Comparative anatomical characters of leaf transverse sections. A, J, H, Q. Petiole pulvinus; B, K. Petiole; C, L. Rachis; D, M. Petiolule pulvinus; E, N, I. Midrib; F, O, R. Leaf blade; G, P. Leaf margin; A–I. The new Derris samples and J–R. D. solorioides. dr, druse crystal; sc, schizogenous cavity; ly, lysigenous cavity. Scale bars: 50 µm (R); 100 µm [G (below), F (below), I, P (below), O (below)]; 500 µm [(A–E, F (above), G (above), H, J–N, O (above), P (above), Q)].