Morphology Structure of Leaf Epidermis of Genus Spiraea in Heilongjiang Province

A study on morphology structure of epidermis of the genus Spiraea in Heilongjiang province was conducted with scanning clectron microscope(SEM).The result shows that epidermal cells are irregular-shaped and polygonal,the anticlinal wall are strait-arched,sinuated,sinuolate;most of species do not have trichomes,only a little species have trichomes on upper epidermal cells or lower epidermis cells and only the cells of upper epidermal have trichomes;Stomatal apparatus are located in the lower epidermis,all of them are anomocytic,cyclocytic and atypical actinocytic;the inner margin of the outer stomatal rim is glabrous,candida,sinuous and sinuolate;uni-layered outer stomatal rim or double layer;having not T-pieces at the polar region of guard cells,having notably T-pieces at the polar of guard cells.The result provides morphological basis of phylogeny and taxonomic significance for the Spiraea plants of Heilongjiang province.