FLOWERING PLANTS AND FERNS OF ARIZONA 245 



58. Inflorescence more or less lanate, relatively open, not broom- 

 like, with the few branches ascending at a wide angle; 

 leaf blades seldom more than 2 cm. long, less strongly 

 revolute, the white-lanate lower surface nearly always 

 evident, the upper surface rarely completely glabrous; 

 involucres loosely lanate or glabrate, turbinate or tur- 

 binate-campanulate; perianth 2 to 2.5 mm. long, the outer 

 lobes obovate to nearly orbicular (59). 

 59. Stems erect or ascending, few-branched from the base, the 

 branches of the inflorescence 2.5 to 4 cm. long; leaf 

 blades 10 to 20 (rarely 30) mm. long, sparsely floccose 

 or glabrate and green above; perianth white or occasion- 

 ally pale pink; involucres, especially those in the fork.s, 



often pedunculate 54. E. simpsoni. 



59. Stems spreading or decumbent, many-branched from the 

 base, the branches of the inflorescence not more than 

 2 cm. long; leaf blades 5 to 10 mm. long; perianth bright 

 pink 55. E. mearnsii. 



1. Eriogonum divaricatum Hook., Jour. Bot. and Kew Gard. Misc. 

 5: 265. 1853. 

 Apache, Navajo, and Coconino Counties, 4,500 to 6,000 feet, June 

 to September. Colorado, Utah, and Arizona. 



*2. Eriogonum puberulum S. Wats., Amer. Acad. Arts and Sci. Proc. 

 14: 295. 1879. 

 Not known definitely to occur in this State, but has been collected in 

 Utah and Nevada very near the Arizona boundary. 



3. Eriogonum nidularium Coville, Contrib. U. S. Natl. Herbarium 4: 



186. 1893. 



Eriogonum vimineum Dougl. subsp. nidularium Stokes, Gen. 

 Eriog. 49. 1936. 



Mohave County, 3,500 feet or lower, May. Idaho to Arizona and 

 southern California. 



4. Eriogonum densum Greene, Pittonia 3: 17. 1896. 



Eriogonum vimineum Dougl. var. densum Stokes, Gen. Eriog. 

 49. 1936. 



Coconino and Mohave Counties to Pima County, 3,000 to 6,300 feet, 

 common, May to October. Utah and Nevada to New Mexico and 

 Arizona. 



Very common at roadsides in the foothills and mountains. Closely 

 related to E. nidularium Coville. 



5. Eriogonum vimineum Dougl. ex. Benth., Linn. Soc. London 



Trans. 17:416. 1837. 



Coconino and Mohave Counties to Gila and Maricopa Counties, 

 3,000 to 7,000 feet, May to October. Idaho and Washington to 

 Arizona and California. 



Broom eriogonum. Represented in Arizona by subsp. juncinellum 

 (Gandoger) Stokes. The type of E. juncinellum Gandoger was col- 

 lected at the Grand Canyon (MacDougal 182). 



