FLOWERING PLANTS AND FERNS OF ARIZONA 929 



20. Erigeron flagellaris A. Gray, Amer. Acad. Arts and Sci. Mem. 



ser. 2, 4: 68. 1849. 



Erigeron macdougalii Heller, Torrey Bot. Club Bui. 26: 591. 

 1899. 



Erigeron tonsus Woot. and Standi., Contrib. U. S. Natl. Her- 

 barium 16: 186. 1913. 



Northern Apache, Navajo, and Coconino Counties to the mountains 

 of Cochise and Pima Counties, 5,000 to 9,500 feet, open coniferous 

 forests and mountain parks, May to September, type of E. macdougalii 

 from San Francisco Peaks (MoxDougal 390). South Dakota and 

 Wyoming to Texas, New Mexico, and southern Arizona. 



Occasional specimens (such as Wilcox 44, Peebles et al. 2642, Cham- 

 berlain 45) are suggestive of hybridism between this species and E. 

 nudiHorus, combining the habit of one of these species with the pubes- 

 cence of the other. 



21. Erigeron nudiflorus Buckl., Acad. Nat. Sci. Phila. Proc. 1861: 



456. 1862. 



Erigeron commixtus Greene, Pittonia 5: 58. 1902. 



Apache County to Mohave County, south to Santa Cruz and Pima 

 Counties, 4,000 to 7,000 feet, rocky slopes, mesas, and canyons, 

 common, March to July. Colorado and Utah to Texas, New Mexico, 

 Arizona, and northern Mexico. 



22. Erigeron bellidiastrum Nutt, Amer. Phil. Soc. Trans, ser. 2, 



7: 307. 1840. 



Erigeron eastwoodiae Woot. and Standi., Contrib. U. S. Natl. 

 Herbarium 16: 183. 1913. 



Known for Arizona only by a collection in the Carrizo Mountains, 

 Apache County (Standley 7433, the type of E. eastwoodiae). South 

 Dakota to Nevada, Texas, and northeastern Arizona. 



23. Erigeron divergens Torr. and Gray, Fl. North Amer. 2: 175. 



1841. 



? Erigeron accedens Greene, Pittonia 4: 155. 1900. 

 Erigeron wootoni Rydb., Torrey Bot, Club Bui. 33: 153. 1906. 

 Erigeron gracillimus Greene, Leaflets 2: 212. 1912. 

 Erigeron jurcatus Greene, Leaflets 2: 213. 1912. 



Throughout the State, 1,000 to 9,000 feet, dry rocky slopes and 

 mesas and open pine woods, very common, February to October, type 

 of E. accedens (not examined) from Clifton, Greenlee County {Davidson 

 in 1899), type of E. gracillimus from Coconino National Forest 

 (Jardine and Hill in 1911), type of E. jurcatus from Kendrick Peak. 

 Coconino County (Knowlton 45). South Dakota to British Columbia, 

 south to Texas, New Mexico, Arizona, California, and northern 

 Mexico. 



24. Erigeron lobatus A. Nels., Amer. Jour. Bot. 21: 580. 1934. 

 Mohave, southern Gila, Maricopa, Pinal, Pima, and Yuma Counties, 



1,500 to 3,000 feet, plains, mesas, and rocky slopos, March to May. 



