222 GLOSSARY OF BOTANICAL TERMS. 



DRUPE, a single-seeded fruit, fleshy, with a hard stone, as in the 



cherry, plum, and peach. 

 DURAMEN, the heart-wood or ripened portion of exogenous trees. 



ECHINATE, spiny like a hedgehog. 



ELLIPTIC, oval but acute at each end. 



ELONGATED, lengthened out. 



EMARGINATE, having a small notch at the end. 



EMBRYO, the rudiments of the young plant as enclosed in the 



seed. 

 EMBRYO-SAC, the cavity in which the germinal vesicle is developed 



in the nucleus. 



EMERGED, a water plant having its summit only above the surface. 

 ENDOCARP, the inner layer of the pericarp, as in the stone of the 



cherry, the core of the apple, &c. 

 ENDOGENS, plants having the stem composed of confused woody 



bundles, with cellular tissue between, both forming a cylin- 

 drical caudex. 

 ENDOSMOSE, the phenomenon of two liquids of unequal density 



separated by a membrane, mingling and becoming of equal 



density ; passing inwards. 

 ENDOSPERM, the albumen of seeds. 



ENDOSTOME, the opening through the tegmen at the micropyle. 

 ENDOPHLEUM, the inner bark or liber. 

 ENSIFORM, shaped like a sword with a straight blade. 

 ENTIRE, said of any organ not cut or divided, or of a leaf not cut 



or toothed, but plain on the edge. 



EPICALYX, an outer calyx, composed of either sepals or bracts. 

 EPICARP, the outer covering of the fruit, as the skin of the cherry, 



peach, and apple. 

 EPIDERMIS, the external cellular layer covering leaves, flowers, 



and young branches. 



EPIGYNOUS, organs apparently seated upon the ovary. 

 EPIPETALOUS, growing upon the petals. 

 EPIPHYTES, plants growing upon others. 

 EQUITANT, leaves folded and embracing, or clasping each other, 



as in the Iris. 



ERECT, standing perpendicular to that from which it springs. 

 EROSE, gnawed or bitten, irregularly toothed. 

 ET^ERIO, the aggregated little drupes in the bramble. 

 ETIOLATED, blanched by being deprived of light. 

 EXALBUMINOUS, without albumen, as in the pea. 

 EXCURRENT, extending beyond the point. 

 EXOGEN, plants with the wood deposited in concentric rings or 



circles, forming a cylindrical trunk. 

 EXOSMOSE, passing outwards. See ENDOSMOSE. 

 EXOSTOME, the opening through the testa at the micropyle. 

 EXSERTED, stamens are so when extending beyond the corolla. 

 EXSTIPULATE, having no stipules. 



