FOHMS OF FOLIAGE-LEAVES. 



113 



serve to illustrate our meaning here. In the Mallow, 



there are several ribs of 

 about the same size, radiat- - 

 ing from the end of the 

 petiole, something like the 

 spread-out fingers of a hand. 

 The veining in this case is 

 therefore described as digi- 

 tate, or radiate, or palmate. 

 The leaflet of the Clover, on 

 ■■'the other hand, is divided 

 I exactly in the middle by a 

 single rib (the mid-rib), and 

 -from this the veins are given off on each side, so that 

 the veining, on the whole, presents the appearance of a 

 feather, and is, therefore, described as pinnate fpenna, a 

 feather). rf 



'- 169. Both sim^e and compound leaves exhibit these 

 two modes of venation. Of simple pinnately-veined 

 leaves, the, Beech, Mullein, and 

 willow supply familiar instances. 

 The Mallow, Maple, :Q--rape, Cur- 

 rant, and Gooseberry have simple 

 radiate - veined leaves. Sweet- 

 Brier (Fig. 43), Mountain Ash, 

 and Rose'have compound pinnate 

 leaves, whilst those of Virginia- 

 Creeper (Fig. 144), Horse-Chest-nut, and Hemp are 

 Compound digitate. 



Fig. 143.— Palmately-lobed leaf of Maple. 

 Fig. 141.— Palmate leaf of Virginia Creeper. 



Fig. 144. 



