448 



ILLUSTRATIONS OF THE NATURAL ORDERS. 



five-lobed, convolute in aestivation ! Stamens four and didynamous, 

 or only tivo, the anterior pair being abortive or obsolete. Ovary 

 two-celled, with the placentse in the axis, often few-ovuled. Seeds 

 (sometimes only one or two in each cell) usually supported by 

 hooked processes of the placenta, destitute of albumen. The classi- 

 cal Acanthus is the type of this large and chiefly tropical order : its 

 gracefully lobed and sinuated leaves furnished the ornament of the 

 Corinthian capital. They are emollient plants, or some of them 

 bitter or slightly acrid : of little economical use. Several are culti- 

 vated for ornament. 



873. Ol'd. ScrophulariaceSB {Figwort Family). Herbs, or some- 

 times shrubby plants, with opposite, verticillate, or alternate leaves. 



977 971 974 979 975 976 



Corolla bilabiate, or more or less irregular ; the lobes imbricated in 

 estivation. Stamens four and didynamous (Fig. 407), the fifth or 

 upper stamen sometimes appearing in the form of a sterile filament 



FIG. 971. Branch of Gerardia purpurea. 972. Corolla, of the natural size, laid open. 973. 

 Calyx and style of the same. 974. Magnified transTerse section of the capsule, with one of the 

 Talvcs removed. 



FIG. 975. Gratjola aurea, natural size. 976. Corolla laid open, showing the two perfect 

 etamcns and two rudimentary fllamenta as well as the pistil. 977. The perfect stamens and 

 sterile filament of Chelone. 978. Flower of a Linaria (Toadflax). 



