920 MISC. PUBLICATION 4 2 3, U. S. DEPT. OF AGRICULTURE 



in pine woods, April to August. Wyoming to Nevada, south to Texas 

 and Arizona. 



This and the next are perhaps only forms of one species. 



9. Aster arenosus (Heller) Blake, Wash. Acad. Sci. Jour. 30: 471. 



1940. 



Aster ericaefolius var. tenuis A. Gray, Syn. Fl. 1 2 : 198. 1884- 



Leucelene ericoides var. serotina Greene, Pittonia 3: 149. 1896- 



Leucelene arenosa Heller, Cat. North Amer. PL ed. 1, 8. 1898- 



Leucelene serotina Rydb., Torrey Bot. Club Bui. 33: 153. 1906- 



Apache, Navajo, Coconino, Cochise, Santa Cruz, and Pima Coun- 

 ties, 4,000 to 6,500 feet, dry mesas and slopes, often on limestone, 

 April to October. Colorado to Texas, Arizona, and Mexico. 



10. Aster riparius H. B. K., Nov. Gen. et Sp. 4: 92. 1820. 



Aster sonorae A. Gray, PI. Wright. 2: 76. 1853. 



West of the Chiricahua Mountains (Wright 1163, the type of A. 

 sonorae). Southeastern Arizona and Mexico. 



11. Aster intricatus (A. Gray) Blake, Wash. Acad. Sci. Jour. 27: 378. 



1937. 



Linosyris (?) carnosa A. Gray, PI. Wright. 2: 80. 1853. 

 Aster carnosus A. Gray in HemsL, Biol. Cent. Amer. Bot. 



2: 120. 1881. Not A carnosus Gilib., 1781. 

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



17: 208. 1882. 

 Leucosyris carnosa Greene, Fl. Francisc. 384. 1897. 



Maricopa and Pinal Counties (probably elsewhere), 1,000 to 1,300 

 feet, moist saline soil, May to October. Nevada to south-central 

 Arizona and southeastern California. 



12. Aster spinosus Benth., PL Hartw. 20. 1839. 



Leucosyris spinosa Greene, Pittonia 3: 244. 1897. 



Maricopa, Pinal, and Yuma Counties (probably elsewhere), 250 to 

 1,300 feet, moist saline soil, May to October. Texas to Utah, Nevada, 

 southern Arizona, and California, south to Costa Rica. 



13. Aster abatus Blake in Tidestrom, Contrib. U. S. Natl. Herbarium 



25: 562. 1925. 



Aplopappus tortifolius Torr. and Gray, Boston Soc. Nat. Hist. 



Proc. 1: 212. 1845. 

 Aster tortifolius A. Gray, Amer. Acad. Arts and Sci. Proc. 



7: 353. 1868. Not A. tortifolius Michx. 1803. 

 Xylorhiza tortifolia Greene, Pittonia 3: 48. 1896. 



Western Coconino, Mohave, and northern Yuma Counties, 2,000 to 

 3,500 feet, dry rocky slopes and mesas, March to May. Utah, Nevada, 

 western Arizona, and southeastern California. 



14. Aster exilis Ell., Bot. S. C. and Ga. 2: 344. 1823? 



Eastern Yavapai, Maricopa, Pinal, Cochise, Santa Cruz, and Pima 

 Counties, 1,000 to 4,000 feet, moist soil along streams and ditches, 

 September and October. South Carolina to Florida, west to Cali- 

 fornia, south to tropical America. 



