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



is known from Navajo County (Wetherill 49Q) , and from the Kaibab Pla- 

 teau, Coconino County, 6,000 feet (Jones 6063g). The commonest form 

 in Arizona is var. stenophyllus (A. Gray) H. M. Hall (C. stenophyllus 

 (A. Gray) Greene), a low shrub 10 to 30 cm. high, glabrous and with 

 narrowly linear leaves 1 mm. wide or less, known from Apache, 

 Navajo, and Coconino Counties, 5,000 to 6,000 feet, dry mesas and 

 slopes, August to October. The var. elegans (Greene) Blake (C. 

 elegans Greene, C. viscidiflorus subsp. elegans Hall and Clements) is 

 reported by Hall and Clements from the Grand Canyon, Coconino 

 County (Allen in 1887). It is more or less hirtellous and is chiefly 

 distinguished by the thickened green tips of the phyllaries. Collec- 

 tions from 20 miles west of Cameron, Coconino County, 6,300 feet 

 (Kearney and Peebles 12813), and from Canaan ranch, Kaibab Pla- 

 teau, 5,000 feet (Jones 6066d), appear to belong to it. The var. 

 molestus Blake, evenly but not densely hispidulous with conical hairs, 

 in part glandular-capitate, on the stem and leaves, with linear leaves 

 1 to 1.8 cm. long and about 1 mm. wide, and merely glandular achenes 

 (these densely pubescent in all the other forms), is known only in 

 the vicinity of the San Francisco Peaks, Coconino County (Hall 11199, 

 type; Hall 11184; A. D. Read 165). 



6. Chrysothamnus green ei (A. Gray) Greene, Erythea 3 : 94. 1895. 



Bigelovia greenei A. Gray, Amer. Acad. Arts and Sci. Proc. 11: 

 75. 1876. 



Represented in Arizona by Y&v.filifolius (Rydb.) Blake (C. laricinus 

 Greene, C.filtfolius Rydb., (7. greenei subsp . jilijolius Hall and Clem- 

 ents), with leaves less than 1 mm. wide and usually only 1 to 2 cm. 

 long. Apache, Navajo, and Coconino Counties, 5,000 to 7,000 feet, 

 sandy or stony plains and mesas, July to October, type of C. laricinus 

 from the Hopi Reservation-Little Colorado River region (Hough 33). 

 Colorado to Nevada, New Mexico, and northeastern Arizona. 



7. Chrysothamnus parryi (A. Gray) Greene, Erythea 3: 113. 1895. 



Linosyris parryi A. Gray, Acad. Nat. Sci. Phila. Proc. 1863: 

 66. 1863. 



The species with its varieties ranges from Wyoming and Nebraska 

 to New Mexico, Arizona, and California. The Arizona form is var. 

 nevadensis (A. Gray) H. M. Hall (C. nevadensis (A. Gray) Greene). 

 Known from the Kaibab Plateau to Coconino Wash, 9 miles south of 

 the Grand Canyon (Coconino County), and Hopi Indian Reservation 

 (Navajo |County), 7,000 to 9,000 feet, in open yellow-pine] forest, 

 sometimes with sagebrush, August and September. 



C. parryi subsp. attenuatus (M. E. Jones) Hall and Clements also 

 is recorded from Arizona, on the basis of Jones 6052k from the "Buck- 

 skin Mountains," Kaibab Plateau (see footnote 63, p. 908, Hall and 

 Clements, p. 201) . This specimen, however, is quite indistinguishable 

 from material referred by these authors to subsp. nevadensis. 



8. Chrysothamnus nauseosus (Pall.) Britton in Britt. and Brown, 



Illus. Fl. 3: 326. 1898. 



Chrysocoma nauseosa Pallas ex Pursh, Fl. Amer. Sept. 517. 

 1814. 



In one or another of its forms, this variable species ranges from 

 Saskatchewan to British Columbia, south to western Texas, northern 



