GLOSSARY iii 



deliquescent. Said of trees in which the leader or main trunk disappears 

 at the tree-top, forking into several or many main branches. 



determinate. See centrifugal. 



dichogamy. The condition when stamens and pistils in the same 

 flower mature at different times ; this prevents or hinders self- 

 pollination. Sie.& proterandrozis and proterogynous. 



diclinous. Said of flowers that are imperfect, — lacking either stamens 

 or pistils. 



dicotyledon. Having two cotyledons or seed-leaves. 



digestion. Change in the food materials whereby they may be trans- 

 ported, or used in assimilation. Starch is changed into sugar in 

 the plant by a process of digestion. 



dimorphous. Of two forms ; as flowers that bear two kinds of stamens. 



dicecious. Said of plants that bear stamens and pistils in flowers on 

 different plants. 



drupe. A fleshy pericarp or fruit, containing a relatively large stone or 

 pit, as peach, cherry, plum. 



drupelet. A very small drupe, particularly one comprising part of an 

 aggregate fruit, as a drupelet of raspberry. 



embryo. The dormant plantlet comprising part of the seed. It is 

 enclosed within the seed-coats. Its parts are the caulicle (or 

 stemlet), cotyledons or seed-leaves, and plumule. The food may 

 be stored in the embryo, or around the embryo (endosperm). 



endogen. A plant of the monocotyledon class, not enlarging in diam- 

 eter by means of outside rings ; as palms. All grasses and lilies 

 and orchids and cereal grains are of this kind. Now used, if at 

 all, to express a general mode of growth rather than a class of 

 plants. See exogen. 



endosperm. The food material that is packed around the embryo 

 (rather than inside it) in the seed. 



entomophilous . Said of flowers that are pollinated by insects. 



environment. The surroundings ; or the conditions in which a plant 

 or animal lives. The environment comprises the soil, climate, and 

 the influence of the other plants and animals with which or among 

 which the plant or animal grows. 



epicotyl. The internode or "joint" above the seed-leaves or cotyledons. 



epidermis. The outermost layer or part of the cortex ; the skin. 



epigeal. Said of seeds (as common bean) in which the cotyledons or 



seed-leaves rise above ground in germination. See hypogeal. 

 epiphyte. A plant that grows on another plant, or on other objects 

 above ground, but which does not derive much or any of its nour- 

 ishment from its host ; an air-plant. 



