Abstract
Pentzia arabica, previously known only from a few collections from Yemen, is reported also from Jabal Samhan in Oman. This is the first record of a Pentzia in Oman, and the locality is the northernmost and easternmost known for the genus. A map of the distribution of P. arabica and its presumed sister species, P. somalensis in Somalia, is presented. Apart from these two species in the Horn of Africa region, the disjunct Pentzia comprises 26 species in southern Africa and two species in North Africa.
References
<p class="Reference">IUCN (2012) <em>IUCN Red List Categories and Criteria: Version 3.1 ed. 2.</em> IUCN, Gland, Switzerland and Cambridge, UK.</p><p class="Reference">Källersjö, M. (1988) A generic re-classification of <em>Pentzia</em> Thunb. (Compositae-Anthemideae) from southern Africa. <em>Botanical Journal of the Linnean Society</em> 96: 299–322.</p><p class="Reference"> <a href="https://doi.org/10.1111/j.1095-8339.1988.tb00686.x">https://doi.org/10.1111/j.1095-8339.1988.tb00686.x</a></p><p class="Reference">Magee, A.R., Nicolas, A.N., Tilney, P.M. & Plunkett, G.M. (2015) Phylogenetic relationships and generic realignments in the early diverging subtribe Pentziinae (Asteraceae, Anthemideae). <em>Botanical Journal of the Linnean Society</em> 178: 633–647.</p><p class="Reference"> <a href="https://doi.org/10.1111/boj.12295">https://doi.org/10.1111/boj.12295</a></p><p class="Reference">Magee, A.R. & Tilney, P.M. (2012) A taxonomic revision of <em>Pentzia</em> (Asteraceae, Anthemideae) I: the <em>P. incana</em> group in southern Africa, including the description of the new species <em>P. oppositifolia</em> Magee. <em>South African Journal of Botany</em> 79: 148–158.</p><p class="Reference"> <a href="https://doi.org/10.1016/j.sajb.2011.10.003">https://doi.org/10.1016/j.sajb.2011.10.003</a></p><p class="Reference">Mallon, D.P. (2011) Global hotspots in the Arabian Peninsula. <em>Zoology in the Middle East</em> 54, Suppl. 3: 13–20.</p><p class="Reference"> <a href="https://doi.org/10.1080/09397140.2011.10648896">https://doi.org/10.1080/09397140.2011.10648896</a></p><p class="Reference">Patzelt, A. (2014) <em>Oman Plant Red Data Book.</em> Diwan of Royal Court, Oman Botanic Garden, Sultanate of Oman, 312 pp.</p><p class="Reference">Patzelt, A. (2015) Synopsis of the flora and vegetation of Oman, with special emphasis on patterns of plant endemism. <em>Jahrbuch der Abhandlungen der Braunschweigischen Wissenschaftlichen Gesellschaft</em> 2014: 282–317.</p><p class="Reference">Thulin, M. (2001) <em>Pentzia</em> (Asteraceae-Anthemideae) in the Horn of Africa region. <em>Nordic Journal of Botany</em> 21: 249–252.</p><p class="Reference"> <a href="https://doi.org/10.1111/j.1756-1051.2001.tb00763.x">https://doi.org/10.1111/j.1756-1051.2001.tb00763.x</a></p><p class="Reference">Thulin, M. (2004) Horn of Africa. <em>In:</em> Mittermeier, R.A., Robles Gil, P., Hoffmann, M., Pilgrim, J., Brooks, T., Goettsch Mittermeier, C., Lamoreux, J. & da Fonseca, G.A.B. (Eds.) <em>Hotspots revisited: earthʼs richest and most endangered ecoregions</em>. Cemex, Mexico City, pp. 276–283.</p><p>Thunberg, C.P. (1800) <em>Prodromus plantarum capensium 2.</em> Edman, Uppsala, 191 pp.</p>