FLOWERING PLANTS AND FERNS OF ARIZONA 611 



5. Opuntia hvstricina Ensrelm. and Bigel. in Engelm., Amer. Acad. 



Arts and Sci. Proc. 3: 299. 1856. 



Apache County to Coconino County, 4,500 to 6,500 feet, common. 

 May and June, type from Coconino County. New Mexico and 

 Arizona. 



A form found in the vicinity of Navajo Bridge, Coconino County, is 

 characterized by extremely coarse, white spines and rather large 

 joints, but it may not be properly referable to 0. hystriciria. 



On sandy soil between Chinle and Ganado, Apache County, 

 0. hystricina has become pestiferous in its great abundance. In that 

 locality the yellow and pink color phases are equally represented. 



6. Opuntia ursina Weber in Bois, Diet. Hort. 189. 1899. 



Near Littlefield, Mohave County. 2.700 feet (Peebles SF 1007). 

 Southern Nevada, Arizona, and southeastern California. 



7. Opuntia erinacea Engelm. and Bigel. in Enselm., Amer. Acad. 



Arts and Sci. Proc. 3: 301. 1856. 

 Northern Apache County and Mohave County, 3,000 to 5,200 feet. 

 May and June. Southern Utah and Nevada, Arizona, and eastern 

 California. 



8. Opuntia rhodantha Schumann, Gesamtb. Kakteen 735. 1899. 

 Apache County to Mohave County, 4,500 to 7.200 feet, common, 



May and June. Western Nebraska, Colorado, Utah, and Arizona. 

 The flowers are prevailingly, possibly always, pink or apricot pink. 



9. Opuntia plumbea Rose, Smithsn. Inst. Misc. Collect. 50: 524. 



190s. 



Opuntia delicata Rose, Contrib. U. S. Natl. Herbarium 13: 



310. 1911. 

 Opuntia loomisii Peebles, Cactus and Succulent Jour. 9: 109. 



1938. 



Apache County to Mohave, Yavapai. Cochise, and Santa Cruz 

 Counties, 4,000 to 7,500 feet, common in juniper and pine forests, 

 May and June, type from Gila County, types of O. elelicata and 0. 

 loomisii from Santa Cruz and Yavapai Counties, respectively. New 

 Mexico and Arizona. 



The flowers are yellow when fresh, but in the afternoon often change 

 to shades of red or orange. 



10. Opuntia rafinesquei Engelm., Amer. Acad. Arts and Sci. Proc. 



3: 295. 1856. 



Opuntia cymochlla Engelm. and Bigel. in Engelm., ibid. 3: 



144. 1856. 

 Opuntia stenochila Engelm. and Bigel. in Engelm., ibid. 



Apache County to northern Mohave County, not common, 5.000 

 to 7,000 feet, May and June. Wisconsin to Texas, New Mexico, and 

 Arizona. 



11. Opuntia chlorotica Engelm. and Bi^el. in Engelm., Amer. Acad. 



Arts and Sci. Proc. 3: 291. 1856. 

 •Throughout most of the State, except in the northeastern quarter, 

 common, 2,000 to 6,000 feet, flowering in spring, type from Mohave 



