﻿Trees of Neiv York State 



33 



Leaf Classificati&n — Continued 



G. Leaves Classified as to Venation — Continued 



2. As to direction of veins with reference to each other. 



a. Netted, anastomosing to form a network or 



reticulum. 



b. Parallel, parallel and without apparent reticulum. 



Palmate and Pinnate Venations 



INFLORESCENCES 



The flowering part of a plant, especially the disposition of flowers 

 on a plant, is known as the inflorescence. Inflorescences have 

 received distinctive names which indicate the various sorts, but 

 all are reducible to two main types, the indeterminate and the 

 determinate, which occasionally intergrade to form a mixed 

 inflorescence. Inflorescences may be classified as follows: 



I. Indeterminate inflorescence. Axis of inflorescence terminated 

 by a growing point which may prolong the floral 

 axis indefinitely. Flowers from axillary buds. 



a. Solitary. Said of flowers when they ai)pear solitary 



in the axils of normal foliage leaves. 



b. Clustered. Said of flowers when they are aggregated 



in groups. Foliage leaves are reduced to bracts 

 or disappear altogether. 

 1. Simple clusters. Secondary axis terminated by 

 a flower. 



(a) Spike. Flowers all sessile along the main 



axis. (Fig. 39.) 



(b) Catkin or anient. A flexuous, scaly spike. 



(Fig. 40). 



