MORPHOLOGY OF THE LEAF. 



97 



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

 narrow base and a broader, rounded apex ; (1 1) cuneate or 

 iform, shaped like a wedge with the point backward. 



4 6 5 7 11 10 9 



320-330, Diagrams of pinnate- veined leaf-form*. 



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) auricidate, with ear- 

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

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

 shaped, the lobes directed outward, 

 as? 



Forms of leaves. 330, Silene Virgmica. 331, Magnolia Fraseri. 336, Arabia dentata. 337, Polyeonu 

 tagittnnini. 332, Hepatica acutiloba. 333, Asarum Virginicum. 331, Hydrocotyle Americana. 33 

 II. utubellata. 



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 



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