268 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Parthenium L. 
P. Hysterophorum L., Sp. pi., vol. 2, p. 988 (1753); Griseb., Fl. 
Brit. W. Ind., p. 369. — Santa Ana, Ernst; El Valle, Miller <{• Johnston, 
no. 233. Venezuela: near Caracas and on the banks of the Orinoco, 
HBK., Nov. gen. et sp., vol. 4, p. 259. Widely distributed in temperate 
and tropical America. 
Pluchea Cass. 
P. ODORATA (L.) Cass., Diet. sci. nat., vol. 42, p. 3 (1826); Griseb., 
Fl. Brit. W. Ind., p. 366. Conyza odorata L., Syst. nat., ed. 10, vol. 2, 
p. 1213 (1760).— Santa Ana, Ernst; El Valle, Miller & Johnston, 
no. 1, July 21, and Johnston, no. 318. Distribution general in tropical 
America. 
PoROPHYLLUM Adans. 
P. ruderale (Jacq.) Cass., Diet. sci. nat., vol. 43, p. 56 (1826); 
Griseb., Fl. Brit. W. Ind., p. 379. Kleinia ruderalis Jacq., Enum. 
pi. Carib., p. 28 (1760), as rudealis. — Santa Ana, Ernst; El Valle, 
Miller & Johnston, no. 130, July 24. Distribution general in tropical 
America. 
Senecio L. 
S. soxcHiFOLiA (L.) Moench, Meth. suppl., p. 231 (1802). Cacalia 
sonchifolia L., Sp. pi., vol. 2, p. 835 (1753). Emilia sonchifoUa DC, 
Prod., vol. 6, p. 302 (1837).— El Valle, Miller & Johmton, no. 137, 
July 19. Widely distributed in tropical countries. 
SONCHUS L. 
S. OLERACErs L., Sp. pi., vol. 2, p. 794 (1753); Griseb., Fl. Brit. W. 
Ind., p. 384. — Santa Ana, Ernst. Widely distributed in temperate 
and tropical countries. 
Spilaxthes Jacq. 
S. OCYMIFOLIA (Lam.) A. H. Moore, Proc. Amer. acad. arts and sci., 
vol. 33, p. 531 (1907). Bidens ocymifolia Lam., Encycl., vol. 1, p. 416 
(1783). Spilanthus exasperata Jacq., Ic. pi. rar., vol. 3, p. 15, pi. 584 
(1786-93).— Rio Asuncion, alt. 450 m., Johnston, no. 102, Aug. 12-15. 
Venezuela: Caracas, Birschel; Colonia Tovar, Fendler, no. 691, 
1854-55. Distribution general in tropical America. 
