KEY FOR JUNE TO NOVEMBER 



292 a Principal bracts of the involucre in i row with a few 



shorter outer ones Senecio. p 238 



b Bracts of the involucre in several rows, the outer usually 



successively shorter Solidago. p 228 



293 a Corolla more or less tubular, the petals joined at least 



toward the base 294 



b Petals separate, not joined into a tube 315 



294 a Flowers regular 295 



b Flowers more or less irregular 305 



295 a Leaves reduced to mere scales on the stem. .Bartonia. p 199 

 b Leaves not reduced to scales 296 



296 a Uppermost leaves of stem with bases clasping or ex- 



tending down the stem Symphytum p 203 



b Uppermost leaves not completely as in a 297 



297 a Flowers % in. or less long 298 



b Flowers more than -/4 in. long 300 



298 a Leaves in whorls on the stem Galium. p 213 



b Leaves alternate on the stem 299 



299 a Style thread-like, extending beyond the tube; corolla 



lobes erect, not spreading Onosmodium. p 203 



b Style not completely as in a; corolla lobes spreading 



Lithospermum. p 203 



300 a Leaves densely covered with woolly hairs. Verbascum. p 210 

 b Leaves not densely covered with woolly hairs 301 



301 a Corolla conspicuously tubular 302 



b Corolla not conspicuously tubular; petals only slightly 



united at the base 303 



302 a Flowers solitary in the axils of the leaves. .Physalis. p 209 

 b Flowers in panicles or racemes Nicotiana. p 209 



303 a Stamens 5, alternating with 5 conspicuous sterile sta- 



mens Steironema. p 198 



b Stamens 5-7, sterile stamens wanting or small and scale- 

 like 304 



304 a Corolla segments linear; flowers in dense oblong heads 



Naumbergia. p 198 



b Corolla segments not linear; flowers not completely as 

 in a s Lysimachia. p 



305 a Corolla with a distinct spur at the base 306 



b Corolla not with a spur at the base 307 



306 a Spur straight Linaria. p 210 



b Spur bent upward Impatiens. p 184. 



307 a Flowers solitary in the axils of the leaves 308 



b Flowers not solitary in the axils of the leaves 309 



308 a Calyx subtended by 2 bractlets; perfect stamens 2 



G ratio la. p 211 

 b Calyx not subtended by 2 bractlets; perfect stamens 4 



Melampyrum. p 212 



45 



