88 CLASS XVIII. ORDER I. 



pie.) 49. 54 — sfiicaia (gay feather) leaves linear en- 

 tire glabrous ciliate at base dotted, flowers spiked, 

 calyx-scales linear. %.. p — scariosa^ raceme ter« 

 minal, calyx-scales obovate. 1|1. p. — .^gwarro^a, 

 peduncles 1-flowered. 2/. p. 



Vernonia. Calyx imbricate, ovate ; egret dou- 

 ble, exterior chaffy and short, interior capillary ; 

 receptacle naked : stigma 2-cleft, shortish. 49. 55 

 •—novedoracensis (flat-top) corymb fastigiate, stem 

 glabrous, leaves lanceolate. %. p. — firaealtU) sitm. 

 pubescent. 2/ . r. 



Cnicus. Calyx imbricate, with prickly scales : 

 receptacle villose : egret plumose, (Taken from 

 the carduus.) 49. 54 — lanceolatus (thistle) leaves 

 decurrent hispid pinnatifid with 2-lobed spreadin^g 

 divisions, stem hairy, calyx with lance-thorny 

 scales. % , p. — arvensis (Canada thistle) leaves ses- 

 sile glabrous tooth-pinnatifid edged with spines, 

 panicled, scales of calyx minute lanceolate with 

 short soft bristly spines. % . p.--~aliissimus, radical 

 leaves pinnatifid, stem leaves lance-oblong toothed 

 ciliate. 2/ . p. 



Carthamus. Calyx ovate, imbricate with scales, 

 ovatish-leafy at apex : egret chaff-hairy or none : 

 receptacle chaff-bristly. 49. 54 — coeruleus (false- 

 saffron) egret hairy, leaves thorny-toothed. 2/.b. e« 

 tinctorius^ egret none, leaves serrate prickly. 0. ye. 



Onopordon. Calyx imbricate with sharp-mu- 

 cronate scales : egret pilose, caducous : receptacle 

 alveolate : seed transversely sulcate. 49. •54— 

 acanthium (cotton thistle) leaves sinuate downy 

 thorny oblong, decurrent. 



Carduus. Calyx ovate, imbricate with prickly 

 scales : receptacle villose : egret pilose. 49. 54— 

 pectinatus (comb-tooth thistle) leaves decurrent 

 lanceolate pectinate. % . p. — 7wanattW5, leaves clasp- 

 ing, spines channelled doubly-thorned. ©. 



