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GLOSSARY. 
Dichotomous. Forking by pairs. 
Dicotyledonous. Having two cotyledons. 
Didymous. Twin ; found in pairs. 
Didynamous (stamens). In two pairs of unequal length. 
Diffuse. Widely or loosely spreading. 
Digitate. Compound, with the members borne in a whorl at the apex of 
the axis. 
Dimerous. Having all the parts in twos. 
Dimidiate. In halfs, as if one half were were wanting. 
Dimorphous. Occurring in two forms. 
Dioecious. With the two kinds (male or female) of flowers on separate 
plants. 
Discoid. Resembling a disk. Discoid head, in Composite, one without 
ray flowers. 
Disk. A development of the receptacle at or around the base of the pis- 
til. In Composite, the tubular flowers of the head as dis- 
tinct from the ray. 
Dissected. Cut into numerous segments. 
Distichous. In two vertical ranks. 
Distinct. Separate; not united ; evident. 
Divaricate. Widely divergent. 
Divergent. Inclined away from each other. 
Divided. Lobed to the base. 
Dorsal. On or relating to the back or outer surface of an organ. 
Drupaceous. Resembling or in the nature of a drupe. 
Drupe. A fleshy or pulpy fruit with the inner portion of the pericarp 
(1-celled and 1-seeded, or sometimes several celled), hard or 
stony; prunes, peaches. 
E or Ex. A prefix; has often a privative significance, as “ ebracteate,” 
without bracts. 
Echinate. Beset with prickles. 
Effuse. Very loosely spreading. 
Elliptical. In the form of an ellipse; oval. 
Emarginate. Having a shallow notch at the extremity. 
Embryo. The rudimentary plantlet within the seed. 
Endocarp. The inner layer of a pericarp. 
Endogenous. Growing throughout the substance of the stem, instead of 
by superficial layers. 
Entire. Without toothing or division. 
Ephemeral. Lasting only for one day. 
Epidermis. The cuticle or thin membrane covering the outer surface. 
Epigynous. Growing on the summit of the ovary, or apparently so. 
Epiphyte. A plant growing attached to another plant, but not parasitic ; 
an air-plant. 
