Fig. 1.

Aristolochia fimbriata, flower morphology and epidermal differentiation of the perianth. (A and E) Sagittal section through flowers at S6 (A) and S9 (E) stages. (B and F) Detail of fimbriae at S6 (B) and S9 (F); note hooked trichomes. (C and G) Secretory multicellular, conical trichomes on the adaxial epidermis of the tube at S6 (C) and S9 (G). (D and H) Detail of the utricle adaxial epidermis with osmophores surrounded by secretory, filamentous multicellular trichomes. (I–K) Detail of the abaxial epidermis of the limb (I), tube (J) and utricle (K), with scattered stomata. Arrowheads: osmophores; f, fimbriae; g, gynostemium; lb, limb; t, tube; u, utricle. Scale bars: 1 mm (A); 100 µm (B–D, I, K); 5 mm (E); 50 µm (F–H, J).