Abstract
Grewiakentingensis Y.H. Tseng, Chih Y.Chang & C.Y.Lin, sp. nov., a new species found on elevated coral reefs in southern Taiwan, is described. The species was previously misidentified as G.piscatorum Hance. Grewiakentingensis differs from G.piscatorum in its habit (procumbent vs. erect to ascending shrub), leaf length (<2 cm vs. up to 7 cm), breeding system (gynodioecious vs. trioecious), smaller flower diameter, fewer stamens, and smaller pollen grains. Color photographs, line drawings, and pollen images of the new species are provided. Additionally, a lectotype for G.piscatorum is designated and an identification key for the Grewia taxa of Taiwan is presented.