46 iLOUA OF SOUTH AMKUICA AND THE PACIFIC. 



grossis acutis hinc inde incisis, subtus nervoso-reticulatis, 

 invol. squaniis glabris acutis, disco 7 — 8-floro. DC. — Baccha- 

 ris absinthoides. Hook, et Arn. Bat. of Beech. Voy. p. 57. 

 Gyneteriaincana, Spr — Chili. Conception. Beechey. Cum- 

 ing, (n. 82'2.). Valparaiso. Bridges {ji. 55.) Mendoza. Br 

 Gillies. {^^Paxaro — Bobo," vern. n. 1/3.). Monte Video 

 and Banda Orientale, and sides of Rio Petombolo. Tweedie 

 («. 1209.). — We have adopted, following De Candolle, the 

 Genera Pluchea, Pterocaidon, and. Tessaria; they differ in 

 habit, but are scarcely distinguishable by any characters. 

 The present plant does not belong to Tessaria, as defined by 

 Lessing ; but to his Pliichea. 



Subtrib. IV. Eclipte^e. Less. 



1115. (1,) Siegesbeckia serrata {DC. Prodr.v. /?. 496); 

 foliis ovatis acutis regulariter dentato-serratis breviter petio- 

 latis, summis sessilibus ovato-lanceolatis ciliatis, invol. ext. 

 squamis interiore duplo longioribus, DC. — S. cordifolia, 

 Poepp. Diar. Herb. n. 55. Hook, et Am. mst. (an H.B.K. ?) 

 — Chili. Chamisso. Between Valdivia and Los Uanos, Pro- 

 vince of Valdivia. Bridges {n. 689). Woods of Tucunian. 

 Tweedie (n. 1239^— De Candolle says of this, "Differrevide- 

 tur a S. cordifolia, petio]osemipo]\. nee 3-pollic., limbo ovato 

 nee cordato, inv. ext. squamis brevioribus;" but these differ- 

 ences do not appear to us to be constant. 



1116. (1.) Eclipta erecta {DC. Prodr. v. p. 490.)— Rio 

 St Lucia, and banks of the Uraguay, Banda Orientale, and 

 St Catharine, S. Brazil. Ttveedie {n. 450.) 



Subtrib. V. Melampodie.t:. Less. 



1117. (1.) Polymnia silphioides {DC. Prodr. v. p. iilG); 

 caule tereti puberulo-glanduloso, foliis oppositis alternisve 

 membranaceis puberulis triplinerviis grosse dentatis apice 

 subtrilobis basi in petiolum alatum irregulariter dentatum 

 attenuatis prope basin auriculato-dilatatis, inv. squamis ext. 

 ovatis acutis dorso villosis, achieniis obovatis snbcompressis, 

 Hgulis linearibus integris £>C.— Rio Grande {De Cand.) 



