Trees of Neiv York State 



"33 



Leaf Classificutian — 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 jind without apparent reliculum. 



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 appear 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, scalv spike. 



(Fig. 40). 



