22 



Diagnosis and variation: 



uppeT 

 The nearly entire^ Irregularly dentate. stem-leaves 



are conspicuously characteristic. The size of the plant 

 varies enormously according to the environment « and the 

 smaller plants tend to have stem-leaves more nearly en- 

 tire toward the hase* but the material collected gives no 

 trustworthy evidence of "genetic" variation, and the 

 writer's observation of the species in general suggests 

 the same conclusion as to the uniformity of the species. 



10. Brassica oampestris L* 

 Scientific name: 



Brassica compestris L. Sp. PI. 666. 1753. 

 Common names: 



Rutabaga* 



Swedish turnip* 



Swede . 



Wild navew* 

 Distribution and habitat: 



"fugitive from Burope* In cultivated grounds* some- 

 times persisting for a year or two» and occasional in 

 waste places eastward"* (6. M.). "Often a noxious 

 weed". (G. M.). 



