KEY FOR JUNE TO NOVEMBER 



345 a Perianth not differentiated into green calyx and colored 



corolla Caltha. p 152 



b Perianth differentiated into green calyx and colored 



corolla 346 



346 a Plant with thick, obovate, jointed stems covered in 



patches with prickles Opuntia. p 189 



b Plants not completely as in a 347 



347 a Petals 4 348 



b Petals 5 or more 362 



348 a Ovary inferior; stamens usually 4 or 8 349 



b Ovary superior; stamens usually 6 or numerous 351 



349 a Stamens 4 Ludzuigia. p 189 



b Stamens 8 3 50 



350 a Stamens equal in length; usually coarse herb. .Onagra. p 190 

 b Stamens unequal in length Kneiffia. p 190 



351 a Stamens 9 or more 352 



b Stamens 6 or less 353 



352 a Leaves compound with 3 leaflets Polanisia. p 160 



b Leaves simple Helianthemum. p 186 



353 a Stamens 4; leaves with entire margins Linum. p 178 



b Stamens 6, 2 of them shorter 354 



354 a All leaves entire or toothed, not noticeably fleshy 355 



b At least the lower leaves pinnately lobed or divided. . 357 



355 a Leaves with their bases clasping the stem; pods obpvoid 



Camelina. p 159 

 b Leaves not with clasping bases 356 



356 a Leaves 1-4 in. long, lanceolate Erysimum. P 159 



b Leaves i in. or less long, linear-oblong ....Alyssum. P 159 



357 a Flowers a /4 in. or less broad 358 



b Flowers usually % in. or more broad 360 



358 a Basal leaves with terminal lobe only i or 2 times 



larger than the lower lateral ones Roripa. P 158 



b Basal leaves with terminal lobe several times larger 



than the lateral ones 359 



359 a Leaves dark green, often shining; flowers usually num- 



erous and conspicuously clustered at top of stem 



Barbarea. p 158 

 b Leaves green, not shining; flowers 1 A in. or less broad, 



not completely as in a Sisymbrium. P 157 



c Leaves not shining; flowers %-% in. broad. Brassica. p 158 



360 a Pods % in. or more thick, constricted between the seeds, 



spongy Raphanus. p 158 



b Pods not completely as in a 361 



361 a Pod with the beak or tip flattened, sword-shaped, as 



long as pod Sinapis. p 158 



b Pod with the beak or tip conic, not sword-shaped 



Brassica. p 158 



48 



