COMPOSITE. 123 
20. Aster scaberrimus, Less. in Linnza, v. p. 143. 
SoutH Mexico, woods near Jalapa (Schiede & Deppe). 
21. Aster simplex, Willd. Enum. ii. p. 287; DC. Prodr. v. p. 239; Torr. & 
Gray, Fl. N. Am. ii. p. 131. 
CanabDA southward.—Norra Mexico, banks of the Babocomori, Sonora (Wright). 
22. Aster ? spinosus, Benth. Pl. Hartw. p. 20. 
Norta Mexico, Sonora (Wright), below Saltillo (Gregg), region of San Luis Potosi, 
6000 to 8000 feet (Parry & Palmer, 381); Soura Mexico, Aguas Calientes (Hartweg). 
Hb. Kew. 
23. Aster tanacetifolius, H. B. K. Nov. Gen. et Sp. iv. p. 95. 
Macheranthera tanacetifolia, Nees, Ast. p. 224. 
Dieteria coronopifolia, Nutt. in Torr. & Gray, Fl. N. Am. p. 101. 
CatirorniaA ; New Mexico; Texas.—Norta Mexico, Salado, Chihuahua (Wright), San 
Antonio de las Alanzanes (Gregg). Hb. Kew. 
24. Aster, sp. . 
Sout Mexico, Orizaba (Botteri, 1153, 1154; Bourgeau, 3341). Hb. Kew. 
25. Aster, sp. 
Souta Mexico, valley of Cordova (Bourgeau, 3341 bis), Orizaba (Botteri, 1155). 
Hb. Kew. 
26. Aster, sp. 
SourH Mexico, Zimapan (Coulter, 298, 300). Hb. Kew. 
52. ERIGERON. 
Erigeron, Linn. Gen. Plant. n. 951; Benth. et Hook. Gen. Plant. ii. p. 279. 
About 100 species of herbs, widely dispersed in temperate regions, rarer in the 
tropics. Two or three annual species are almost ubiquitous weeds of cultivation. 
There are probably not more than ten or twelve distinct species within our limits. 
1. Erigeron affinis, DC. Prodr. v. p. 289. 
Sourn Mexico, around the city of Mexico (Berlandier). 
2. Erigeron bonariensis, Linn. Sp. Pl. p. 1211; Griseb. Fl. Brit. W. Ind. p. 365. 
SourH Mexico, valley of Mexico (Bourgeau, 1080, 1081), Vera Cruz (Linden, 1216) ; 
Nicaracua, Chontales (Tate, 458); Costa Rica, Alajuela (Polakowsky).—West Inpizs 
and southward to Chili and Uruevay. Hb. Kew. 
8. Erigeron canadensis, Linn. Sp. Pl. p. 1211; DC. Prodr. v. p. 289. 
This widely dispersed weed is common throughout Mexico and Central AMERICA. 
Hb. Kew. 
r 2 
