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



1. Zaluzania grayana Robins, and Greenm., Amer. Acad. Arts and 

 Sci. Proc. 34: 531. 1899. 



Gymnolomia triloba A. Gray, Amer. Acad. Arts and Sci. Proc. 

 17: 217. 1882. Not Zaluzania triloba Pers., 1807. 



Chiricahua and Huachuca Mountains, Cochise County (Lemmon, 

 Pringle, Wilcox), slopes and canyons, July to September, type of G. 

 triloba from the Chiricahua Mountains {Lemmon). Southwestern 

 New Mexico, southern Arizona, and Chihuahua. 



59. WYETHIA. Mules-ears 



Perennial herbs; leaves alternate, linear to oblong, entire or essen- 

 tially so ; heads large, terminal, solitary, yellow, radiate ; rays pistillate ; 

 achenes rather large, 3- or 4-angled; pappus a chaffy dentate crown, 

 or divided into a few teeth. 



Key to the species 



I. Leaves uniform, linear or lance-linear, sessile, 0.7 to 2.3 cm. wide, like the 

 stem harshly tuberculate-hispidulous or tuberculate-hispid; involucre 

 strongly graduate, the phyllaries with an ovate indurate base, abruptly 

 narrowed into a longer, very narrowly subulate, spreading, herbaceous tip. 



1. W. SCABRA. 



1. Leaves not uniform, mainly oblong or elliptic, at least the basal ones petioled, 

 3 to 9 cm. wide, pilose or hirsute but not tuberculate, and much larger 

 than those of the stem; involucre few-seriate, the phyllaries subequal, 

 oblong, oval, or ovate, not abruptly narrowed into a subulate spreading tip. 



2. W. ARIZONICA, 



1. Wyethia scabra Hook., London Jour. Bot. 6: 245. 1847. 

 Apache, Navajo (and probably Coconino) Counties, 5,000 to 6,000 



feet, fairly common on dry slopes and mesas, June to October. Wyo- 

 ming to east-central Utah, northwestern New Mexico, and northeastern 

 Arizona. 



A handsome but rather coarse plant with numerous stems from a 

 woody base. Said to be used as an emetic by the Hopi and Navajo 

 Indians, but they consider it dangerous. 



2. Wyethia arizonica A. Gray, Amer. Acad. Arts and Sci. Proc. 8: 655. 



1873. 

 Apache, Navajo, and Coconino Counties, 7,000- to 7,500 feet, slopes 

 and canyons mostly in pine forest, June to August, type from Bear 

 Springs (Palmer in 1869). Colorado, Utah, and northern New Mex- 

 ico and Arizona. 



60. TITHONIA 76 



Annual; leaves opposite below, alternate above, large, ovate, 

 toothed, petioled; heads rather large, solitary, radiate, orange yellow, 

 long-peduncled, the peduncle fistulose; rays neutral; achenes oblong, 

 thickened; pappus of 1 awn and several squamellae. 



1. Tithonia thurberi A. Gray, Amer. Acad. Arts and Sci. Proc. 8: 655. 



1873. 

 Patagonia Mountains (Santa Cruz County) to the Baboquivari 

 Mountains (Pima County), 3,000 to 4,000 feet, rich soil near streams, 

 locally abundant, August and September. Southern Arizona and 

 Sonora. 



™ Reference: Blake, S. F. revision of the genus tithonia. Contrib. U. S. Natl. Herbarium 20: 

 423-436. 1921. 



