Outline of a bilobed, peltate leaf (typical of e.g., Passiflora coriacea) demonstrating method of measurement. a Distance from petiolar base to nectary b Length of petiole c Degree peltate (distance from point of petiolar insertion to leaf base) d. Length of central vein. c+d = leaf length e Length of lateral vein f Width of leaf g Angle between primary lateral veins.