The morphogenesis of inflorescence,flower and fruit of Thyrocarpus glochidiatus was observed under stereomicroscope and scanning electron microscope(SEM).The results showed:(1)The inflorescence of T.glochidiatus came from the splits of the first spherical inflorescence primordium,and its development way conformed to the cincinnus rather than drepanium or bostryx.And the floral primordium in the inflorescence formed one after one and every floral primordium has a subtending bract primordium.Floral primordium initiated in the axil of last bract.Two adjacent floral primordial were alternate.(2)The pentamerous flowers were typically tetramerous and the floral organs initiated in centripetal order:calyx primordia,corolla primordia,androecium primordia,gynoecium primordia;though the androecium primordia appeared after the corolla primordia,they grew quicker than the latter,so the floral organs developed in incompletely centripetal order:calyx primordia,androecium primordia,corolla primordia,gynoecium primordial.(3)The ovary with four deep clefts had formed in the early stage of gynoecium primordium.(4)The two layers of the nutlet were formed by the upper part of the marginal organization growing inward and upward and the base growing circumferential tissue outside.