<i>Camchaya khongchiamensis</i> Chatan &amp; Promprom (Asteraceae: Vernonieae), a New Species From Thailand

<i>Camchaya khongchiamensis</i> Chatan & Promprom (Asteraceae), a new species from Ubon Ratchathani Province, Thailand, is described and illustrated. It is similar to <i>C. loloana</i>, but clearly different from <i>C. loloana</i> by having a larger size of capitula, involucre, receptacle, and corolla lobe. In addition, it mostly has fewer florets (18-40 [-50]) per capitulum; lower haft whitish, upper haft purplish corolla tubes; sagittate base anthers; and white except for the purple near apex style. A distribution map, pollen morphology, and a table with comparative morphological characters of the new species and its closest relative are provided, as well as the preliminary conservation assessment under the IUCN criteria.