of the Class Composite. 183 



In Sonchus the rays of the pappus are united into bundles at 

 the base, and the receptacle is rough and much dilated. 



Trib. 4. Scorzonere;e. Receptaculum epaleatum. Anther a 

 basi bisetae, appendicula exiguareniformi! coronatae. Stig- 

 mata saepius filiformia, papillosa. Involucrum simplex v. im- 

 bricatum. 



PlCROSIA. 



Involucrum 8-phyllum. Ligulce tridentatae, 4-nerviee ! Pappus 

 capillaris, stipitatus. 



Involucrum simplici serie 8-phyllum, cylindricum, basi omnino 

 nudum : foliolis ligulatis, obtusis, margine invicem se im- 

 bricatis, planis. Receptaculum planum, nudum. Flosculi 

 plurimi : tubus tenuissimus, filiformis ; fauce extus villosi- 

 uscula : liguld lineari, tridentatd, 4-nervia. Stamina fere 

 omnino exserta : filament a capillaria, libera : ant her <b levi- 

 ter coalitae, basi bidenticulatae, crista exigua brevissimd 

 coronatae. Stigmata brevia, semicylindrica, obtusa, papil- 

 loso-pruinosa, arcuato-conniventia. Achenia fusiformia, sul- 

 cis plurimi s longitudinaliter notata, glabra. Pappus longe 

 stipitatus, capillaris, mollis, caducus : radiis duplici ordine 

 confertis, scabriusculis, inaequalibus, basi solutis. 



Herba perennis, laevigata, glauca. Caulis erect us, pedalis, ramo- 

 sus, teres, stria tus, calamum scriptorium crassitie fere ad- 

 aquans. Rami paucissimi. Folia sessilia, lanceolata, inte- 

 gerrima, nunc remotissime dentata, palmaria v. spithamaa, 

 pollicem lata ; inferiora basin versus angustata, sublingulata ; 

 superiora amplexicaulia, basi sagittata. Flores solitarii, pe- 

 dunculati. Involucrum unciale, Icevissimum : foliolis apice 

 puberulis. Flosculi lutei ? tenues, involucro longiores. Pap- 

 pus semipolUcem longus, cinereo-fulvus. Nomen a rriKpos, 

 amarus. 



vol. xvi. 2 B 1. V.hn- 



