72 



Diagnosis: 



Very easily recognized by the scale -like pods and 

 the numerous . downy, clasping, nearly entire stem-leaves. 

 Variation : 



Varies enormously in size and "branching with habi- 

 tat. The fonn of the stem-loaves varies much on the 

 same plant. Sheet 2, however, seems to give fairly good 

 evidence for genotypic differences; one specimen, slight- 

 ly later than the other two but nearly as tall with flow- 

 ering barely begun, is much larger-loaved than the other 

 two J possibly , but not probably, the difference is one 

 of vigor depending on environment - the plants were grow- 

 ing within a very small area, and, as noted, did not 

 differ greatly in height. 



32. Lepidium rudorale L. 



Scientific name: 



Lepidium ruderale L. Sp. PI. 645. 1753. 



Common names: 



Roadside pepper-grass. 

 Narrow -leaved pepper-grass. 



