Abstract: This paper reports on the atavistic spikelets of Carex da-bieensis and C. polyschoena. One of the types in the atavistic spikelets of them has quite the same structure as those of Kobresia and Schoenoxiphium. In the form of spikelets they bear a male flower above the female. As Figure Ⅰ shows that type(3) of the atavistic spikelets in C. dabieensis, C. polyschoena is not foundamentally different from types l and 2 of Schoencxiphium, Kobresia. The discovery of the atavistic spikelets demo-nstrate that a unit of utricle is a ture spikelet of Carex, and may prove that the unisexual spikelets of presentday Carexare derived from anccstors with bisexual spikelets. It is the-refore possible to believe that the discovery of the atavistic spikelets with bisexual structure exhibites further the phylogentic interrelationship between Schoenoxiphiun, Kobresia and Carex of the Caricoideae.