710 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



The trailing stems up to 3 m. long, long narrow entire leaves, 

 and large white, pink-throated corolla, make this species easily 

 distinguishable. 



3. Ipomoea thurberi A. Gray, Syn. Fl. 2 *: 212. 1878. 



Cochise, Santa Cruz, and Pima Counties, 4,000 to 5,000 feet, plains 

 and mesas, August and September, type from southern Arizona near 

 Santa Cruz, Sonora (Thurber 966). Southern Arizona and Sonora. 



Stems trailing, the purple flowers opening in the evening. 



4. Ipomoea egregia House, Torreya 6: 124. 1906. 



Ipomoea cuneifolia A. Gray, Amer. Acad. Arts and Sci. Proc. 19: 

 90. 1883. Not Meisn., 1869. 



Known only from the type collection in the Huachuca Mountains, 



Cochise County {Lemmon 2837), September. 



5. Ipomoea lemmoni A. Gray, Amer. Acad. Arts and Sci. Proc. 19: 



90. 1883. 

 Known only from the type collection in the Huachuca Mountains 

 {Lemmon 2840), August. 



6. Ipomoea muricata Cav., Icon. PL 5: 52. 1794. 



Ipomoea patens (A. Gray) House, N. Y. Acad. Sci. Ann. 18: 

 237. 1908. 



Cochise and Santa Cruz Counties, 5,000 to 6,000 feet, August and 

 September. New Mexico and southern Arizona to northern South 

 America. 



7. Ipomoea plummerae A. Gray, Syn. Fl. ed. 2, 2 l : 434. 1886. 

 Apache County to Coconino County, south to the Pinaleno Moun- 

 tains (Graham County) and Santa Catalina Mountains (Pima County) , 

 5,000 to 9,000 feet, mostly in coniferous forests, August and September, 

 type from Arizona {Lemmon 2839). Arizona and northern Mexico. 



Corolla pink, the tuber reported to be edible. 



8. Ipomoea tenuiloba Torr., U. S. and Mex. Bound. Bot. 148. 1859. 

 Chiricahua Mountains, Cochise County, 6,000 feet {Blumer 2138), 



September. Western Texas to southeastern Arizona and northern 

 Mexico. 



9. Ipomoea costellata Torr., U. S. and Mex. Bound. Bot. 149. 1859. 

 Yavapai County to Cochise, Santa Cruz, and Pima Counties, 3,500 



to 6,000 feet, common on dry grassy plains and mesas, July to October. 

 Western Texas to Arizona and Mexico. 



10. Ipomoea leptotoma Torr., U. S. and Mex. Bound. Bot. 150. 1859. 

 Cochise, Santa Cruz, and Pima Counties, 3,000 to 4,500 feet, com- 

 mon on dry grassy plains and mesas, August to October, type from 

 Sonora near the Arizona border. New Mexico, southern Arizona, 

 and Mexico. 



An attractive plant with rather large pink (seldom white) corollas, 

 apparently hybridizing occasionally with i". costellata. Specimens with 

 noticeably hirsute stems belong to var. wootoni Kelso, of which the 

 type was collected in the Santa Rita Mountains (Wooton in 1914). 



11. Ipomoea heterophylla Ortega, Hort. Matr. Dec. 1: 9. 1797. 

 Near Tombstone and Hereford (Cochise County), western slope of 



the Baboquivari Mountains (Pima County), 3,500 to 4,500 feet, 



