not-yet-known not-yet-known not-yet-known unknown 3.1 Scanning electron microscopy Various epicuticular and crystalloid waxes were classified using SEM to identify the micromorphological structures in the petals of S. aversiflora . In total, seven types of waxes were identified. On the adaxial surface of the petals, we observed inconspicuous smooth layers adhered to the epidermis (Figure 1A) and membranous platelets, which are flat crystalloids (Figure 1A-B). Granules were the most common. They are irregularly shaped or rounded crystalloids assuming isodiametric sizes (Figure 1B-D). Whole platelets were observed and recognized by their irregular to semicircular shapes, protruding perpendicularly in relation to the epidermis (Figure 1D). Tubules were rarely observed, found only on the adaxial surface of the smaller non-concave petals, characterized by their hollow cylindrical shape (Figure 1E). We also observed in SEM the epidermal surface of the anthers and pistil, sepals and petals. Eglandular trichomes occur on the epidermis of petals and sepals (Figure 1F), while glandular trichomes are abundant in the base of the sepals (Figure 1H) but rarely observed on the petals (Figure 1F-G). The eglandular trichomes of the sepals are restricted to the margins (Figure 1I). The anthers have an epidermis varying from sinuous in the ventral side (Figure 1J) to papillary on the dorsal side (Figure 1K), the papillae being more prominent in the apical region (Figure 1K). In the apical region, we observed the U-shaped poricidal opening of the feeding (Figure 1L) and pollinating (Figure 1M) anthers. The surface of the pistil is covered by simple trichomes and the anticlinal walls of the epidermal cells are straight (Figure 1N). The opening of the stigma resembles a slit with an enlarged opening in the center (Figure 1O). 3.2 Light microscopy