Fig. 4.

a Cross-section of lateral sepal with collateral vascular bundles (vb) in parenchyma (ad adaxial (inner) surface, ab abaxial (outer) surface, TBO). b Lateral sepal—staining for proteins (ABB), idioblasts with raphides (r) present in parenchyma. c Lateral sepal—staining for insoluble polysaccharides (PAS), raphides (r). d Lateral sepal—staining for lipids (SBB), numerous lipid bodies in cells. e The abaxial surface of petal built by polygonal cells with straight walls (SEM). f The apex and inner (adaxial) surface of petal with polygonal cells with the U-shaped walls (SEM). g The three-cellular trichomes (one basal cell and two protruding cells) rarely present on adaxial petal surface (SEM)