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Details of transverse sections showing the degree of secondary growth in (A, B) Asarum cardiophyllum; (C) Saruma henryi; (D) Lactoris fernandeziana; (E), Aristolochia ovalifolia; (F) A. triactina; (G) A. lindneri; (H) A. clematitis; (I) Thottea siliquosa; and (J) Hydnora longicollis. Sections are stained with carmine-green. Scale bars = 50 μm.
