Fig. 3.

Habit of flower and micromorphology of the spur of Ascocentrum curvifolium; (C–F) scanning electron micrographs. (A) Inflorescence bearing weakly zygomorphic, orange–red flowers with purple iridescence. Scale bar = 4 mm. (B) Bisected flower showing relative positions of column, labellum and nectary spur. Scale bar =1·5 mm. (C) Epidermis lining nectary spur with hairs and nectar residues (arrow). Scale bar = 50 µm. (D) Glabrous epidermis lining distal part of spur. Scale bar = 50 µm. (E) Secretory hairs with smooth cuticle and nectar residues (arrow). Scale bar = 20 µm. (F) Smooth cuticle covering surface of secretory epidermis with nectar residues. Scale bar = 25 µm. Abbreviations: see Fig. 1.