282 Mr. D. Don's Descriptions of new Genera aiid Species 



Chuquiraga. Juss. 



JOHANNIA. Willd. 

 Bacasi^ sp., Ruiz et Povon. 



Flosculi regulares, 5-partiti, hermaphroditi. Pappus uniformis. 



Involucrum turbinato-campanulatum, multiplici ordine poly- 

 phjdlum, imbricatum : squamis adpressis, cartilagineis, ex- 

 terii\s gradatim minoribus, costd valid^ apice in mucronem 

 rigidum subulatum excurrente ; intimis elongatis, acumi- 

 natis, radium constituentibus. Receptaciihim dense villoso- 

 lanatum. Flosculi indefiniti, hermaphroditi, tubulosi, alte 

 5-partiti, villosi : fauce inti^s dens^ barbate ! segmentis line- 

 aribus, strictis, apice penicillatis ! nervis marginaUbus pro- 

 mmuhs. Stamina disco epigyno inserta : filamenta com- 

 planata, libera, basi tubi corollse adhaerentia: anthera in 

 tubum connatae, appendice Hneari-ligulat4 cartilaginea co- 

 ronatae, basi bisetae v. bidentatae. Stigmata lineari-lingu- 

 lata, conniventia, papilloso-pruinosa. Achenia turbinata, 

 undique villosissima. Pappi radiis copiosis, vald^ plu- 

 mosis, inferne crassioribus, simplici ordine digestis, ima 

 " basi connatis, apice simplici. 



Frutices sempervirentes, erecti, rigidi, ramosissimi, inermes v. spi- 

 nosi. Folia alterna, margine integerrima, callosa, pungenti- 

 mticronata, coriacea, nitida ; aut omnind stibulata, spinosa. 

 Capitula terminalia, solitaria, sessilia, erecta, magna, v.plura 

 paniculata. Involucra extiis fulvescenti-villosissima, nunc 

 glabriuscula : squamis luteo-coloratis. Flosculi aurei. 



Obs. — Folia sapore amarissimo gaudent. 



* Capitulis 



