538 



APPENDIX 



e / g hi 



FIG. 2. Tips of leaves 



a, acuminate or taper-pointed; 6, acute; c, obtuse; d, truncate; e, retuse; /, 

 emarginate or notched ; g (end leaflet) , obcordate ; h, cuspidate, the point 

 sharp and rigid; i, mucronate, the point merely a prolongation of the 

 midrib 



FIG. 3 



A, shapes of bases of leaves: 1, heart-shaped; 2, arrow-shaped; 3, halberd-shaped. 

 -B, peltate leaf of tropaeolum 



