170 SYNGENESIS. 



229. PICRIS. Receptacle naked ; down feathery ; seeds furrowed 



transversely ; calyx double, innermost equal, outer lax. 



228. TRAGOPOGON. Receptacle naked ; down stalked, feathery ; 

 calyx simple, of several equal scales, in 2 rows, 



232. LEONTODON. Receptacle naked ; down stalked, simple ; 

 mlyx imbricated, double, scales of the outermost lax. 



231, LACTUCA. Receptacle naked; down stalked, simple; calyx 

 imbricated, simple, cylindrical, scales membranous at the 

 margin. 



230. SONCHUS. Receptacle naked ; down sessile, simple ; calyx 



simple, imbricated, swelling at the base. 



237. LAPSANA. Receptacle naked ; down none ; calyx double, in- 

 nermost of equal channelled scales. 



* * Florets all tubular, lax, and spreading in the limb. Capitate* 



243. CARLINA. Calyx swelling, outer scales spinous, inner co- 



loured, polished, radiant ; receptacle chaffy ; down feathery- 



239. ARCTIUM. Calyx globose, scales spinous, hooked, in- 



flexed. 



240. CARDUUS. Calyx tumid, imbricated, scales spinous; recep- 



tacle hairy ; down deciduous, capillary, roughish. 



241. CNICUS. Calyx tumid, imbricated, scales spinous; recep- 



tacle hairy ; down deciduous, feathery. 



242. ONOPORDUM. Calyx tumid, scales spinous, spreading ; re- 



ceptacle cellular, somewhat chaffy. 



* * Florets all tubular, parallel, crowded, nearly on a level at the 



top. Discoid. 



244, EVPATORIUM. Receptacle naked ; down rough ; calyx im- 



bricated, oblong ; style cloven half. way down, prominent. 



