FLOWERING PLANTS AND FERNS OF ARIZONA 921 



15. Aster frondosus (Nutt.) Torr. and Gray, Fl. North Amer. 2: 165. 



1841. 



Tripolium frondosum Nutt., Amer. Phil. Soc. Trans, ser. 2, 

 7: 296. 1840. 



Near Betatakin and Shato, northern Navajo County (Wetheritt 

 490, Eastwood and Howell 6588), Tuba, eastern Coconino County. 

 5.000 to 7,000 feet, in a marsh (Kearney and Peebles 12865), September. 

 Wyoming to Oregon, south to northern Arizona and California. 



16. Aster parvulus Blake in Tidestrom, Contrib. U. S. Natl. Her- 



barium 25: 563. 1925. 



Machaeranthera parviflora A. Gray, PL Wright. 1: 90. 1852. 

 Aster parviflorus A. Gray, Bot/ Calif. 1:322. 1876. Not 

 A. parviflorus Nees, 1818. 



Eastern Coconino County (reported as common around Tuba) 

 and Maricopa, Cochise, and Pima Counties, 1,000 to 5,000 feet, 

 mesas and plains, February to September. Utah, New Mexico, and 

 Arizona. 



Machaeranthera pygmaea (A. Gray) Woot. and Standi, does not 

 seem specifically distinct from A. parvulus. 



17. Aster tagetinus (Greene) Blake in Tidestrom, Contrib. U. S. 



Natl. Herbarium 25: 563. 1925. 



Machaeranthera tagetina Greene, Pittonia 4: 71. 1899. 



Northern Mohave County to Cochise and Pima Counties, 1,800 

 to 4,200 feet, mesas and roadsides, common. April to October, type 

 from Arizona without definite locality (Wilcox in 1891). Utah, New- 

 Mexico, and Arizona. 



18. Aster tanacetifolius H. B. K., Nov. Gen. et Sp. 4: 95. 1820. 



Machaeranthera tanacetifolia Nees, Gen. et Sp. Aster. 225. 



1832. 

 Machaeranthera parthenium Greene, Pittonia 4: 99. 1S99. 



Northern Navajo County to Yavapai, Cochise, Santa Cruz, and 

 Pima Counties, 1,200 to 6.000 (rarely 8,000) feet, roadsides and 

 waste ground, June to October, type of M. parthenlum from Davidson 

 Canyon, Empire Mountains, eastern Pima County (Pringle in 1884). 

 South Dakota to Alberta, south to Texas, Arizona, and Mexico. 



19. Aster canescens Pursh, Fl. Amer. Sept. 547. 1814. 



Machaeranthera canescens A. Gray, PI. Wright. 1: 89. 1852. 

 Machaeranthera oxylepis Greene, Pittonia 4: 25. 1899. 

 Machaeranthera verna A. Nels., Bot. Gaz. 37: 267. 1904. 

 Machaeranthera scoparia Greene, Leaflets 2: 227. 1912. 



Northeastern Apache and northern Coconino Counties to Pima 

 and Yuma Counties, 140 to 8,000 feet, dry soil in open pine forests. 

 chaparral, and roadsides, common, August to November, type 4 of M. 

 oxylepis from Apache Pass, Cochise County (Lemmon in 1881 . type 

 of M. verna from Big Bend, Virgin River, Mohave County (Goodding 

 757), type of M. scoparia from Turkey Tanks, Coconino County, 

 6,200 feet (Jareline and Hill in 1911). Colorado to British Columbia, 

 south to Arizona and California. 



