KEY TO CULTIVATED HERBS AND POTTED SHRUBS 



320 a Leaves variegated by lines or rows of various colors 



Calathea. p 138 

 b Leaves not variegated as in a Amaranthus. p 148 



321 a Flowers numerous, collected into a dense head which is 



subtended by an involucre of several bracts 322 



b Flowers not arranged completely as in a 339 



322 a Leaves all basal Bellls. p 230 



b Leaves not all basal 323 



323 a Plant white-woolly throughout; bracts of involucre very 



showy, variously colored, in several rows 



Xera nth e mum. p 234. 

 b Plants not completely as in a 324 



324 a Outer flowers in the head with corolla obliquely 5-cleft, 



tubular, somewhat irregular but not strap-shaped 



Centaurea cyanus. p 240 

 b Flowers not completely as in a 325 



325 a Flowers blue to purple, in heads 2-4 in. broad; outer 



bracts of involucre leaf-like, toothed Stokesia. p 24.0 



b Plants not completely as in a 326 



326 a All leaves with entire margins 327 



b Leaves with toothed margins 331 



327 a Leaves mostly petioled 328 



b Leaves sessile 329 



328 a Ray flowers 6-15, the rays lobed. .Coreopsis lanceolata. p 235 

 b Ray flowers wanting; bracts of involucre very showy 



Helichrysum. p 233 



329 a Ray flowers in several rows, yellow or orange 



Calendula, p 235 

 b Ray flowers in i or 2 rows 330 



330 a Leaves with clasping bases; pappus of capillary bristles 



Aster novae-angliae. p 231 

 b Leaves not with clasping bases; pappus of scales 



Boltonia. p 230 



331 a Petioles of lower leaves winged; ray flowers purple to 



crimson Brauneria. p 234 



b Plants not completely as in a 332 



332 a Leaves 2-8 in. broad, ovate-heart-shaped, angled, 



toothed, with red or purple veins beneath . Cineraria, p 238 

 b Leaves not completely as in a 333 



333 a All flowers of the head regular, none with strap-shaped 



corollas 334 



b At least some of the flowers of the head with strap- 

 shaped corollas 335 



334 a Leaves with clasping bases; heads Vz-i in. broad 



Emilia, p 234 

 b Leaves not with clasping bases Gaillardia. p 234 



100 



