20. Aster tephrodes (A. Gray) Blake in Tidestrom, Contrib. U. S- 



Natl. Herbarium 25: 563. 1925. 



Dieteria aster oides Torr. in Emory, Mil. Keconn. 141. 1848. 



Not Aster aster oides MacMillan, 1892. 

 Aster canescens var. tephrodes A. Gray, Syn. Fl. 1 2 : 206. 1884. 

 Machaeranthera aster oides Greene, Pittonia 3: 63. 1896. 

 Machaeranthera tephrodes Greene, Pittonia 4: 24. 1899. 



Near Kingman (Mohave County) and southern Yavapai County, 

 south to Graham, Cochise, Pima, and Yuma Counties, 140 to 5,500 

 feet, mostly in alluvial soil, March to October. New Mexico to 

 Nevada and southern California. 



21. Aster bigelovii A. Gray, U. S. Rpt. Expl. Miss. Pacif. 4: 97. 1857. 



Machaeranthera bigelovii Greene, Pittonia 3: 63. 1896. 



Northern Mohave County and Graham, Gila, Pinal, and Pima 

 Counties, 3,000 to 6,000 feet, canyons and slopes, March to October. 

 Colorado, New Mexico, and Arizona. 



This and the similar A. tephrodes are very showy and handsome. 

 The plants are browsed freely. 



22. Aster adenolepis Blake, Wash. Acad. Sci. Jour. 30: 471. 1940. 



Machaeranthera mucronata Greene, Pittonia 4: 72. 1899. Not 

 Aster mucronatus Sheldon, 1903. 



Kaibab Plateau and north rim of the Grand Canyon (Coconino 

 County), 8,000 to 8,500 feet, perhaps also on the south rim, 7,000 

 feet, August and September, type from Thompson Canyon {Jones 

 6056bl). Known only from northern Arizona. 



23. Aster aquifolius (Greene) Blake, Wash. Acad. Sci. Jour. 30: 471. 



1940. 



Machaeranthera aquifolia Greene ex Woot. and Standi., Contrib. 

 U. S. Natl. Herbarium 16: 188. 1913. 



White Mountains (northern Greenlee County), Cameron to the 

 Grand Canyon (Coconino County), near Ash Fork (Yavapai County), 

 Hualpai Mountain (Mohave County), Mazatzal Mountains (Gila 

 County), 3,200 to 9,500 feet, May to October. New Mexico and 

 Arizona. 



24. Aster cichoriaceus (Greene) Blake in Tidestrom, Contrib. U. S. 



Natl. Herbarium 25: 563. 1925. 



Machaeranthera rigida Greene, Pittonia 4: 25. 1899. Not 



Aster rigidus L., 1753. 

 Machaeranthera cichoriacea Greene, Leaflets 1: 148. 1905. 

 ? Machaeranthera hansonii A. Nels., Wyo. Univ. Pub. Bot. 1: 

 134. 1926. 

 Apache, Navajo, and eastern Coconino Counties, 5,500 to 7,500 feet, 

 dry slopes and mesas, June to October, type of M. rigida from Keam 

 Canyon, Navajo County (Zuck), type of M. hansonii from "Mount 

 Ellen" (Elden Mountain?), near Flagstaff, 7,500 feet (Hanson 814). 

 Colorado, New Mexico, Utah, and Arizona. 



