range is "from Zuni, 

 west of the Rio Grande, westward to the Cajon Pass in the Cal- 

 ifornia mountains." I refer the plants to this species with hesi- 

 tation, and they may be of an undescribed species. 



Opuntia hystricina Engelm. & Bigel. 

 Ivanpah, in the Mojave desert, Parish. 



Opuntia ursina Weber in Bois, Diet. Hort. S69. 

 Ord mountains, Mojave desert, Ah'erson. The type speci- 

 mens were collected at this station. 



Opuntia Parryi Engelm. Am. Journ. Sci. II. 14: 339. 

 McHaney's mine, near Seven Palms, 1895, Alverson. 



Opuntia basilaris Engelm. & Bigel. var. ramosa Parish, Bull. 

 Torr. Club 19: 92. 

 Common on both deserts: Whitewater, Palm Springs, Rab- 

 bit Springs. Also in the Cismontane: San Jacinto plains, San 

 Timoteo pass, and San Bernardino valley, where it is very in- 

 frequent. The species occurs at the head of Cajon pass. 



Opuntia rutila Nutt. in Torr. & Gray, Fl. N. Am. 1: 555. 

 Providence mountains, according to Brandegee, Zoe 5: 49. 



