87, 88.] 



LEAF- ARRANGEMENT. 



103 



a branch), when from the branches. Their 

 arrangement on the axis is according to the following 

 general modes : 



Alternate, one above another on opposite sides, as 

 in the Elm. 



Scattered, irregularly spiral, as in the Potato vine. 



Rosulate, clustered regularly, like the petals of a 

 Rose, as in the Plantain and Shepherd's-purse. 



291, Lady's-slipper (leaves alternate); 292, Synandra grandiflora (leaves opposite) ; 294, Medeola Virginica 

 (leaves verticillate) ; 293, Larix Americana (leaves fasciculate). 



Fasciculate, tufted, clustered many together in the 

 axil, as seen in the Pine, Larch, Berberry. 



Opposite, two, against each other, at the same node. 

 Ex., Maple. When successive pairs of opposite leaves 

 cross each other at right angles, they are said to be 

 decussate. 



Verticillate, or whorled, more than two in a circle 

 at each node, as in the Meadow-lily, Trumpet-weed. 

 We may reduce all these modes to TWO GENERAL TYPES, 



