Abstract
<i>Parasenecio pentaphylla</i>, a new species of the genus <i>Parasenecio</i> from Mt. Ilwol-san, Ilwol-myeon, Yeongyang-gun, Gyeongsangbuk-do, Korea, is described and illustrated here. In Korea, this species has been recognized as <i>P. adenostyloides</i>, known to be a Japanese endemic species. However, it is clearly distinguished from <i>P. adenostyloides</i> by its involucre shape, the number of phyllaries, the number of florets per capitulum, and the ratio of the tube length to the throat length. A molecular phylogenetic analysis using the Internal Transcribed Spacer region also clearly indicated that <i>P. pentaphyllaria</i> was genetically distinct from <i>P. adenostyloides</i>. Therefore, it is recognized as an independent species, different from <i>P. adenostyloides</i>. The specific epithet “<i>pentaphyllaria</i>” was given based on its characteristic of having five phyllaries.
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