Abstract: The trichome type，density and color on the epidermis of leaves and flowers of florist’s chrysanthemum and pyrethrum were investigated utilizing Scanning Electron Microscopy（SEM）and fluorescence microscopy. Capitate glandular trichomes and T-shaped non-glandular trichomes were found on both species. The capitate glandular trichomes were distributed on both sides of the leaves，and the corolla of disc florets，but only on the abaxial surface of ray florets of florist’s chrysanthemum. In the case of pyrethrum they were also found on both sides of leaf surfaces and disc floret corollas，and in this case on the opposite adaxial surface of ray florets. The highest density of capitate glandular trichomes was detected on the surface of ovaries of pyrethrum. Remarkably they were few or not observed on chrysanthemum ovaries. The T-shaped non-glandular trichomes were distributed on the epidermis ofleaves，involucre and stalks of both species，but none on the ray and disc florets. Under UV light capitate glandular trichomes were blue on leaves of both species，but on the disc and ray florets of pyrethrum a few green ones were observed. The fluorescence color of the capitate glandular trichomes on the ovaries changed from red to blue with the development of the pyrethrum flower. By contrast，the T-shaped non-glandular trichomes were yellow under blue fluorescence of both species，and it appeared blue under UV light. The relationships between trichome differences and insect resistance were discussed.

Key words: florist’s chrysanthemum, pyrethrum, trichome, microstructure, fluorescence