DICOTYLEDONS. COMPOSITE. Centaurea. 231) 



tomentose, their scales lanceolate spreading, p. 236. Way- 

 sides. 



2. Cn. palustris, leaves decurrent scabrous pinnatifid spinous, 

 involucres ovate clustered, their scales ovato-lanceolate mucro- 

 nate appressed. p. 236. Meadows. 



*"* Leaves sessile. 



3. Cn. arvensis t leaves sessile pinnatifid spinous, stem panicled, 

 involucre ovate, scales appressed mucronated. p. 237. Fields. 



4. Cn. eriophorus, leaves sessile pinnatifid every other segment 

 pointing upwards spinous scabrous, involucres sphaerical woolly. 

 p. 237. Road- sides* 



5. Cn. heterophyllus, leaves amplexicaul lanceolate ciliato-den- 

 tate undivided or laciniated white and downy beneath, flowers 

 mostly solitary, p. 237. Marshy places in the mountains. 



6. Cn. pratensis, leaves sessile lanceolate waved at the edge and 

 unequally spinous pubescent cottony beneath, flowers mostly 

 solitary, "p. 237- Pastures. 



7. Cn. acaulis, stemless, involucre glabrous, p. 237. Dry pas- 

 tures. 



17. ONOPORDUM. 



Involucre swelling, its scales spreading and spinous. Receptacle 



cellular. Pappus deciduous, rough. 

 1. O. Acanthium> scales of the involucre spreading subulate, 



leaves ovato-oblong sinuated and spinous decurrent woolly on 



both sides, p. 238. Waste places. 

 18. CARLINA. 



Involucre swelling, the ext. scales with numerous spines ; the inner 

 ones coloured, scariose. Receptacle chaffy. Pappus feathery. 



l.C. vulgarity stem many-flowered corymbose pubescent, leaves 

 lanceolate unequally spinous and sinuated downy beneath. 

 p. 238. Dry hills. 



19. CENTAUREA. 



Involucre scaly. Receptacle bristly. Corollas of the ray sterile, 

 infundibuliform, irregular, longer than those of the disk. Pap- 

 pus simple. 



1. C. Jacea, scales of the involucre scariose torn, the lower ones 

 pinnatifid, leaves linear lanceolate, the lower ones broader and 

 toothed, p. 248. Woods and pastures, rare. 



2. C. nigra, scales of the involucre ovate ciliated with capillary 

 teeth, lower leaves angulato-lyrate, upper ones ovate, p. 248. 

 Pastures. 



3. C. Cyanus, scales of the involucre serrated, leaves linear entire 

 the lowermost toothed, p. 249. Cornfields. 



4. C. Scaliosa, scales of the involucre ciliated ovate pubescent, 



