CH. XIII] 



THE DICOTYLEDONS 



547 



Fumitory family includes the typical flower of old-fashioned 



gardens, the Bleeding Heart. The huge Mustard family, 



with its precise cruciform flowers, includes a few ornamental 



plants, i.e. Wallflower, Sweet 



Alyssum, Rocket, Stock, and 



some which are useful as 



food, as Cabbage, Radish, 



Mustard^ Water Cress. Here 



also belongs the Rose of 



Jericho (Fig. 257), and closely 



related are the Capers and 



the Mignonette. 



ORDER 15. SARRACENIALES : 

 THE PITCHER PLANTS. A very 

 interesting group, compris- 

 ing three families and some 

 150 species of plants which are insectivorous, this habit being 

 apparently connected with acquisition of nitrogen which 

 makes good a deficiency in the environment (page 246). 

 Most prominent are the Sarracenias, familiar in our common 

 form (Fig. 48), and the Nepenthes of the East Indies, grown 



often as exotics in green- 

 houses (Fig. 49). The Sun- 

 dew (Drosera, Fig. 392), 

 and Venus Fly Trap (Di- 

 oncea, Fig. 50), and Aldro- 

 FIG. 391. Victoria Regia; x ?V vanda, a water form, have 



no pitchers, but catch 



insects in other ways. _A11 insectivorous plants except three, 

 genera (Ceghalotus, Utricularia, and Pinguicula) belong to 

 familv. 



FIG. 390. Silene species ; natural 



A polster form from the Alps. 

 (From Bonnier.) 



ORDER 16. ROSALES: THE ROSE FAMILY AND KIN. A very 

 large, diversified, and important order, of some 10,000 species, 

 of trees, shrubs, and herbs, including many of our most prom- 



