DICOTYLEDONOUS, embryo having two cotyledons. DICTYOGENOUS, applied to monocotyledons having netted veins. DIDYNAMOUS, two long and two short stamens. DIFFUSE, scattered. DIGITATE, compound leaf, composed of several leaflets attached to one point. DIGYNOUS, having two styles. DIMEROUS, when the parts of a flower are in twos. DIMIDIATE, when one-half of an organ is smaller than the other half. DIŒCIOUS, staminiferous and pistilliferous flowers on separate plants. DIPLOSTEMONOUS, stamens double the number of the petals or sepals. DIPTEROUS, having two wings. DISCOID, in the form of a disk or flattened sphere; _discoid pith_, divided into cavities by disks. DISK, a part intervening between the stamens and the pistils in the form of scales, a ring, etc. DISKS, the peculiar rounded and dotted markings on the fibres of coniferous wood. DISSECTED, cut into a number of narrow divisions. DISSEPIMENT, a division in the ovary; true when formed by the edges of the carpels, false when formed otherwise. DISTICHOUS, in two rows on opposite sides of a stem. DIVARICATING, branches coming off from the stem at a very wide or obtuse angle. DODECANDROUS, having twelve stamens. DOLABRIFORM, shaped like an axe. DORSAL, applied to the suture of the carpel which is furthest from the axis. DOUBLE FLOWER, when the organs of reproduction are converted into petals. DRUPE, a fleshy fruit like the cherry, having a stony endocarp. DRUPELS, small drupes aggregated to form a fruit, as in the raspberry. DURAMEN, heart-wood of dicotyledonous trees. E ELATERS, spiral fibres in the spore-cases of _Hepaticæ_. ELLIPTICAL, having the form of an ellipse. EMARGINATE, with a notch at the end. EMBRACING. This is said to be the case when a leaf clasps the stem. EMBRYO, the young plant contained in the seed. EMBRYO-SAC, the cell in which the embryo is formed. ENDOCARP, the inner layer of the pericarp, next the seed. ENDOCHROME, the coloring matter within the cells of the lower plants. ENDOGEN, a monocotyledon. ENDOPHLŒUM, the fibrous inner bark or liber. ENDOPLEURA, the inner covering of the seed. ENDORHIZAL, numerous rootlets arising from _within_ a common radicle, and passing through sheaths, as in endogenous germination. ENDOSMOSE, movement of fluids inward through a membrane. ENDOSPERM, albumen formed within the embryo-sac. ENDOSTOME, the inner foramen of the ovule. ENDOTHECIUM, the inner coat of the anther. ENSIFORM, in the form of a sword, as the leaves of _Iris_. ENTIRE (_integer_), without marginal divisions. ENVELOPES, FLORAL, the calyx and corolla. EPICALYX, outer calyx formed either of sepals or bracts, as in mallow and _Potentilla_. EPICARP, the outer covering of the fruit. EPICHILIUM, the terminal portion of the lip (_labellum_) in orchids.