322 COMPOSIT.E. Vernonia. 



CONSPECTUS OF THE TRIBES. 



Suborder I. TUBIFLORjE. Corolla of the perfect flowers tubular, and regularly 5- (rarely 2 - 4-) toothed. 



Tribe I. Vernoniace^. Style of the perfect flowers cylindraceous ; the branches usually elongated and subulate, 



hispid throughout ; the stigmatic lines not extending beyond their middle. 

 Tribe II. EnPATOHiACE.E. Style of the perfect flowers cylindraceous ; the branches elongated, obtuse or clavate-, 



externally puberulent or papillose towards the summit ; the stigmatic lines obscure, terminating near their 



middle. 

 Tribe III. Asteroide j:. Style of the perfect flowers cylindraceous ; the branches linear, externally flattish, minutely 



and equally pubescent above ; the stigmatic lines prominent, extending to about the origin of the exterior 



pubescence. 

 Tribe IV. SENECiONiDEa:. Style of the perfect flowers cylindraceous; the branches linear, truncate at the summit and 



pencillate, or often produced into a conical or elongated hispid appendage ; the stigmatic lines rather 



broad and prominent, extending to the commencement of the appendage or hairy portion. 

 Tribe V. Ctnaee^. Style of the perfect flowers thickened and nodose towards the summit, and often pencilled at the 



node ; the branches either concrete or distinct, puberulent on the outside : ihe stigmatic lines reacliing to 



and confluent at the summit of the branches. 



Suborder II. LIGULIFLOR^. Flowers all perfect or ligulate. 



Tribe VI, Cichobace^:. Style cylindraceous above; the branches rather long and obtuse, equally pubescent; the 

 stigmatic lines terminating below their middle. — Plants with milky juice. 



Suborder I. TUBIFLORtE. DC. 



Corolla of the perfect flowers tubular, and regularly 5- (rarely 4-) toothed or 

 lobed. Pollen globose, echinate, or (m Cynareje) rarely smooth and elliptical. 



Tribe I. VERNONIACEjE. Less. 



Heads discoid, with tlie flowers all tubular mid perfect (homogamous), or rarely radiate ; 

 the ray-flowers ligulate and pistillate. Corolla occasionally palmate, or obscurely 

 2-lipped. Style cylindrical above ; the branches subulate and elongated {rarely short 

 and obtuse), equally hispid ; the stigmatic lines terminating below or near the middle, 

 not confluent. 



1. VERNONIA. Schreb. gen. p. 541 ; Endl. gen. 2204. IRON-WEED. 



[ Named after Mr. William Vernon, an English botanist, who many years ago travelled and collected plants in tliis 



country.] 



Heads several- or many-flowered, homogamous ; the flowers all equal and tubular. Involucre 

 imbricate. Receptacle commonly naked. Corolla regular. Filaments smooth. Achenia 

 mostly striate or ribbed, with a cartilaginous callus at tlie base. Pappus usually double ; 

 the inner of numerous bristles ; the outer mostly short or minute, often somewhat chaffy, — 

 Mostly perennial herbs, with usually alternate leaves ; in tlie North American species, 

 corymbose-cymose. Flowers purple, rose-color or white. 



