2S5] FLORA OF COLUMBIA AND VICINITY 143 



422. O. montana Engelm. [C aurea occidentalis Engelm.: 

 Capnoides montanum (Engelm.) Britton]. 



Thickets along hillsides; common; the capsules of plants 

 from the uplands are often minutely pruinose when fresh, 

 approaching thus C. crystallina Engelm.; the capsules, how- 

 ever, of typical C. crystallina Engelm. from plants from 

 southwestern Missouri are very densely pruinose. 



South Dakota to Montana; Texas to Utah and Arizona; 

 Missouri. 



Family 47. CRUCIFERAE Juss. Mustard family. 



167. LEPIDIUM L. Pepper grass. 



423. L. Virginicum L. 



Waste places; frequent. 



Quebec to Minnesota and South Dakota; Florida to 

 Texas; West Indies and Mexico: naturalized in Europe. 



424. L. apetalum Willd. \L. intermedium. Gray]. 

 Fields and waste places. 



Maine to New York and Texas across the continent: 

 Asia: adventitious in Europe. 



168. SISYMBRIUM L. Hedge mustard. 



425. S. officinale (L.) Scop. 



Waste places, especially about dwellings; common. 

 Europe and Asia, thence to North America. 



169. SINAPIS L. [BRASSICA L.]. Mustard. 



426. S. alba L. {B. alba Boiss.]. White mustard. 

 Waysides; scarce. 



Europe and Asia, thence to North America. 



170. BRASSIOA L. Kale. 



427. B. nigra (L.) Koch. Black mustard. 

 Frequent in fields and waste places. 

 Europe, thence to North America. 



