CLASS XIX. ORDER I. 303 



354. RuDBECKiA. Receptacle conical, paleaceous; 

 down with a four toothed margin ; calyx with a dou- 

 ble row of scales. 



355. Centaurea. Receptacle bristle; down hairy ; 

 rays funnel-shaped, irregular ; calyx various. 



Orderly. NECESSARIA. Florets of the 

 centre with stamens and pistils, barren ; those of the ray 

 with pistils only^ fertile. 



356. IvA. Receptacle hairy ; seeds naked, obtuse ; 

 down none; calyx three leaved: florets of the ray 

 five. 



SYNGENESIA. 



JEQUALIS. 

 322. CICHORIUM. 

 CicHORiuM iNTYBus L. Succory. 



Flowers in pairs, sessile ; leaves runcinate. 



The large, blue flowers of this elegant plant are extremely 

 common in pastures and road sides every where in the vicinity 

 of Boston. Stem two or three feet high, strong, angular bristly. 

 Leaves roughish, the radical ones runcinate, those of the stem 

 heart shaped, acuminate, and sessile. Flowers mostly in pairs, 

 sessile upon the sides of the stem. Calyx leaves erect, rough 

 on the back, reflexed as they grow old. Florets of the corolla 

 ligulate, ending in about five minute teeth. — From July to Sep- 

 tember. — Perennial. 



323. APARGIA. 

 Apargia autumnalis. Willd. Autumnal Hawkweed. 



Scape branching, peduncles scaly; leaves lanceo- 

 late, tooth-pinnatifid, smoothish. L. 



