62 PROCEEDINGS OF THE AMERICAN ACADEMY. 



tifolia, Torr. he made a new genus Pectidopsis} Pectidium, Lessing, 

 was kept up, as was also his Pedis and Lorentea. Pedis fasciculata, 

 Poir., which would seem a very distinct species, was reduced by De Can- 

 dolle to P. prostrata, Cav., and six new species were described, five of 

 them from Mexico. The genus Lorentea De Candolle divided into two 

 sections, Cryptopetalum (for Cryptopetalon, Cass.), '' Pappus radii paleis 

 plurimis acuminato-setiformibus pappo disci brevioribus constans," and 

 Stammarium, Willd. in Herb., "Pappus radii uullus aut dimidiatus auric- 

 ula^formis brevis"; and he described five new species, L. Hoenkeana, 

 and L. auricidaris (probably only a form of Pedis canescens, HBK.) 

 from Mexico, and three from South America. 



Hooker and Arnott,^ in 1841, described two Mexican species, P. Jalis- 

 cana (printed Taliscand)^ "pappo radii et disci setis 3-6 aristatis basi 

 dilatatis paleisque paucis brevissimis"; aud P. diffusa, " pappi paleis 

 setiformibus scabris inasqualibus in disco 10-20, in radio paullo pauciori- 

 bus." And in the same year Torrey and Gray ^ in their Flora followed 

 De Candolle and kept up Pedidopsis as a genus. 



In 1844 Beutham published two Mexican species, P. midtiseta* from 

 Cape San Lucas, and P. arenaria^ in part from Acapulco. Both of 

 these species are well represented by recent collections from the type 

 stations. In 184G Gardner® published six Brazilian Lorenteas, and the 

 next year followed them with another. In 1847 J. D. Hooker'^ de- 

 scribed two species from the Galapagos. 



In 1849 Dr. Gray ^ concluded that, rather than to continue multiply- 

 ing genera undistiuguishable in habit and with " numerous variations and 

 gradations " in pappus, it was necessary " to extend the character of 

 Pectis and restore to it Pectidopsis, Pectidium, and perhaps Lorentea 

 also." In the same work he proposed two additional subgenera, Hetero- 

 pedis and Pedothrix. In the subgenus Heteropedis, "Pappus coroni- 

 formis et 1-4-aristatus, vel saltern fl. disci muticus ; aristis serrulato- 

 scabris," were placed P. mullisda, Benth., and P. uniaristata, DC; and 

 P. fastigiata, P.filipes, and P. Coulteri were described as new. In the 

 subgenus Pedothrix^ " Pappus e setis aristisve gracilibus basi vix dila- 

 tatis 6-20 (raro paucioribus) serrulato scabris vel barbellatis constans, 

 conformis, aut fl. radii brevis auriculseformis," he placed P. diffusa, 



1 DC. Prodr. 1. c. 98. 6 Benth. 1. c. 110. 



2 Bot. Beech. 296. 6 Hook. Lond. Jour. Bot. v. 239-241. 

 8 Fl. ii. 02. 7 Trans. Linn. Soc. xx. 206. 



* Benth. Bot. Sulpli. 20. » pi. pgndl. Gl, 62. 



