XIV. CEUCIFER^. 



223 



Lunaria. 

 Flower cut vertically (mag.) 



Lunaria. 

 Seed, cut both ways to show the accumbent cotyledons (mag.). 



Lunaria biennis. 



Lunaria. Seed (mag.). 



Barbarea. Diagram. 



Erysimum. Barbarea. 



Seed, entire, and cut both ways to show the incumbent cotyledons. Seed, entire and cut vertically (mag.). 



Arabis. 



Seed 



cut transversely 

 (mag.). 



Barbarea. 



Seed 



cut transversely 

 (mag.). 



Arabis. 

 Winged seed, entire and cut vertically (mag.). 



Tetrapoma barbarcefolia. 

 Transverse section of the 

 silicule, showing the four 

 placentas and the incom- 

 plete septa (mag.). 



Tetrapoma. 



Silicnle with four 



valves. 



