66 



FORM OK noURE. 



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

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



137 136 185 



180 181 



Forma of leaves. ISO, Sllene Virpnica.. 181, Magnolia Fraseri. 130, AraMs dentata, 

 1 8T, Polygonum arifolium. 1.12. Ilepatica aoutiloba. 133, Asarum Virginioum. 1:J4, Hyrtro- 

 cotylo Americana. 135, II. umbellata. 



veinlets than upon the relative development of the intervening tissue. 

 The Y>Te1ix pinnated is obviously used in contrast vfith. palmated among 

 palmate-veined forms. 



142 139 188 140 Ml 



Feather-Teined leaves, approaching tlie compound. 13S, Qnorcus imbricaria — undulat«. 

 189, Q. alba (white oalc)— lohate-sinnate. 140, Q. n'aerocarpn — lyi-ate. 141, Mulgedium (milk- 

 woed). 142, Biplnnatifid leaf of Ambrosia artemisifolia (bog-woed). 



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 barkward it becomes r/rTruiftr/c, 

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



