Composites.} 



MEXICO.— SUPPLEMENT. 



435 



habit of a Chrysopsis it will no doubt be found to belong to some other genus when more perfect specimens 

 can be examined. 



1. Wedel i a strigosa (n. sp.); caule erecto suffruticoso, ramis elongatis striatis pubescenti- 

 hirsutis, foliis brevissime petiolatis ovatis serratis longe angusteque acuminatis trinerviis 

 supra undique subtus ad nervos strigoso-hispidis setis tuberculo albo impositis, pedunculis 

 terminalibus vel e dichotomiis ramorum folio longioribus monocephalis, involucri squamis 

 ovato-ligulatis exterioribus subfoliaceis hirsutis interioribus subscariosis ciliatis, achenio 

 glabro calyculo fimbriato dentibus 2 longioribus. 



Hab. Acapulco. — This does not accord with W. Acapulcencis of H.B.K., nor with any other described 

 species. 



2. W. cordata (n. sp.); piloso-scabra herbacea, foliis longe petiolatis cordatis (supe- 

 rioribus ovato-cordatis) acuminatis membranaceis serratis trinerviis, pedunculis terminali- 

 bus gracilibus tricephalis diphyllis, involucri squamis lanceolatis acutis pubescenti-hirtis, 

 acheniis ? 



Hab. Realejo. — Apparently a tall growing herbaceous plant, scabrous to the touch, and, when the leaves 

 are magnified, the hairs are seen to be short but situated on a small white tubercle as in the preceding 

 species, from which in other respects it is totally different. The achenia are too young to allow us to describe 

 their form accurately. 



3. W. populifolia (n. sp.) ; herbacea elata erecta pubescenti-scabra, foliis lato-cordatis 

 longe petiolatis serratis tenui-acuminatis trinerviis, paniculis foliosis, capitulis ssepe subver- 

 ticillatis, pedunculis pedicellisque pilosis, involucri squamis ovatis acutis striatis versus 

 apicem prtecipue hirsutis, acheniis ? 



Hab. Realejo. — Here, also, the flowers are too young to exhibit the exact structure of the achenium and 

 pappus : but the species is very different from the preceding ones. The capitula are numerous and frequently 

 subverticillate. 



4. W . subflexuosa (n. sp.) ; herbacea, glabra, vel sub lente minute piloso-hispida, ramis 

 elongatis subflexuosis, foliis ovatis acuminatis membranaceis serratis trinerviis basi in 

 petiolum perbrevem attenuatis, paniculis terminalibus et e dichotomiis ramorum poly- 

 cephalis subaphyllis, involucri squamis ovatis acutis striatis pubescenti-hirsutis, acheniis 

 obovatis, pappo calyculato fimbriato dentibus subaequalibus. 



Hab. Realejo. — Readily known from the preceding ones by the different leaves, the long flexuose branches, 

 and the closely imbricated rather small scales of the involucre. 



1. Tithonia angustifolia (n. sp.) ; caule fruticoso incano, foliis plerisque oppositis 

 lineari-oblongis obtusis coriaceis asperis obscure serratis trinerviis brevissime petiolatis 

 subtus reticulatis albo-canescentibus, pedunculo terminali brevissimo monocephalo cylin- 

 draceo, involucri squamis pluriserialibus lato-oblongis striatis obtusis incanis margine 

 albo-ciliatis, acheniis interioribus biaristatis. — T. pachycephala. Hook, et Am. stip?'a, p. 

 299. (non De Cand.) 



