FLOWERING PLANTS AND FERNS OF ARIZONA 693 



7. Asclepias linaria Cav., Icon. PL 1: 42. 1791. 



Graham, Gila, Pinal, Cochise, Santa Cruz, and Pima Counties, 

 2,700 to 6,000 feet, common on dry rocky slopes and mesas, April to 

 August. Southern Arizona and Mexico. 



8. Asclepias quinquedentata A. Grav, Amer. Acad. Arts and Sci. 



Proc. 12: 71. 1876. 

 Huachuca Mountains (Cochise County), Santa Rita and Rincon 

 Mountains (Pima County), June to August. Western Texas to 

 southern Arizona. 



9. Asclepias brachystephana Engelm. in Torr., U. S. and Mex. Bound. 



Bot. 163. 1859. 

 Yavapai, Cochise, Santa Cruz, and Pima Counties, 3,500 to 5,000 

 feet, dry plains and mesas, May to August. Kansas and Wyoming 

 to Arizona and northern Mexico. 



10. Asclepias cutleri Woodson, Mo. Bot. Gard. Ann. 26: 263. 1939. 

 Near Rock Point, Apache County {Cutler 2111 , the type collection), 



27 miles west of Carrizo, Apache County {Peebles and Smith 13581), 

 about 5,000 feet, in sand, rare. Known only from northeastern 

 Arizona. 



11. Asclepias involucrata Engelm. in Torr., U. S. and Mex. Bound. 



Bot, 163. 1859. 



Apache County to Mohave County, south to Cochise, Santa Cruz, 

 and Pima Counties, 3,500 to 7,200 feet, common on dry plains and 

 mesas, sometimes with yellow pine, April to June. Southern Utah, 

 New Mexico, and Arizona. 



The extremely pubescent var. tomentosa Eastw. (A. macrosperma 

 Eastw.) is occasional in northern Arizona. 



12. Asclepias uncialis Greene, Bot, Gaz. 5: 64. 1880. 



White Mountains near Springeiville, Apache County (Ellis 9). 

 Wyoming to New Mexico and eastern Arizona. 



13. Asclepias nyctaginifolia A. Grav, Amer. Acad. Arts and Sci. 



Proc. 12: 70. 1876. 



Mohave County to Cochise, Santa Cruz, and Pima Counties, 1,500 

 to 5,000 feet, common on plains and mesas, often in sandy washes, 

 May to September. Arizona and southern California. 



Many of the Arizona specimens have been identified as A. longi- 

 cornu Benth. and A. lindheimeri Engelm. and Gray. 



14. Asclepias speciosa Torr., Ann. Lye, N. Y. 2: 218. 1828. 

 Apache, Navajo, Coconino, Greenlee, and Gila Counties, 6,000 to 



9,000 feet, mostly in open coniferous forests, June to August. Saskatch- 

 ewan to British Columbia, south to New Mexico and Arizona. 

 A large showy, coarse plant with dull-pink flowers. 



15. Asclepias hallii A. Gray, Amer. Acad. Arts and Sci. Proc. 12: 



69. 1876. 



Asclepias lonchophylla Greene, Leaflets 2: 231. 1912. 



San Francisco Peaks, Coconino County (Pwrpus 30, the type col- 

 lection of .1. lonchophylla). Colorado and northern Arizona. 



