EXPLANATION OF TERMS 



An Entire Leaf is one the edge of which is not cut or lobed 

 in any way. (See Rhododendron, PI. XVI., and Closed Gen- 

 tian, PL C.) 



A Simple Leaf is one which is not divided into leaflets ; its 

 edges may be either lobed or entire. (See Rhododendron, PL 

 XVI. ; also Fig. i.) 



Fig. 1. 



Fig. 2. 



Fig. 3. 



A Compound Leaf is one which is divided into leaflets, as in 

 the Wild Rose, Pink Clover, and Travellers' Joy (PL XXXI., 

 also Fig. 2). 



A Much-divided Leaf is one which is several times divided 

 into leaflets (Fig. 3). 



The Axil of a leaf is the upper angle formed by a leaf or leaf- 

 stalk and the stem. 



Flowers which grow from the axils of the leaves are said to 

 be Axillary. 



A cluster in which the flowers are arranged each on its own 

 stalk along the sides of a common stem or stalk is called a 

 Raceme. (See Cardinal-flower, PL LXXXIII. ; Shin-leaf, PL 

 XVIII.) 



A cluster in which the flower-stalks all spring from ap- 

 parently the same point, as in the Milkweeds, somewhat sug- 

 gesting the spreading ribs of an umbrella, is called an Umbel (PL 

 LXXXL). 



A cluster which is formed of a number of small umbels, all of 



