FLOUA OF SOUTH AMERICA AND THE PACIFIC. 43 



pLucHEA. Cass. 



1109. (1.) P. macrocephala {De Cand. Prodr. v. p. 450); 

 herbacea erecta simplex pilosa, caule striate, foliis longe de- 

 currentibus alatis infer, ovali-oblonais serratis basi longe 

 attenuatis, super, lanceolatislinearibusveintegerrimis, capitu- 

 lis 7 — 8 in corymbum terminalem dispositis, pedicellis paten- 

 tim hirsutis, involucris tonientoso-lanatis hirsutissimisque. — 

 Conyza Megapotamica. Spr. — a. caule angusto elato. Rocks 

 Via Monte and Rio Grande. Tweedie, — /3. caule lato-alata. 

 Boggy ground near Maldonado. Tweedie. — Caulis mono- 

 poly cephalus. 



1110. (2.) P. Quitoc {DC. Prodr. v. ;>. 450); herbacea, 

 foliis sessilibus longe in alas foliaceas decurrentibus oblongis 

 lanceolatisve calloso-denticulatis, corymbo composite sub- 

 fastigiato, invol. squamis lanceolatis subacutis — Rio Grande, 

 Mato-Grosso, ubi dicitur "Quitoc." Lund, {De Cand.) 

 Tweedie. N. Patagonia. Tweedie. 



nil. (3.) P. ohlongifolia (De Cand. Prodr. v. ;tJ. 451); 

 herbacea subfusco-pubescens subglutinosa, foliis basi longe 

 decurrenti-alatis vel junioribus obtuse truncatis sessilibus 

 serratis venoso-reticulatis, corymbo terniinali subcomposito, 

 invol. squamis dorso puberis giandulosis lanceolatis acumina- 



tis disco longioribus Victoria, S. Brazil. Tweedie. — Our 



plant seems shrubby ; in the young branches the leaves are 

 sessile and obtuse at the base, in the older ones singularly 

 decurrent. 



1112. (1.) Pterocaulon spicatum {DC. Prodr. v. p. 454). 

 Conyza spicata, Lam. C. rugosa, Vahl. Chlcenolobus, Cass» 

 — Buenos Ayres, Rio Grande and Maldonado. Tweedie. 



1113. (2.) Pt. angustifoUum {DC. Prodr. v. p. 454).— 



— Buenos Aj'res. Ttveedie Here the glomerules of capitula 



form a dense globose head, which seems the only difference 

 between it and Pt. spicatum. 



1114. (1.) Tessaria absinthoides {DC. Prodr. \. p. 457); 

 ramis foliisque adprcssissinie canis subargeuteis, foliis lance- 

 olatis utiinque acuminatis, nunc integerrimis, nunc dentibus 



