M 



212 COMPOSITE. 



. r Bracts all narrow, green : achenes with pappus . . . k 

 ' [Bracts rounded with scarious margin : no pappus . . 1 

 Heads J^ inch, numerous ; involucral bracts narrow, green, 



p. 224. CONYZA, 



Heads Y\ inch bracts several, woolly, or scented herbs 



/. 224. BLUMEA 



Heads ^ inch ; bracts in one row, glabrous .... 



pp. 239, 247. GYNURA or NOTONIA 



TTall herb : heads small p. 238. artemesia 



1 < Low herb of 2 to 4 inches ; leaves much divided . . . 

 ( /. 238. cotula 



Heads 7'ayed. 



{Leaves opposite : receptacle with scales between the florets 

 (Sunflower type) ... n 



Leaves alternate : no scales on the receptacle . . . q 



J Leaves simple o 



" \ Leaves pinnate or bipinnate p 



Tall herb : heads with four or five J^ inch narrow sticky 

 bracts below ......./. 236. siegesbeckia. 



Small herb, not dandular : achenes with feathery scales. . 



" [ A 237. GALINSOGA. 



r Achenes surmounted by two or three barbed spines: rays 



p I yellow /. 236. bidens. 



(Achenes without spines or pappus. /. 235. chrysogonum. 



{Rays yellow : bracts in one row or with a few shorter out- 

 side p. 242. senecio. 

 Rays white, mauve or pink : bracts narrow in several 

 rows r 



J Achenes without pappus, viscid . . p. 221, myriactis. 

 ^ (Achenes with copious pappus . . . p. 222. erigeron. 



Florets all ligulate (Cichoriacecs), 



f Bracts eight to twelve, scabrid, with a few shorter outside. 

 \ A 247. picris. 



(Bracts all green, glabrous : herbs with milky juice . . t 

 Achenes flattened : pappus united at the base and falling 



together p. 252. sonchus. 



Achenes not flattened, but narrowed below the top . . . 



^ ^ A 248. crepis. 



Outer achenes at least prolonged into a slender beak which 



[ bears the pappus ,....,.,.... U 



