Abstract
A new species of Rigiolepis (Ericaceae) from the island of Sulawesi, R. argentii Mustaqim & Ardi, is described. The new species is known from three locations, two in Sulawesi Selatan Province (Mount Sesean in Toraja Utara Regency and Eran Batu in Enrekang Regency) and one in Sulawesi Barat Province (Mamasa Regency). This species is similar to R. moultonii (Merr.) J.J. Sm., but differs by the persistent hairs on the abaxial surfaces of the leaves, the basal marginal glands in a shorter distance (1–2 mm) to from the petiole, bracteoles borne on the lower half of the pedicels, cup-shaped calyx tube, longer filaments (2 mm), and cupular fruits.
References
<p>Argent, G. (2019) <em>Rigiolepis</em> and <em>Vaccinium</em> (Ericaceae) in Borneo. <em>Edinburgh Journal of Botany</em> 76 (1): 55–172. https://doi.org/10.1017/S0960428618000276</p>
<p>Arnott, G.A.W. (1832) Subfam. Vaccinioideae Arn. <em>The Encyclopedia Britannica … Edinburgh ed.</em> 7. Vol. 5. pp. 118.</p>
<p>Bernhardi, J.J. (1805) Dritter Versuch einer Anordnung der Farrnkräuter. <em>Neues Journal für die Botanik</em> 1 (2): 1–50.</p>
<p>de Vriese, W.H. (1845) <em>Plantae novae et minus cognitae Indiae Batavae Orientalis</em>. Elix, Amsterdam, 12 pp. + 3 plates.</p>
<p>Helm, H.R. & Farbarik, J. (1998) JARS v52n3 - <em>A Rhododendron expedition to Sulawesi, Indonesia</em>. Available from: https://scholar.lib.vt.edu/ejournals/JARS/v52n3/v52n3-helm.htm (accessed 4 July 2020).</p>
<p>Hooker, J.D. (1873) <em>Icones plantarum</em>, Vol. 12. London, Williams and Norgate, 90 pp + 200 plates.</p>
<p>IUCN. (2012) <em>IUCN Red List categories and criteria:</em> <em>Version 3.1</em>. Second edition. IUCN, Gland and Cambridge, iv + 32 pp.</p>
<p>IUCN Standards and Petitions Subcommittee (2019) Guidelines for using the IUCN Red List Categories and Criteria. Version 14. Prepared by the Standards and Petitions Subcommittee, 113 pp. Available from: http://www.iucnredlist.org/documents/RedListGuidelines.pdf (accessed 3 July 2021).</p>
<p>Merril, E.D. (1923) New or noteworthy Bornean Plants. <em>Journal of the Malayan Branch of the Royal Asiatic Society</em> 1 (1): 22–45.</p>
<p>Linnaeus, C. (1753) <em>Species plantarum</em>. Laurentius Salvius, Stockholm, 1200 pp.</p>
<p>Reichenbach, H.G.L. (1831) Vaccinieae. <em>Flora germanica excursoria ex affinitate regni vegetabilis naturali disposita, sive principia synopseos plantarum in Germania terrisque in Europa media adjacentibus sponte nascentium cultarumque frequentius</em> 1 (3): 203–204. https://doi.org/10.5962/bhl.title.309</p>
<p>Shorthouse, D.P. (2010) SimpleMappr, an online tool to produce publication-quality point maps. Available from: http://www.simplemappr.net (accessed 22 December 2020).</p>
<p>Sleumer, H.O. (1936) Ericaceae novae vel minus cognitae III. <em>Notizblatt des Botanischen Gartens und Museums zu Berlin-Dahlem </em>13: 206–214. https://doi.org/10.2307/3994964</p>
<p>Sleumer, H.O. (1940) Neue Ericaceen aus Malesien. <em>Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie </em>71: 138–168</p>
<p>Sleumer, H.O. (1961) Florae Malesianae Precursores XXVIII. The genus <em>Vaccinium</em> in Malaysia. <em>Blumea</em> 11 (1): 1–112.</p>
<p>Sleumer, H.O. (1967) Ericaceae. <em>In</em>: van Steenis, C.G.G.J. (Ed.) <em>Flora Malesiana, Series 1</em>: <em>Spermatophyta (Seed Plants)</em>, Vol. 6. Wolters-Nordhoff, Groningen, pp. 699–914.</p>
<p>Smith, J.J. (1935) The Malaysian genus <em>Rigiolepis</em> Hooker f. <em>Blumea</em> 1 (2): 323–342.</p>
<p>Vander Kloet, S.P. (2005) The taxonomy of <em>Vaccinium</em> section <em>Rigiolepis</em> (Vaccinieae, Ericaceae). <em>Blumea</em> 50 (3): 477–497. https://doi.org/10.3767/000651905X622743</p>
<p>Arnott, G.A.W. (1832) Subfam. Vaccinioideae Arn. <em>The Encyclopedia Britannica … Edinburgh ed.</em> 7. Vol. 5. pp. 118.</p>
<p>Bernhardi, J.J. (1805) Dritter Versuch einer Anordnung der Farrnkräuter. <em>Neues Journal für die Botanik</em> 1 (2): 1–50.</p>
<p>de Vriese, W.H. (1845) <em>Plantae novae et minus cognitae Indiae Batavae Orientalis</em>. Elix, Amsterdam, 12 pp. + 3 plates.</p>
<p>Helm, H.R. & Farbarik, J. (1998) JARS v52n3 - <em>A Rhododendron expedition to Sulawesi, Indonesia</em>. Available from: https://scholar.lib.vt.edu/ejournals/JARS/v52n3/v52n3-helm.htm (accessed 4 July 2020).</p>
<p>Hooker, J.D. (1873) <em>Icones plantarum</em>, Vol. 12. London, Williams and Norgate, 90 pp + 200 plates.</p>
<p>IUCN. (2012) <em>IUCN Red List categories and criteria:</em> <em>Version 3.1</em>. Second edition. IUCN, Gland and Cambridge, iv + 32 pp.</p>
<p>IUCN Standards and Petitions Subcommittee (2019) Guidelines for using the IUCN Red List Categories and Criteria. Version 14. Prepared by the Standards and Petitions Subcommittee, 113 pp. Available from: http://www.iucnredlist.org/documents/RedListGuidelines.pdf (accessed 3 July 2021).</p>
<p>Merril, E.D. (1923) New or noteworthy Bornean Plants. <em>Journal of the Malayan Branch of the Royal Asiatic Society</em> 1 (1): 22–45.</p>
<p>Linnaeus, C. (1753) <em>Species plantarum</em>. Laurentius Salvius, Stockholm, 1200 pp.</p>
<p>Reichenbach, H.G.L. (1831) Vaccinieae. <em>Flora germanica excursoria ex affinitate regni vegetabilis naturali disposita, sive principia synopseos plantarum in Germania terrisque in Europa media adjacentibus sponte nascentium cultarumque frequentius</em> 1 (3): 203–204. https://doi.org/10.5962/bhl.title.309</p>
<p>Shorthouse, D.P. (2010) SimpleMappr, an online tool to produce publication-quality point maps. Available from: http://www.simplemappr.net (accessed 22 December 2020).</p>
<p>Sleumer, H.O. (1936) Ericaceae novae vel minus cognitae III. <em>Notizblatt des Botanischen Gartens und Museums zu Berlin-Dahlem </em>13: 206–214. https://doi.org/10.2307/3994964</p>
<p>Sleumer, H.O. (1940) Neue Ericaceen aus Malesien. <em>Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie </em>71: 138–168</p>
<p>Sleumer, H.O. (1961) Florae Malesianae Precursores XXVIII. The genus <em>Vaccinium</em> in Malaysia. <em>Blumea</em> 11 (1): 1–112.</p>
<p>Sleumer, H.O. (1967) Ericaceae. <em>In</em>: van Steenis, C.G.G.J. (Ed.) <em>Flora Malesiana, Series 1</em>: <em>Spermatophyta (Seed Plants)</em>, Vol. 6. Wolters-Nordhoff, Groningen, pp. 699–914.</p>
<p>Smith, J.J. (1935) The Malaysian genus <em>Rigiolepis</em> Hooker f. <em>Blumea</em> 1 (2): 323–342.</p>
<p>Vander Kloet, S.P. (2005) The taxonomy of <em>Vaccinium</em> section <em>Rigiolepis</em> (Vaccinieae, Ericaceae). <em>Blumea</em> 50 (3): 477–497. https://doi.org/10.3767/000651905X622743</p>