Figure 1.

Distribution and aspect of secretory trichomes. (A,B) Overview of inflorescences at the flowering stage. Note the compact arrangement of bracts subtending the flowers with exposed corolla at anthesis (A) and the developing flower buds (B). The arrowhead indicates the removal of a bract. (C) Adaxial surface of a young bract showing numerous trichomes (arrows). (D,E) Detail of the secretory trichomes at different stages of expansion. Note the structure of the shield and a film of secretion covering its surface. The dotted area (in yellow) delimits the central disc. (br = bract; cc = central cells; fb = floral bud; fc = flower corolla; rc = ring cell; se = secretion; wc = wing cell).