KEY TO CULTIVATED HERBS AND POTTED SHRUBS 



335 a Plant covered with white-woolly hairs; ray flowers 



white above, lilac beneath; leaves thick, coarsely 



toothed Arctotis. p 236 



b Plants not completely as in a 336 



336 a Ray flowers yellow; leaves rough and often hairy 



Helianthus. p 235 

 b Plants not completely as in a 337 



337 a Achenes with a pappus of capillary bristles 



Callistephus. p 235 

 b Achenes with pappus wanting 338 



338 a Heads %-% in. broad Achillea ptarmica. p 236 



b Heads i in. or more broad Chrysanthemum, p 237 



339 a Plants without leaves; stems cylindric or flattened, 



usually with prickles 340 



b Plants with leaves 341 



340 a Stems flattened Epiphyllum. p 189 



b Stems cylindric Cereus. p 189 



341 a Flowers with a spur on the corolla or perianth 342 



b Flowers not with a spur 344 



342 a Leaves with petiole attached to the under side of blade 



Tropaeolum. p 178 

 b Leaves with petiole attached to the margin of blade. . 343 



343. a Sepal petal-like, spurred Impatiens. p 184. 



b Sepals not petal-like, the petal spurred Viola, p 187 



344 a Leaves with spiny teeth ; a yellow sap exuding when 



plant is broken Argemone. p 755 



b Plants not as in a 345 



345 a Flowers with a distinctly green calyx and a colored 



corolla 346 



b Flowers with the perianth undifferentiated into calyx 



and corolla 391 



346 a Flowers more or less irregular 347 



b Flowers regular 355 



347 a Corolla more or less tubular, the petals not distinct .... 348 

 b Corolla not tubular, the petals distinct 352 



348 a Corolla split down one side to the base; anthers coher- 



ing about the style Lobelia, p 217 



b Flowers not completely as in a 349 



349 a Leaves 3-12 in. broad, broadly heart-shaped, covered 



with glandular hairs; fruit with long, curved horns 



Martynia. p 212 

 b Leaves not completely as in a 350 



350 a Leaves 3-10 in. long, with toothed margins. Digitalis. p2ll 

 b Leaves with entire margins 351 



351 a Flowers %-i in. long, blue Echium. P 203 



b Flowers 1-2 in. long, variously colored 



Antirrhinum majus. p 210 



101 



