Abstract
This paper is concerned with the plant hydrodynamics on the opening and closing of a flower head. The capitulum movement was observed with time-lapse photography technique. The morphological structure of petal and leaf surface was studied experimentally. The microscopic observation of the petal surface and the surface of involucral scale was performed using the three-dimensional laser scanning microscope. The time variation in surface roughness of the dandelion and catsear petals was revealed. The variation in surface roughness composed of surface cells was interpreted from the viewpoint of the plant hydrodynamics.
