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



5. Bidens tenuisecta A. Gray, Amer. Acad. Arts and Sci. Mem. 



ser. 2, 4: 86. 1849. 



Bidens cognata Greene, Leaflets 1: 149. 1905. 



Near Flagstaff (Coconino County) , Chiricahua Mountains (Cochise 

 County), Santa Catalina Mountains (Pima County), 6,000 to 8,000 

 feet, oak chaparral and open pine forests, July to October. Idaho to 

 western Texas, New Mexico, Arizona, and Chihuahua. 



6. Bidens lemmoni A. Gray, Syn. Fl. 1 2 : 297. 1884. 



Chiricahua and Huachuca Mountains (Cochise County) , Patagonia 

 Mountains (Santa Cruz County), Santa Rita Mountains (Pima 

 County), about 6,000 feet, September and October, type from 

 Apache Pass (Lemmon in 1881). Southern Arizona and Mexico. 



7. Bidens leptocephala Sherff, Bot. Gaz. 64: 22. 1917. 



Apache, Cochise, Santa Cruz, and Pima Counties, 5,000 to 6,000 feet, 

 mostly along streams, preferring shaded sandy soil, August to Oc- 

 tober, type from the Chiricahua Mountains (Blumer 1712). Western 

 Texas to Arizona, Chihuahua, and Baja California. 



8. Bidens heterosperma A. Gray, PL Wright. 2: 90. 1853. 



San Francisco Peaks, Coconino County (Knowlton 157), Chiricahua 

 Mountains, Cochise County (Harrison and Kearney 6193), Patagonia 

 Mountains, Santa Cruz County (Kearney and Peebles 10078), 6,000 

 to 8,000 (?) feet, September. Southern Colorado to New Mexico, 

 Arizona, and northern Mexico. 



9. Bidens ferulaefolia (Jacq.) DC, Prodr. 5: 603. 1836. 



Coreopsis ferulaefolia Jacq., PI. Hort. Schoenbr. 3: 65. 1798. 

 Bidens procera D. Don, Bot. Reg. 8: pi. 684. 1822. 



Chiricahua and Huachuca Mountains, Cochise County (Lemmon 

 in 1881, Wilcox 398), Sonoita Valley, Santa Cruz County (Rothrock 

 671), August and September. Southeastern Arizona to Guatemala. 



10. Bidens aurea (Ait.) Sherff, Bot. Gaz. 59: 313. 1915, as to 



synonym only. 90 



Coreopsis aurea Ait., Hort. Kew 3: 252. 1789. 



Bidens heterophylla Ortega, Hort. Matr. Dec. 99. 1798. 



Cochise, Santa Cruz, and Pima Counties, 4,000 to 6,000 feet, moist 

 sandy soil along streams, spring and autumn. Southern Arizona to 

 Guatemala; adventive or naturalized in France and Italy. 



The poorly distinguished var. wrightii (A. Gray) Sherff has nar- 

 rowly lance-linear leaves only 6 to 8 mm. w^ide, these entire or divided 

 into entire or subentire lance-linear lobes. 



76. COSMOS 91 



Slender annual; leaves opposite, dissected into narrow lobes; heads 

 medium-sized, terminal, the rays white or rosy, the disk yellow; in- 

 volucre double, as in Coreopsis and Bidens; achenes fusiform, slender- 

 beaked; pappus of 2 to 4 retrorse-hispid awns. 



Two species of cosmos, C. bipinnatus with white to crimson rays and 

 C. sulphureus with yellow rays, are common in cultivation. 



90 See Sherff, Earl Edward, studies in the genus bidens vii. Bot. Gaz. 81: 25-54. 1926. (See p. 42.: 

 ?i Reference: Sherff, E. E. revision of the genus cosmos. Field Museum Nat. Hist. Bot. Ser. 8) 

 401-447. 1932. 



