II] 



SHAPE OF LEAF 



23 



very often, botanists accept the following derived figures 

 (Fig. 7). 



Fig. 7. Outlines of leaves. 1 subulate; 2 ovate; 3 cordate; 4 deltoid; 

 5 sagittate; 6 reniform; 7 lanceolate. The petiole and base to the left. 



Here we see the base is broader than the apex, or 

 may be drawn out as it were into rounded or acute corners, 

 giving subulate (1), ovate (2), cordate (3), deltoid (4), 

 sagittate (5), reniform (6), lanceolate (7) as easily recog- 

 nised types. 



Fig. 8. Outlines of leaves. 1 spathulate ; 2 obovate; 3 obcordate. 

 Petiole and base to the left. 



In another series of cases the fundamental simple 

 geometrical form is modified by the apex instead of the 



