16 INTRODUCTION. 



Wkorled (Fig. 26. )> when several leaves grow in a circle round 

 the stem. 



Fasciculate or Tufted (Fig. 27.), when several leaves spring 

 from one point. 



Imbricated (Fig. 28), when one leaf lies over another, like the 

 tiles or slates on the roof of a house. 



Decussated (Fig. 29.), in pairs alternately crossing each other. 



Two-ranked, spreading in two directions. 



Unilateral, all inclining one way. 



With respect to direction, they are 



Close-pressed to the stem. 



Erect or Upright, forming a very acute angle with the stem. 



Vertical, standing quite erect. 



Spreading, forming a moderately acute angle with the stem. 



Horizontal, standing off at right angles. 



Reclinate, inclining downwards. 



Rejected, bent backwards. 



Inflected, bent inwards. 



Depressed, root-leaves pressed close to the ground. 



Floating, leaves lying flat on the surface of the water. 



Immersed or submersed, under water. 



Emerged, standing out of the water. 



With respect to insertion, Leaves are 



Embracing (Fig. 30.), when they clasp the stem with their base. 



Connate or growing together (Fig. 31.), united at their base. 



Perfoliate (Fig. 32.), when the stem runs through the leaf. 



Sheathing, investing the stem or each other with a sheath 



Equitant or Riding (Fig. 33.), disposed in two opposite rows, 

 and embracing each other at the base. 



Decurrent (Fig. 34.), running down the stem or branch so as 

 to form a leafy border. 



Peltate or Shield-shaped (Fig. 35.), when the stalk is inserted 

 into the middle of the leaf. 



Leaves are Simple or Compound. A Simple Leaf, is one which 

 consists of a single piece, whether sessile or stalked. A Com- 

 pound Leaf is one which consists of several pieces connected by 

 insertion into a common footstalk. In simple leaves there are to 



