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



2. Stylocline micropoides A. Gray, PL Wright. 2: 84. 1853. 



Northwestern Mohave County, and Maricopa, Pinal, Santa Cruz, 

 and Pima Counties, 500 to 4,000 feet, March to May. New Mexico 

 and Utah to southern California. 



33. EVAX 



Low, diffusely branched, white-woolly annual; leaves alternate, 

 small, oblanceolate or spatulate, entire; heads small, disciform, 

 clustered in bracted globose terminal glomerules; outer flowers pistil- 

 late, the inner (2 to 5) flowers hermaphrodite, infertile, all subtended 

 by flattish pales; pappus none. 



1. Evax multicaulis DC, Prodr. 5: 459. 1836. 



Filago nivea Small, Torrey Bot. Club Bui. 24: 333. 1897. 



Maricopa, Pinal, and Pima Counties, 1,500 to 2,500 feet, March to 

 May. Texas and Oklahoma to southern Arizona and northern 

 Mexico. 



34. FILAGO 



Low, whitish-woolly annuals ; leaves alternate, narrow, entire; heads 

 small, glomerate, disciform; outer flowers pistillate, the outermost of 

 these subtended by boat-shaped open pales, epappose, the others 

 usually without pales and with a pappus of capillary bristles; inner- 

 most flowers (2 to 5) hermaphrodite, usually without pales, pappose. 



Key to the species 



1. Plant diffuse, with very slender naked internodes, the leaves practically wanting 

 except for those subtending and conspicuously surpassing the heads; 

 flowers within the inner circle of pales mostly 4 or 5, all hermaphrodite. 



1. F. ARIZONICA. 



1. Plants erect or diffuse, the stems normally leafy at least below, the leaves 



subtending the heads only rarely surpassing the latter; flowers within the 



inner circle of pales about 12 to 20, only about 2 to 4 of them hermaphrodite 



(2). 



2. Plant diffuse or merely ascending; achenes all smooth; outer bracts with a 



hyaline appendage about as long as the body 2. F. depressa. 



2. Plant normally erect; inner achenes papillose; outer bracts with a hyaline 

 appendage about half as long as the body or less 3. F. californica. 



1. Filago arizonica A. Gray, Amer. Acad. Arts and Sci. Proc. 8: 652. 



1873. 

 Maricopa, Pinal, Pima, and Yuma Counties, 1,000 to 2,500 feet, 

 March and April, type from Verde Mesa (Smart in 1867). Southern 

 Arizona to southern California and northern Baja California. 



2. Filago depressa A. Gray, Amer. Acad. Arts and Sci. Proc. 19: 3. 



1883. 

 Maricopa, Pinal, and Pima Counties, 2,000 to 3,500 feet, March and 

 April. Southern Arizona to southern California. 



3. Filago californica Nutt., Amer. Phil. Soc. Trans, ser. 2, 7: 405. 



1841. 



Oglifa californica Kydb., Fl. Kocky Mount. 914. 1917. 



Fort Mohave (Mohave County), and southern Apache, Gila, 

 Maricopa, Pinal, and Pima Counties, 500 to 7,000 feet, March to May. 

 Southern Arizona to Utah and California. 



