4 1 8 PHARMACEUTICAL B OT AN Y 



Ech'inate. Beset with prickles or spines. 



Ec'toplasm. A clear layer of protoplasm just beneath the cell wall. 



Egg-Appara'tus. The ovum and two synergids at the micropylar end of the 



embryo sac. 

 El'ater. An elastic spiral filament attached to the spores of some Liverworts 



and Horsetails and aiding in their dispersal when mature. 

 Emar'ginate. Notched at the apex. 

 Em'bryo. A rudimentary plant found wi f hin the seed. 

 Embryol'ogy. The study of the embryo and its development. 

 Em'bryo-sac. A large cell within the nucleus of the ovule in which the embryo 



is formed after fertilization. 

 En'docarp. The inner layer of the pericarp. 

 Endoder'mis. A layer of cells forming the innermost boundary of the cortex 



and surrounding the fibrovascular region. 

 En'dogen. A Monocotyledon. 

 Endogenous. Applied to the axes of Monocotyl plants that do not increase 



materially in diameter. 



En'dophyte. A plant which grows within the tissues of another. 

 En dosperm. A mass of cells formed in the embryo sac of ovules a, they mature 



to form seeds. 



En'dospore The inner wall of a spore. 



Endothe'cium. A zone of one or more layers within the exothecium of an anther 

 En'sif orm. S word-shaped. 

 Entomoph'ilous. Insect pollinated. 

 En'tophyte. See Endophyte. 



Ephem'eral. Lasting for a brief period (a day o r so;. 

 Epica'lyx. A whorl of bracts resembling the calyx but below it. 

 Epi'carp. The outer layer of the pericarp. 



Epicot'yl. The portion of the embryo axis above the cotyledon or cotyledojis. 

 Epider'mis. The outer covering layer of ceUs of plants, sometimes later replaced 



by cork. 



Epig'ynous. Applied to floral leaves that appear to be inserted upon the ovary. 

 Epipet'alous. Upon the corolla. 

 Ep'iphyte. An air plant. A plant growing on another plant but not necessarily 



nourished by it. 



Epithe'lium. A delicate layer of cells lining an internal cavity. 

 Eq'uitant. Applied to leaves, as in Iris, when they all spring from a rhizome 



and are successively folded on each other toward their bases. 

 Eryth'rophyll. The red coloring matter of leaves. 

 Estiva'tion (Aestivation). The arrangements of the floral organs in the flower 



bud. 

 Etae'rio. An aggregate fruit like the Raspberry or Blackberry, the product 



of a single flower, consisting of an aggregation of drupelets on a receptacle. 

 E'tiolation. The bleaching of green parts of plants when kept in the dark for 



some time. 



