184 WILD FLOWER PRESERVATION 



frequently contains Albumen. Sectional cut- 

 ting of a seed. (126) 



The Embryo is the rudimentary plant, and 

 when fully formed it consists of one or two 

 Cotyledons (or seed-leaves), a Plumule (or bud 

 of a stem), and the Radicle (or origin of the 

 future root). (127, A to D) 



A. Embryo of Bean split open. 



B to D. The plantlet at later stages. 



Monocotyledons are plants whose embryos 

 have only one seed-leaf or cotyledon. 



Dicotyledons are plants whose embryos have 

 two seed-leaves. 



The Covering or shell of the seed generally 

 consists of two coats. The Testa is the outside 

 coat and the principal one. It may be hard, 

 crusty, woody, or thin and skin-like. The 

 Tegmen is the inner coat of the seed. 



The Albumen is the embryo's food-store. 



THE CLASSIFICATION OF PLANTS. 



Plants are divided and subdivided into 

 groups according to the number of features 

 they have in common. All plants and groups 

 of plants have their names. These show their 



