446 



ILLUSTRATIONS OP 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 irregular. Calyx of two sepals, or 

 unequally five-parted. Corolla bilabiate, personate ; the very short 

 tube spurred. Stamens two, inserted on the upper hp 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. — -Er. Utricularia (Bladderwort), Pin- 

 guicula. Unimportant plants. 



867. Ord. OrobanchaceJE {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 

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



S'IG. 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. 96Q. 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 placentae. 963. A highly magnified seed. 964. 

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



J'IG. 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. 



