MORPHOLOGY OF THE LEAF. 



97 



the narrow end at base; (10) spatulate, like a spatula, with a 

 narrow base and a broader, rounded apex; (11) cuneate or cune- 

 iform, shaped like a wedge with the point backward. 



4 6 5 7 11 10 9 8 



320-330, Diagrams of pinnate- veined leaf-forms. 



291. Again: if the lowest pair of veinlets are length- 

 ened and more or less recurved, the leaf will be vari- 

 ously modified in respect to its base, becoming (12) 

 cordate, or heart-shaped, an ovate outline with a sinus 

 or re-entering angle at base ; (13) auriculate, with ear- 

 shaped lobes at base ; (14) sagittate, arrow-shaped, with tlio 

 lobes pointed, and directed backward ; (15) hastate, halbert- 

 shaped, the lobes directed outward. 





830 331 t 332 333 



Formxoflmvex. 330, Silene Virginica. 331, Magnolia Fraseri. 336, Arabis dentata. 337, Polygon urn 

 f^unib 1 !" 1 ' He P* tica acutiloba. 333, Asurum Virginicuru. 334, Hydrocotyle Americana. 335, 



292. Pinnatifid forms. The following pinnate-veined forms, 

 approaching the compound leaf, depend less upon the proportion 

 of the veinlets than upon the relative development of the inter- 



7 



