56 



FORM OR FIGURE. 



268. PINNATIFID FORMS. The following pinnate-veined forms, ap- 

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



130 181 132 183 



Forms of leaves. 130, Silene Virpinica. 181, Magnolia Fraseri. 136, Arabis dentaU. 

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

 cotyle Americana. 15, H. 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. 

 139, Q. alba (white oak) lobate-sinuate. 140, Q. ira-rocarpa 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 runcinate, 

 i. e.j re-uncinate. When the terminal segment of a pinnatifid leaf is 



