Tetramolopium stemmermanniae sp. nov. (Asteraceae), a new species found at Pōhakuloa Training Area, Hawaiʻi Island

<p>A new species endemic to Hawaiʻi Island, <em>Tetramolopium stemmermanniae</em>, is described and illustrated. Molecular and morphological evidence support <em>Tetramolopium stemmermanniae</em> as being distinct from<em> Tetramolopium arenarium </em>var. <em>arenarium</em>, <em>Tetramolopium consanguineum</em> ssp. <em>leptophyllum</em>, and <em>Tetramolopium humile </em>ssp. <em>humile</em>, which occur at Pōhakuloa Training Area, Hawaiʻi Island. <em>Tetramolopium stemmermanniae</em> shares an upright and multibranched habit as that of <em>Tetramolopium arenarium </em>var. <em>arenarium</em> and <em>Tetramolopium consanguineum</em> ssp. <em>leptophyllum.</em> It differs in ray and disc flower color and number, and in having an open, paniculate inflorescence. We provide a description of the new taxon, include a key to the <em>Tetramolopium</em> species of Hawaiʻi, and a brief description of the habitat where it occurs.</p>