Objective: To study leaf ultrastructure in varieties of Chrysanthemum morifolium.
Method: The ultrastructure of leaves was observed through the transmission electron microscope.
Result and conclusion: Chloroplast, mitochondria, starch grains and peroxide were observed in the ultrastructure of leaves, but the organelle, ultrastructure and their quantity showed differences in various cultivars. The results may explain, why hangju'has a better resistance to the adversity and is planted in large scale.