Abstract
Tarenna nitidula, from West Africa is here divided into two separate species, T. nitidula s.s. and the new species T. harleyae, which is described and illustrated here. Tarenna harleyae differs from T. nitidula s.s. by its corolla tubes 6–8 mm long, glabrous inside (vs. 3–5 mm, puberulous), and calyx lobes 1–1.5 mm long (vs. < 1 mm long). Tarenna harleyae is found in the tropical lowland forest in Sierra Leone, Guinea, Liberia and Ivory Coast, while T. nitidula occurs from Guinea-Bissau to Ivory Coast.
References
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<p>Cheek, M., Lopez Poveda, L. & Molmou, D. (2015) <em>Tarenna hutchinsonii</em> (Rubiaceae) redelimited, and <em>T. agnata</em> described from W Africa. <em>Kew Bulletin</em> 70: 12. https://doi.org/10.1007/s12225-015-9560-2</p>
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<p>De Block, P., Razafimandimbison, S.G., Janssens, S., Ochoterena, H., Robbrecht, E. & Bremer, B. (2015) Molecular phylogenetics and generic assessment in the tribe Pavetteae (Rubiaceae). <em>Taxon</em> 64: 79–95. https://doi.org/10.12705/641.19</p>
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<p>IUCN (2012) <em>IUCN Red List Categories and Criteria, version 3.1. </em>Ed. 2. IUCN Species Survival Commission, Gland & Cambridge.</p>
<p>Keay, R.W.J. (1963) <em>Tarenna</em>. <em>In</em>: Hepper, F.N. (ed.) <em>Flora of west tropical Africa</em>, 2nd Ed., vol. 2. Crown Agents for oversea governments and administrations, pp. 133–136.</p>
<p>Cheek, M., Lopez Poveda, L. & Molmou, D. (2015) <em>Tarenna hutchinsonii</em> (Rubiaceae) redelimited, and <em>T. agnata</em> described from W Africa. <em>Kew Bulletin</em> 70: 12. https://doi.org/10.1007/s12225-015-9560-2</p>
<p>Degreef, J. (2006) Revision of continental African <em>Tarenna</em> (Rubiaceae-Pavetteae). <em>Opera Botanica Belgica</em> 14: 1–150.</p>
<p>De Block, P., Razafimandimbison, S.G., Janssens, S., Ochoterena, H., Robbrecht, E. & Bremer, B. (2015) Molecular phylogenetics and generic assessment in the tribe Pavetteae (Rubiaceae). <em>Taxon</em> 64: 79–95. https://doi.org/10.12705/641.19</p>
<p>Gaertner, J. (1788) <em>De Fructibus et Seminibus Plantarum</em> 1. Stutgardiae Typis Academiae Carolinae. https://doi.org/10.5962/bhl.title.102753</p>
<p>Hiern, W.P. (1877) Rubiaceae. <em>In</em>: Thiselton-Dyer, W.T. (Ed.) <em>Flora of tropical Africa</em>, vol. 3. L. Reeve and co., London, pp. 33–247.</p>
<p>IUCN (2012) <em>IUCN Red List Categories and Criteria, version 3.1. </em>Ed. 2. IUCN Species Survival Commission, Gland & Cambridge.</p>
<p>Keay, R.W.J. (1963) <em>Tarenna</em>. <em>In</em>: Hepper, F.N. (ed.) <em>Flora of west tropical Africa</em>, 2nd Ed., vol. 2. Crown Agents for oversea governments and administrations, pp. 133–136.</p>