However, the crystals are not found on multicellular trichomes, but in single-celled idioblasts. Calcium oxalate crystal druses line the airspaces found at the base of the petals. The stamens of lotus have a short filament with the anther about twice as long as the filament. The anther contains four pollen sacs. The pollen grains of lotus are tripunctate with a convoluted surface.
Lotus flowers are able to regulate their own temperature.
All parts of the flower have been shown to contribute to the generation of heat. The exact mechanism by which lotus generates heat is unknown. It is believed through calorimetric experiments that the energy comes from the breakdown of carbohydrates. However, no studies have been done to look at this at a microscopic level. The receptacle and stamen filaments contain starch, the presumed energy resource.