FLOWERING PLANTS AND FERXS OF ARIZONA 935 



Key to the %pe\ 



1. Green, glandular-pubescent annual; leaves mostly oblong or ovate, toothed; 



pappus bristles not dilated at tip 1. P. camphorata. 



1. Silky-pubescent shrub; leaves linear to lanceolate, entire; pappus bristles 



dilated at tip, especially in the hermaphrodite flowers 2. P. sericea. 



1. Pluchea camphorata (L.) DC, Prodr. 5: 452. 1836. 



Erigeron camphoratum L., Sp. PL ed. 2. 1212. 1763. 



Bill Williams Mountain, Coconino County (Palmer in 1869), near 

 Phoenix, Maricopa County (Harrison and Kearney 220; , locally 

 abundant along the Gila River. Pinal County, in alluvial soil, Sep- 

 tember and October. Maine to Texas. Nevada, and California, south 

 to Mexico. 



Saltmarsh-fleabane. The plant has a strong, camphorlike odor. 

 The specific name P. camphorata is here used in the sense of Gray's 

 Manual, ed. 7. 68 



2. Pluchea sericea (Nutt.) Coville, Contrib. U. S. Natl. Herbarium 4: 



128. 1893. 



Polypappus sericeus Nutt., Acad. Nat. Sci. Phila. Jour. ser. 2, 



1: 178. 1848. 

 Tessaria borealis Torr. and Gray ex A. Gray, Amer. Acad. 



Arts and Sci. Mem. ser. 2,4: 75. 1849. 

 Berthelotia sericea Rydb., Torrey Bot. Club Bui. 33: 154. 1906. 



Almost throughout the State, up to 3,000 feet (seldom higher), very 

 abundant along streams, sometimes in saline soil, flowering chiefly in 

 spring. Texas to Utah, southern California, and northern Mexico. 



32. STYLOCLIXE 



Low woolly annuals; leaves alternate, linear or spatulate-linear, 

 entire; heads small, clustered, heterogamous, disciform; outer flowers 

 pistillate, with filiform corollas, each subtended by a pale, the 4 or 5 

 inner flowers hermaphrodite and infertile; pales of the pistillate flow- 

 ers boat-shaped, tipped with a hyaline appendage, completely inclosing 

 the achenes and deciduous with them; pales subtending the hermaph- 

 rodite flowers flattish; pappus none in the fertile flowers, a few 

 bristles in the hermaphrodite flowers. 



Key to the species 



1. Bracts enclosing the pistillate flowers with a narrow, only moderately woolly 

 body, this broadly hyaline-winged throughout its length. 



1. S. GXAPHALIOIDES. 



1. Bracts enclosing the pistillate flowers with a broader, densely long-woolly body 

 produced only at apex into an ovate hyaline appendage. 



2. S. MICROPOIDES. 



1. Stylocline gnaphalioides Nutt., Amer. Phil. Soc. Trans, ser. 2, 7: 

 338. 1840. 



Stylocline arizonica Coville, Biol. Soc. Wash. Proc. 7: 79. 

 "1892. 



Fort Mohave (Mohave County) and at several localities in Mari- 

 copa County, 500 to 1,500 feet, February to May. type of S. ariz<m lea 

 from Verde Mesa (Smart in 1867). California to Baja California and 

 Arizona. 



Gray, Asa. nsw manual or botany (ed : - p S19.) 



