310 GLOSSARY. 



Drupe. A fruit with hard pit (endocarp) and soft exterior (exocarp) 

 (e.g. Plum, Cherry, Peach). 



Dry-rot. A kind of decay in wood. 



Dust blanket. A layer of loose earth on the surface of the ground. 



Embryo. The miniature plant in the seed. 



Erosion. Wearing away. 



Evergreen. Holding leaves over winter or longer until new leaves 

 appear. 



Family. In botanical classification, a group of plants thrown to- 

 gether because of some natural common resemblances. 

 Sometimes used synonymously with order. 



Firebreak. An opening, ploughed strip of land, or anything which 

 prevents the spread of fires in forests or elsewhere. 



Fire falls. Applied to areas where the trees have fallen owing to 

 their roots having been burned off. 



Flower. A part of the plant especially modified for the reproduc- 

 tion of the plant by seed. 



Forest. A dense growth of trees. 



Forest floor. The decayed leaves and twigs which cover the soil 

 in forests. 



Forestry. The growing of trees in groups. 



Frost-hardy. Said of trees the new growth of which is not easily 

 killed by frost. 



Frost-tender. Said of trees the new growth of which is easily 

 killed by frost. 



Fruit. The seed-containing area derived from a single flower. 



Fungi. Plural of fungus. 



Fungous. Pertaining to fungi. 



Fungus. A flowerless plant devoid of chlorophyll and drawing 

 its nourishment from living organisms or decayed organic 

 matter. 



Genera. Plural of genus. 



Generic name. The name of the genus to which the plant be- 

 longs and which, with the name of the species forms the 

 scientific name of the plant. 



Genus. In botanical classification a group of plants having sev- 

 eral or many natural common resemblances; a division of 

 a family. 



Germination. The act or process by which a seed or spore gives 

 rise to a new and independent plant. 



Glabrous. Smooth, not pubescent. 



Glauber salts. Sodium sulphate. 



