172 



HUTCHINSON'S POPULAR BOTANY 



FIG. 212. A HARICOT BEAN ON THE SECOND DAY 

 AFTER PLANTING, 



And the same with the cotyledons (c c) laid open to show the plumule (p). 

 The radicle 0) is partly hidden behind the left-hand cotyledon. 



Grass, Rush, Sedge, Palm, Lily, Orchis, 

 and Arum orders in fact, the greater 

 number of plants with parallel-veined 

 leaves are Monocotyledons ; while most 

 plants with net-veined leaves, whose name 

 is legion, are Dicotyledons. The two great 

 classes of Flowering Plants (Monocotyledons 

 and Dicotyledons) have other characteristic 

 differences, many of which will be found 

 referred to in succeeding chapters. Thus 



or Acotyledons ; those with 

 only one cotyledon, or 

 Monocotyledons ; and those 

 with two cotyledons, or 

 Dicotyledons. The import- 

 ance of this classification 

 will be apparent when it 

 is added that by far the 

 greater number of known 

 plants fall under one or 

 another of these three 

 divisions. Sea-weeds, 

 Fungi, Liverworts, Mosses, 

 Ferns, and all other crypto- 

 gamic plants belong to the 

 first division they are 

 Acotyledons ; plants of the 



FIG. 214. THE SAME WITH THE COTYLEDONS 

 LAID OPEN. 



FIG. 213. A HARICOT BEAN ON THE 

 FIFTH DAY AFTER PLANTING, 



Showing the plumule breaking its way through 

 between the cotyledons. 



the parts of the flower of a 

 Monocotyledon are usually 

 arranged in threes or sixes 

 three petals, three sepals, three 

 stamens, and so on : while the 

 floral organs of a Dicotyledon 

 are generally arranged in fours 

 or fives. The structure of the 

 stem in each is also essentially 

 different. 



