446 



ILLUSTRATIONS OF THE NATURAL ORDERS. 



buoyant, sometimes evanescent or wanting, or when produced in 

 the air entire and somewhat fleshy, clustered at the base of the 

 scape. Flowers showy, very in-egular. 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 co- 

 rolla: anthers confluently one-celled. Ovary free, one-celled with, a 

 free central placenta ! bearing numerous ovules. Seeds destitute of 

 albumen. Embryo straight. — Ex. Utricularia (Bladderwort), Pin- 

 guicula. Unimportant plants. 



8G7. Ord. OrobailcliaceSB {Broom-Rape Family). Herbs, destitute 

 of green foliage, and with scales in place of leaves, parasitic on the 

 roots of other plants. Corolla withering or persistent, with a bila- 

 biate or more or less irregular limb. Stamens four, didynamous, 



inserted on the corolla. Ovary free, one-celled, with two parietal 

 placentte ! which are often two-lobed, or divided. Capsule enclosed 



FIG. 958. Branch of Epiphegus Virginiana (Beech-drops), nearly of the natural size : the 

 lower flowers, with short imperfect corollas, alone producing ripe seeds. 959. A flower en- 

 larged. 960. Longitudinal section of the same. 961. Longitudinal section of the ovary, more 

 magnified, showing one of the parietal placentiB covered with minute ovules. 962. Cross-sec- 

 tion of the same, showing the two parietal placentae. 963. A highly magnified seed. 964. 

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



FIG. 965. Aphyllon uniflorum. 966. A flower about the size of nature. 967. The same 

 laid open, showing the didynamous stamens and the pistil. 968. A magnified anther. 969. A 

 magnified seed. 970. Section of the same. 



