122 



FUMARIACE./E. 



[CLASS 



OBSERVE the irregular corolla, one of the petals being 

 gibbous at the base. In Dicentra, common in cultivation, 

 both of the outer opposite petals are similarly gibbous : 

 the anther of the middle stamen of each bundle of three 

 is 2-celled, of the lateral stamens I -celled. 



6. Natural Order Cruciferse. The Crucifer Family. 



DISTRIBUTION. Represented in both hemispheres to 

 the limits of vegetation, both in latitude and altitude ; by 

 far most abundant, however, in Southern Europe and 

 temperate Asia. Rare between the Tropics or absent 

 excepting in mountainous regions. British genera 28, 

 species 66. 



Herbs. Sepals 4. Petals 4. Stamens tetradynamous. 



Type Common Wallflower (Cheiranthus Cheiri.) 



An herbaceous, plant, somewhat woody below, with 



alternate entire exstipulate leaves, and racemose ebract- 



eate flowers. 



Deviations from the Type in this very large Order are 

 unimportant so far as the general aspect of the species is 

 concerned ; depending principally upon modifications of 

 the fruit and seeds. In some few species 2, in others 4 of 

 the stamens are undeveloped. In one exotic species the 

 stamens are numerous. They thus ]ose the typical tetra- 



