FLOWERING PLANTS AND FERNS OF ARIZONA 909 



3. Stems glabrous to pubescent, but never tomentose (5). 



5. Involucre 9 to 13 mm. high, the phyllaries in very sharply defined vertical 



ranks, all very acute to cuspidate-acuminate; achenes glabrous to 



rather sparsely pubescent (6). 



6. Plant densely cinereous-puberulent, only 1 to 3 dm. high; leaves narrowly 



spatulate to oblanceolate or nearly linear 3. C. depressus. 



6. Plant glabrous except for the ciliolate leaf margins, taller; leaves linear. 



4. C. PULCHELLTJS. 



5. Involucre 5 to 9 mm, high, the phyllaries in less sharply defined vertical 

 ranks, obtuse to merely acute or the outer ones acuminate; achenes 

 densely pubescent, rarely merely glandular (7) . 



7. Phyllaries obtuse to acute 5. C. viscidiflortts. 



7. Phyllaries, at least the outer ones, with slender acuminate and often 



cuspidate greenish tips 6. C. greenei. 



1. Chrysothamnus paniculatus (A. Gray) H. M. Hall, Calif. Univ. 



Pub. Bot. 3: 58. 1917. 



Bigelovia paniculata A. Gray, Amer. Acad. Arts and Sci. Proc. 



8: 644. 1873. 

 Ericameria paniculata Kydb., Fl. Rocky Mount. 853. 1917. 



Kingman (Mohave County), Rye Creek, Gila County (Harrison 

 and Kearney 8367), September to November. Utah, Arizona, 

 southeastern California, and Sonora. 



This species is reported to contain 2.5 percent or more of rubber. 



2. Chrysothamnus teretifolius (Dur. and Hilgard) H. M. Hall, Calif. 



Univ. Pub. Bot. 3: 57. 1907. 



Linosyris teretifolia Dur. and Hilgard, Acad. Nat. Sci. Phila. 



Jour. ser. 2, 3: 41. 1855. 

 Ericameria teretifolia Jepson, Man. Fl. PL Calif. 1024. 1925. 



Union Pass, Mohave County, 3,600 feet (Palmer in 1870), Sep- 

 tember and October. Nevada, northwestern Arizona, and southern 

 California. 



3. Chrysothamnus depressus Nutt., Acad. Nat. Sci. Phila. Jour. 



ser. 2, 1: 171. 1848. 

 Navajo and Coconino Counties to Hualpai Mountain (Mohave 

 County), 5,000 to 7,000 feet, dry rocky slopes, May to October. 

 Colorado to Nevada, New Mexico, Arizona, and southeastern Cali- 

 fornia. 



4. Chrysothamnus pulchellus (A. Gray) Greene, Erythea 3: 107. 



1895. 



Linosyris pulchella A. Gray, PI. Wright. 1: 96. 1852. 



Represented in Arizona by var. baileyi (Woot. and Standi.) Blake 

 (C. baileyi Woot. and Standi.). Hopi Indian Reservation, Navajo 

 County (Whiting 2784), 17 miles northeast of Tuba, Coconino County 

 (Kearney and Peebles 12894), about 5,500 feet, sandy soil, September. 

 Kansas to Texas, New Mexico, and northeastern Arizona. 



5. Chrysothamnus viscidiflorus (Hook.) Nutt., Amer. Phil. Soc. 



Trans, ser. 2,7:324. 1840. 



Crinitaria viscidiflora Hook., Fl. Bor. Amer. 2: 24. 1834. 



Including its varieties, the species ranges from North Dakota to 

 British Columbia, south to Now Mexico, Arizona, and eastern Cali- 

 fornia. The typical form, usually 5 dm. high or more, glabrous and 

 with linear leaves 2 to 5 cm. long and 2 to 5 mm. wide, rare in Arizona. 



