Right-angled mixture triangles (RMT) depicting the macronutrient balance of Quercus crispula, Salix bakko, Malus toringo, Elaeagnus umbellata, Alnus firma, Clethra barbinervis, Robinia pseudoacacia, and Betula ermanii leaves in early and late May. The RMT on the left a is early May, while the RMT on the right b is late May. Crude protein is represented on the implicit axis which varies inversely with distance from the origin (the dashed gray line indicates 25% protein content).