100 



KEY AND FLORA 



Pig. 18. Types of pods of CruciferoB 



A, flattened pod of Arahix, 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 (Simiiiii alba). E, dried necklace-shaped 

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

 shepherd's purse (Oapsella Bunsa-pjastorU) : 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.) (After Cosson 

 and De Saint-Pierre) 



A 



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



Pod roundish. Lepidium, IV 



Pod triangular, inversely heart-shaped. Capsella, V 



Pods r/!nbiil(ir or cijlindrical, splittiiii/ open when ripe. 

 (a) Pods gloliular. Flowers yellow. 



Lesquerella, III 



