leaflet shape
measured on the terminal leaflet of the third trifoliate leaf according to the ratio of length (1) to width (W). See figure 2
Legend:
Round L / W < 1.5
Ovate L / W 1.5-2
Ovate-lanceolate L / W 2-3
Lanceolate L / W 3-6
Hastate L / W > 6