236 Mr. D. Don's Descriptions of new Genera and Species 



scales, and in the structure of its pappus. M. DeCandolle's 

 description and figure of this plant above referred to, are very 

 faithful; but both he and Professor Lagasca, in adopting the 

 name of Willdenow, who had referred it to Perdicium, were 

 evidently ignorant of its being the Chcetanthera serrata of Ruiz 

 and Pavon. 



BlCHENIA. 



Involucrum imbricatum. Flosculi radii labio exteriore multi- 

 nervio ! Pappi radiis triplici ordine dispositis, apice peni- 

 cillatis. 



lnvolucram polyphyllum, inordinate imbricatum : sguamis lan- 

 ceolatis, acuminatis, adpressis ; intimis elongatis, radium 

 aequantibus. Rcceptaculum planum, nudum. Flosculi radii 

 plurimi (15—18), ligulati, bilabiati, foeminei, staminibus 

 sterilibus ; labio exteriore amplo, cuneiformi, obtuse tri- 

 dentato, coriaceo, glabro, multi-(10 v. l5)nervio; interiore 

 exiguo, membranaceo, bipartite : segment is lineari-filamen- 

 tosis, spiraliter revolutis ; disci hermaphroditi, tubulato- 

 bilabiati : labiis longitudine aequalibus ; exteriore ligulato, 

 obtuse trilobo ; interiore bipartito : segmentis linearibus, ob- 

 tusis, erectis. Filamenta linearia, complanata, nervo medio 

 manifesto subcarinata. Anthers appendicula ligulata, mu- 

 cronulata, coriacea terminate, basi bisetse : setis ramulosis, 

 phimosis, extremitate simplici, elongata. Stigma clavatum, 

 bilobum : lobis brevissimis, crassis, conniventi-applicatis, 

 pruinosis. Achenia angusla, compresso-tetragona, undique 

 copiose papillosa. Pappus pilosus, subpersistens : radiis 

 ina;qualibus, triplici ordine digestis, apice penicillatis, le- 

 viter phimosis. 

 Herba perennis, acaulis, ccespitosa, land alba, villosa, molli, sicci- 

 tate lutescente, omnino induta. Folia fere Peclicularium 

 quavundam, numerosa, radicalia, petiolata, interrupts bipin- 



natifda, 



