CllUCIFEB^!. 



207 



jElh ionema memlranaceum. 



MUiionema crista! inn. 



Fig. 302. 

 Fruit dehiscing. 



Fig. 303. 

 Fruit. 



is in the form of the silicule, which may be elliptical, oblong, glo- 

 bular, didymous, cordiform, obcuneiform, or cymbiform ; the valves 



may be flat, compressed, 



convex, navicular, carinate, 



bearing a double dorsal crest, 



or even four, six, or ten wings, 



as in the genera Menon- 



villea, Hexaptera, and Dec- 



aptera. The number of 



ribs on the valves is also of 



some use in distinguishing 



these genera. Next come 

 the vegetative organs, the leaves, the inflorescence. Some 



genera are herbaceous ; others, like Bra- 

 c/iycarpaa, are suffrutescent. Nocccea 

 comprises scapigerous herbs. The leaves 

 are linear entire in Brac/iycarpced ; the 

 cauline ones are auriculate in Campy- 

 loptera and Sc/iouwia. They are all 

 opposite in Eunomia ; but this is the 

 case with the inferior ones only in 

 jffilhionema proper. All are pinnatifid in 

 certain species of Hexaptera, pinnatisect 

 in Nocccea. The inflorescence is in form 

 racemose in most of the genera, corym- 

 bose in Mancoa. PJiysalidium has the 

 leaves of certain Saxifrages ; and in 

 this, like the other series, such a cha- 



Psychine stylosa. 



Capsella Bursa-pasloris 

 {Shepherd's purse). 



Fig. 304. 

 Habit (A). 



Fig. 305. 

 Fruit (f.) 



Fig. 306. 



Young fruit (§). 



