THE MONOPETALOUS ORDERS. 



443 



832. Ord, LentibulaceSB (the Bladderwort Family). Herbs, grow- 

 ing in water, or wet places, with the flowers on scapes ; the leaves 

 either submersed and dissected into filiform segments resembling 

 rootlets, and commonly furnished with air-bladders to render them 

 buoyant ; or, when produced in the air, entire and somewhat 

 fleshy, clustered at the base of the scape. Flowers showy, very 

 irregular. Calyx of two sepals, or unequally five-parted. Corolla 

 bilabiate, personate ; the very short tube spurred. Stamens two, 

 inserted on the upper lip of the corolla : anthers one-celled. Ovary 

 free, one-celled, with a free central placenta ! bearing numerous 

 ovules. Fruit a capsule. Seeds destitute of albumen. Embryo 

 straight. Ex. Utricularia (Bladderwort), Pinguicula. Unimpor- 

 tant plants. 



833. Ord, OrobancliaceSB (the Broom- Rape Family). Herbs, des- 



titue of green foliage, and with scales in place of leaves, parasitic 



FIG. 841. Branch of Epiphegus Virginiana (Beech-drops), nearly of the natural size: the 

 lower flowers, with short imperfect corollas, alone producing ripe seeds. 842. A flower en- 

 larged. 843. Longitudinal section of the same. 844. Longitudinal section of the ovary, more 

 magnified, showing one of the parietal placentae covered with minute ovules. 845. Cross-sec- 

 tion of the same, showing the two parietal placentae. 846. A highly magnified seed. 847. Sec- 

 tion of the same, exhibiting the minute embryo next the hilum. 



FIG. 848. Orobanche uniflora, reduced in size. 849. A flower about the size of nature. 

 850. The same laid open, showing the didynamous stamens and the pistil. 851. A magnified 

 anther. 852. A magnified seed. 853. Section of the same. 



