New Mesoamerican Species of <i>Dichorisandra</i> and <i>Tradescantia</i> sect. <i>Mandonia</i> (Commelinaceae)

Two new species of Commelinaceae are described from the Neotropics. <i>Dichorisandra amabilis</i> J. R. Grant, widespread from southern Mexico to Panama, consists of erect herbs formerly included in <i>D. hexandra</i> (Aublet) Standley, which is here restricted to scandent plants. <i>Tradescantia petricola</i> J. R. Grant, disjunct from Costa Rica to Venezuela, belongs to <i>Tradescantia</i> sect. <i>Mandonia</i> D. R. Hunt.