PER8QNALE8. 



499 



Order Acanthaceee. The Acanthus Family. Herbs, mostly of 

 the tropics, numbering about 1500 species. Thirty-five or forty species 

 occur in North America, mostly, however, in the South and West. 

 Some of the exotic species are grown in conservatories, e.g., Justicia. 

 Thunbergia, etc. 



Order Pedaliaceae. Herbs with glandular hairs. The most im- 

 portant species are the Asiatic Sesamum Indicum and S. orientale, 

 whose seeds yield an oil much used as food by the inhabitants of the 

 tropics. 



Martynia proboscidia, the Unicorn Plant of the Southwestern United 

 States, is notable for its two-hooked fruits. 



Order Bignoniaceae. Mostly woody plants, numbering about 500 

 species, and natives, for the most part, of the tropics. Many are cul- 



FIGS. 419-22. ILLUSTRATIONS OF SCKOPHULARIACE^: (Scrophularia, pp.). 



FIG. 419. 



FIG. 420. 



FIG. 421. 



FIG. 422. 



Fig. 419.- 

 Fig. 421.- 



-Flower. 

 -Pistil. 



Magnified. 

 Magnified. 



Fig. 420. Section of flower. 

 Fig. 422. Diagram of flower. 



tivated for their fine flowers among: these are the species of Bignonia ; 

 Tecoma, etc. 



Catalpn bignonioides, the Common Catalpa of the Southern United 

 States, is a fine tree for shade and ornament. Its wood is said to be 

 very durable. C. speciosa is much hardier than the preceding. 



Crescentia Cujete, the Calabash Tree of tropical America, produces a 

 large pulpy fruit whose hard rind is used as a water-vessel. 



Order Gesneraceee. Mostly tropical plants, represented by AfM- 

 menes, Gloxinia, Oesnera, etc., cultivated in conservatories. 



Order Columelliaceae. Evergreen trees or shrubs of tropical 

 America. 



Order Lentibulariacese. The Bladderwort Family. Mostly 

 aquatic or marsh plants, of temperate and warm regions, interesting on 

 account of the insect-catching bladders of the aquatic species. (For 



