Abstract: Carex damiaoshanensis X. F. Jin & C. Z. Zheng, a new species of Cyperaceae from Guangxi, China, is described and illustrated. This new species resembles C. scaposa C. B. Clarke in its arundinaceous leaves and spikes arranged in a compound panicle, but differs from the latter in having glabrous culms, cauline leaves, and rachises of secondary inflorescences, panicle with fewer secondary inflorescences, and spikes with sparse pistillate flowers. Micromorphology of culms, cauline leaves, peduncles of secondary inflorescences, and achenes under SEM supports the recognition of this new species as well.