Grewia kentingensis (Malvaceae, Grewioideae), a new species from Taiwan

<i>Grewiakentingensis</i> Y.H. Tseng, Chih Y.Chang & C.Y.Lin, <b>sp. nov.</b>, a new species found on elevated coral reefs in southern Taiwan, is described. The species was previously misidentified as <i>G.piscatorum</i> Hance. <i>Grewiakentingensis</i> differs from <i>G.piscatorum</i> 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 <i>G.piscatorum</i> is designated and an identification key for the <i>Grewia</i> taxa of Taiwan is presented.