Class XIX. Order II. 479 



bristly and chaffy ; corolla floscular ; calyx globu- 

 lar with hooks on the top of the scales. 



223. CNICUS. Receptacle villous ; down feath- 

 ery ; corolla floscular ; calyx swelling, with spinous 

 scales. 



224. ONOPORDON. Receptacle cellular ; down 

 capillary ; corolla floscular ; calyx swelling with 

 spinous scales. 



225. VERNONIA. Receptacle naked ; down 

 double., the outer chaffy, inner capillary ; corolla 

 floscular ; calyx ovate, imbricate. 



. ji *- 



A lAsfa-S . 



C. Florets tubular. 



226. BIDENS. Receptacle chaffy, flat; seeds 

 angular ; down consisting of awns prickly back- 

 ward ; calyx nearly equal, invested with leaves. 



227. MIKANIA. Receptacle naked ; down 

 simple ; calyx four or six leaved, and four or six 

 flowered. 



228. EUPATORIUM. Receptacle naked ; down 

 simple or rough ; calyx imbricate, oblong ; style 

 longer than the corolla, cloven half way down. 



Order II. SUPERFLUA. Florets of the disc 



with stamens and pistils, those of the ray with 2)istils only ; all 

 fertile. 



229. CONYZA. Receptacle naked ; down sim- 

 ple or rough ; calyx imbricate, roundish ; florets of 

 the margin three cleft. 



230. GRAPHALIUM. Receptacle naked ; down 

 feathery or rough ; calyx with scarious. coloured 

 scales ; florets of the margin subulate. 



