56 



FORM OR FIGURE. 



268. Pinnatifid forms. The following pinnate-veined forms, ap- 

 proaching the compound leaf, depend less upon the proportion of the 



137 13G 135 



130 131 132 133 



Forms of leaves. 130, Silene Virginica. 181, Magnolia Fraseri. 136, Arabis dentate. 

 18T, Polygonum arifolium. 132, Hepatica acutiloba. 133, Asarum Virginicum. 134, Hydro- 

 cotyle Americana. 135, II. umbellata. 



veinlets than upon the relative development of the intervening tissue. 

 The prefix pinnated is obviously used in contrast with palmated among 

 palmate-veined forms. 



Feather-veined leaves, approaching the compound. 138, Quercas imbricaria — undulate, 

 138, Q. alba (white oak) — lobate-sinuate. 140, Q. Jraerocarpa— lyrate. 141, Mulgedium (milk- 

 weed). 142, Bipinnatifid leaf of Ambrosia artemisifolia (hog-weed). 



269. Pinnatifid [pinna, feather, findo, to cleave) feather-cleft, 

 the tissue somewhat sharply cleft between the veinlets about half way 

 to the midvein, forming oblong segments. When the segments of a 

 pinnatifid leaf are pointed and curved backward it becomes r uncinate, 

 t. e., re-uncinate. When the terminal segment of a pinnatifid leaf in 



