9f> VASCULAR PLANTS. 



nerved valves. Seeds oo , globose, 1-seriate in 

 each valve. 



0. %. flowers yellow. 



12. Caulanthus, Watson. 



Sepals equally saccate. Petals undulate. 

 Siliqua elongated, terete, sessile; valves 1- 

 nervecl. Seeds go, oblong, 1-seriate in each 

 valve. 



0. flowers purple, whitish. 



13. Cheiranthus, L- 



Lateral sepals saccate. Petals unguiculate. 

 Siliqua laterally compressed; replum broad; 

 valves 1-nerved. Seeds compressed, 1-seriate 

 in each valve. 



0.00. flowers yellow, orange, purple. 



14. Streptanthus, Nutt. 



Sepals colored, and equal. Petals uudulate. 

 Siliqua laterally compressed; valves flattened, 

 1-nerved. Seeds oo , 1-seriate, marginate, com- 

 pressed. 



0.00. flowers purplish, or yellowish. 



15. Arabis, L- 



Petals not undulate. Siliqua laterally com- 

 pressed, linear; valves flattened, with promi- 

 nent nerve. Seeds oo, 1-seriate, compressed, 

 marginate. 



. 0. IX . flowers purple, white. 



