120 COMPOSITZA. 
A slender and weak form, with smaller heads, fewer rays, and nearly entire cauline 
leaves (radical ones spatulate and serrate), is from Desierto Viejo (Bourgeau, 840). 
2. Achzetogeron seemannii, A. Gr. in litt. 
Polyactidium seemannii, Schz. Bip. in Seem. Bot. Voy. ‘ Herald,’ p. 301. 
Boltonia seemannii, Benth. et Hook. Gen. Plant. i. p. 269. 
Norra Mexico, Sierra Madre (Seemann, 2026). Hb. Kew. 
3. Achztogeron wislizeni, A. Gr. Pl. Fendl. p. 72. 
Facie Erigerontis pumili, subpedalis, hirsutus ; foliis omnibus linearibus trinerviis, imis inciso- 
dentatis, ceteris integerrimis ; involucri bracteis linearibus dorso villosis ; ligulis (albis) numero- 
sissimis (circa 400) angustissimis ; acheniis parce hirtellis, 4-nerviis; pappo conspicuo, e paleis 
5-6 laciniato-denticulatis, basi concretis. 
NortH Mexico, Sierra Madre, west of Chihuahua ( Wislizenus). 
. 50. BOLTONIA. 
Boltonia, Lhér. Sert. Angl. p. 27; Benth. et Hook. Gen. Plant. ii. p. 269. 
About a dozen herbaceous species, inhabiting North America and Northern and Sub- 
tropical Asia. 
1. Boltonia campestris, Benth. et Hook. Gen. Plant. ii. p. 269. 
Dichetophora campestris, A. Gr. Pl. Fendl. p. 73. 
Texas.—NortH Mexico, Monterey and Chihuahua (Gregg, 49). Hb. Kew. 
51. ASTER. 
Aster, Linn. Gen. Plant. n. 954; Benth. et Hook. Gen. Plant. ii. p. 271. 
Herbaceous plants. About 350 species have been founded ; but Bentham and Hooker 
think there are not many over 200. They are mostly natives of the temperate and 
cold regions of the northern hemisphere, and have by far their greatest concentration 
in North America. A few species occur in the Andes of South America and in South 
Africa. The Mexican species greatly need revision. 
1. Aster asperrimus, Less. in Linnea, v. p. 142. 
Sout Mexico, near Hacienda de la Laguna (Schiede & Deppe). 
2. Aster canescens, Pursh, Fl. Am. Sept. ii. p. 547. 
Macheranthera canescens, A. Gr. Pl. Wright. i. p. 89. 
Western Nort America, from British TerRirory southwards.—Norta Muxico, Ojo 
de Vaca (Torrey). 
3. Aster carnosus, A. Gr. Synop. Fl. N. Am. ined. 
Linosyris ? carnosa, A. Gr. Pl. Wright. i. p. 80. 
Bigelovia carnosa, Benth. et Hook. Gen. Plant. 11. pp. 255, 536. 
Norra Mexico, Chiricahui Mountains, 8. Arizona (Wright). Hb. Kew. 
