Fig. 1.

Transverse sections of young apical parts of representative species of the perianth-bearing Piperales: (A) Aristolochia gigantea (climber); (B) A. leuconeura (climber); (C) A. grandiflora (climber); (D) A. ovalifolia (climber); (E) A. triactina (climber); (F) A. serpentaria (herb); as well as (G) Thottea siliquosa (shrub); (H) Lactoris fernandeziana (shrub); and (I) Asarum cardiophyllum (herb). In E, the hypodermal fibres are still unlignified. Sections are stained with carmine-green, colouring lignin-containing tissues in green and purely cellulosic tissues in pink; cx, cortex; f, fibre ring; p, pith; v, vessel. Scale bars = 500 μm.