62 PROCEEDINGS OF THE AMERICAN ACADEMY. 
tifolia, Torr. he made a new genus Pectidopsis.! Pectidium, Lessing, 
was kept up, as was also his Pectis and Lorentea. Pectis 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 nullus aut dimidiatus auric- 
uleformis brevis”; and he described five new species, L. Henkeana, 
and L. auricularis (probably only a form of Pectis canescens, HBK. 
from Mexico, and three from South America. 
Hooker and Arnott,? in 1841, described two Mexican species, P. Jalis- 
cana (printed Taliscana), *‘ pappo radii et disci setis 3-6 aristatis basi 
dilatatis paleisque paucis brevissimis”; and P. diffusa, ‘* pappi paleis 
setiformibus scabris inzequalibus 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 Peetidopsis as a genus. 
In 1844 Bentham published two Mexican species, P. multiseta 4 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 1846 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 undistinguishable 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- 
pectis and Pectothriz. In the subgenus Heteropectis, ‘‘ Pappus coroni- 
formis et 1—4-aristatus, vel saltem fl. disci muticus; aristis serrulato- 
scabris,” were placed P. multiseta, Benth., and P. untaristata, DC.; an 
P. fastigiata, P. filipes, and P. Coulteri were described as new. In - 
subgenus Pectothriz, ‘* Pappus e setis aristisve gracilibus basi vix dila- 
tatis 6-20 (raro paucioribus) serrulato scabris vel barbellatis conssan 
conformis, aut fl. radii brevis auriculeformis,” he placed P, diffust, 
eo ceaeeeeenner 
1 DC. Prodr. 1. ¢. 98. 5 Benth. l. ec. 110. 
2 Bot. Beech. 296. 6 Hook. Lond. Jour. Bot. v. 239-241. 
8 FI, ii. 62. 7 Trans. Linn. Soc. xx. me 
4 Benth. Bot. Sulph. 20. 8 PL Fendl. 61, 62. 
