Tarenna harleyae Jongkind, sp. nov. (Fig. 2, 3) Type:— LIBERIA. Sino: ca. 50 km E of Greenville, 5°04.5’ N, 8°34.5’ W, 152 m, 11 March 2014 (fl.), C . C. H. Jongkind, D. M. Mulbah, E. Harris, J. S. Charleson & J. Forkpah 12363 (holotype BR; isotypes E, G, K, LISC, MO, P, WAG [WAG.1577083]). Diagnosis:—Resembling Tarenna nitidula (Bentham 1849: 390) Hiern (1877: 90) in the habit, the calyx pubescent outside, and the corolla glabrous outside; it differs by the corolla tube 6–8 mm long, glabrous inside (vs. 3–5 mm long, puberulous in T. nitidula), calyx lobes 1–1.5 mm long (vs. 90,000 km ², which greatly exceeds the values needed for a threatened category under criterion B. The species is not rare and is known from Sapo National Park and Gola National Park, and most likely to occur in other protected areas as well. A substantial part of the herbarium specimens was collected relatively recently, and most of its original populations are still extant. Therefore, T. harleyae is provisionally assessed here as Least Concern (LC) according to the IUCN Red List Categories and Criteria (IUCN, 2012). Note: —The height of fertile plants of T. harleyae, as noted on the labels, is very variable, it looks like this species can start flowering when still relatively small. A few flowering specimens, cited here under the new species, were mentioned already by Degreef (2006: 106) as being somewhat different from most other T. nitidula plants. Tarenna nitidula (Bentham) Hiern (1877: 90). Basionym: Stylocoryne nitidula Bentham (1849: 390). Type: SIERRA LEONE. s.l., s.d. [1841] (fr.), J. R. T. Vogel 147 (first-step lectotype designated by Degreef (2006: 104); second-step lectotype K [barcode K000411773], here designated). Notes: Bentham described Stylocoryne nitidula Bentham (1849: 390) and cited two gatherings from Sierra Leone: 1) Vogel s.n., 2) Whitfield s.n., and he did not state in which herbarium they are deposited. Degreef (2006: 104) cited J. R. T. Vogel 147 at K as the lectotype of S. nitidula. However, there are two specimens of Vogel 147 at K, with barcodes K 000411773 and K 000411775. The specimen with barcode K 000411773 has the label “147 S. Leone, Stylocoryne nitidula, Niger Expedition, Vogel”; this specimen is here designated the second-step lectotype. Diagnostic characters: Calyx lobes 1–1.5 mm long. Corolla tube 3–5 mm long, throat pubescent. Most leaf blades gradually narrowing to an often long-acuminate apex, glabrous below with a crackled surface (dry) due to impressed tertiary veins; domatia, when present, glabrous. Distribution and habitat: —Distributed from Guinea-Bissau to Ivory Coast; growing in forest undergrowth and thickets, often on slopes.

Published as part of Jongkind, Carel C. H., 2021, Tarenna harleyae (Rubiaceae), a new forest species from West Africa, pp. 209-214 in Phytotaxa 520 (2) on pages 211-214, DOI: 10.11646/phytotaxa.520.2.8, http://zenodo.org/record/5508931