446 



ILLUSTRATIONS OF THE NATURAL ORDKRS. 



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 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 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. OrobancliacetE {Broom-Rope 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 

 placenta^, ! 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. 9C0. Longitudinal section of the same 961 Longitudinal section of the ovary, more 

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

 tion of the same, showing the two parietal placenta? 963 A highly magnified seed. 931. 

 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 9^.8 A magnified anther. 969. A 

 magnified seed 970. Section of the same 



