56 



FORM OB FIGURB. 



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

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



130 181 182 



Forms of leaves. ISO, Silene Yirginica. 181, Magnolia Fraseri. 186, Arabia dentato, 

 18T, Polygonum arifoliiim. 183, Hepatica aoutiloba. 18S, Asarum Virginicum. 184, Hydro- 

 cotyle Americana. 185, II. umbellata. 



veinlets than upon the relative development of the intervening tissue. 

 The T^reQx pinnated is obviously used in contrast vfith. palmated among 

 palmate-veined forms, i 



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

 ISfl, Q. alba (white oak)— lobate-sinuate. 140, Q. n-.aorocarpa— lyrate. 141, Mulgedium (milk- 

 weed). 142, Bipinnatifld 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., re-uncinate. When the terminal segment of a pinnatifid leaf is 



