CLASS XYIIT. ORDER II. 57 



obtuse: loment many-jointed, joints 1 -seeded, compres- 

 sed, generally hispid. 



CLASS XVIII. SYNGENESIA. 



ORDER I. POLYGAMIA ^^UALIS. 



A. Florets ligulate. 



Tragopogon. Calyx simple, many-leaved : receptacle 

 naked : egret plumose and stiped. 



Leontod'on. Calyx double : receptacle naked : egret 

 stiped. 



Ldduca. Calyx imbricate, cylindric, with the margin 

 mcmbranaceous : receptacle naked: egret simple, stiped : 

 seed smooth. 



Hieracium* Calyx imbricate, ovate ; egret simple, 

 sessile : receptacle naked or sub-pilose (From white 

 becoming yellowish.) 



Sonclins. Calyx imbricate, inflated : egret pilose, ses- 

 sile : receptacle naked. 



Krigia. Calyx simple, many-leaved : egret 5 mem- 

 branous Ieav 7 es with 5 alternating bristles : receptacle 

 naked. 



B . Florets tiibulous ; flowers capitate. 



Cnicus. Calyx imbricate, witli prickly scales : recep^ 

 tacle villose : egret plumose. 



Carthainns. Calyx ovate, imbricate, with scales ova- 

 tish-leafy at apex : egret chaff-hairy or none : receptacle 

 chaff-bristly. 



JUrctium. Calyx globose, with scales hooked at apex : 

 egret chaff-bristly : receptacle chaffy. 



C. Florets tubulous ; Jiowers discoid. 



Bidens. Calyx calyrled, nearly equal ; sometimes the 

 flower is furnished with a few radiate florets . rerepta- 

 cle chaffy, flat : egret 2, 3 or 4 awns with reflexed and 

 erect lateral prickles : seed 4-rornered. 



Eupatorium. Calyx imbricated (rarely simple) ob- 

 long : style long, cloven half way down : egret pilose or 

 rough papillose : receptacle naked. 



ORDER II. POIYGAMIA SUPERFIUA. 

 A. Flowers discoid. 



Gnaphalium. Calyx imbricate, with the marginal 

 scales rounded, scarious, shortish, glossy, coloured ; rd* 



