100 



KEY AND FLORA 



Fig. 18. Types of pods of Cruciferoe 



A, flattened pod of Arabis, seeds.in a single row in each cell: s, cross section 

 of pod, showing flattening parallel to the partition. B, pod of Radicula 

 palustris, seeds in several rows. C, nearly cylindrical pod of Sisymbrium. 

 D, beaked pod of white mustard (Sinapis alba). E, dried necklace-shaped 

 and beaked pod of radish (Saphanus Raphanistrum) . F, flattened pod of 

 shepherd's purse {Capsella Bursa-pastoris) : s, cross section, showing flat> 

 tening at right angles to the partition. G, flattened pod of Lepidium cam- 

 pestre ; s, cross section, showing flattening at right angles to the partition. 

 (The pods natural size, the sections somewhat magnified.) (Alter Cosson 

 and De Saint-Pierre) 



A 



Pods short and flattened, contrary to the partition, splitting open when ripe. 



Pod roundish. Lepidium, IV 



Pod triangular, inversely heart-shaped. Capsella, V 



Pods globular or cylindrical, splitting open when ripe. 

 (a) Pods globular. Flowers yellow. 



Lesquerella, HI 



