Abstract
The Neotropical genus Rudgea (Rubiaceae) includes at least 120 species, 18 of which have previously been reported from the Guianas. While revising the material for the Flora of the Guianas, the authors uncovered and hereby describe six new species: R. approuaguensis, R. glomerulata, R. graniticola, R. itoupensis, R. jadinii and R. leucocarpa. Most of these are endemic to French Guiana, except R. graniticola which also occurs in Suriname, and R. leucocarpa, recorded also from Suriname and northern Brazil. Additionally, the original description of Rudgea ayangannensis, endemic of Guyana, is emended as it was based on a mixture of two different species, and adjustments are provided in a new description.
References
<p>Andersson, L. (2002) Relationships and generic circumscriptions in the Psychotria complex (Rubiaceae, Psychotrieae). <em>Systematics and Geography of Plants</em> 72: 167–202.</p>
<p>Aublet, J.B.C.F. (1775) <em>Histoire des plantes de la Guiane Françoise. Vol. 1.</em> Didot jeune, Paris.</p>
<p>Bachman, S., Moat, J., Hill, A.W., de la Torre, J. & Scott, B. (2011) Supporting Red List threat assessments with GeoCAT: geospatial conservation assessment tool. <em>In</em>: Smith, V. & Penev, L. (Eds.) e-Infrastructures for data publishing in biodiversity science. <em>ZooKeys</em> 150: 117–126. https://doi.org/10.3897/zookeys.150.2109</p>
<p>Bentham, G. (1841) Schomburgk’s Guiana Plants <em>In:</em> Hooker, W.J. (Ed.) <em>Journal of Botany</em> 3: 226–233.</p>
<p>Bentham, G. (1850) Plantae Regnellianae (Continuatio) Rubiaceae. <em>Linnaea</em> 23: 455–466.</p>
<p>Boom, B.M. & Delprete, P.G. (2002) Rubiaceae. <em>In</em>: Mori, S.A., Cremers, G., Gracie, C.A., Granville, J.-J. de, Heald, S.V., Hoff, M. & Mitchell, J.D. (Eds.) Guide to the Vascular Plants of Central French Guiana. Part 2. Dicotyledons. <em>Memoirs of the New York Botanical Garden</em> 76 (2): 606–647.</p>
<p>Bremekamp, C.E.B. (1934) Notes on the Rubiaceae of Surinam. <em>Recueil des Travaux Botanique Néerlandais </em>31: 248–308.</p>
<p>Bruniera, C.P. (2015) Sistemática e taxonomia de <em>Rudgea</em> Salisb. (Palicoureeae, Rubiaceae) Unpublished Doctoral Thesis, Instituto de Biociências, Universidade de São Paulo, São Paulo, 283 pp. [http://www.teses.usp.br/teses/disponiveis/41/41132/tde-28072015-145432/en.php]</p>
<p>Candolle, A.P. de (1830) Rubiaceae. <em>Prodromus systematis naturalis regni vegetabilis</em>. Vol. 4. Treuttel & Würtz, Paris, pp. 341–622.</p>
<p>Croat, T.B. (1995) Two new species of Araceae for the Guianas. <em>Novon</em> 5: 24–29. https://doi.org/10.2307/3391825</p>
<p>Funk, V.A., Berry, P.E., Alexander, S., Hollowell, T.H. & Kelloff, C.L. (2007) Checklist of the Plants of the Guiana Shield (Venezuela: Amazonas, Bolivar, Delta Amacuro; Guyana, Surinam, French Guiana). <em>Contributions of the United States National Herbarium</em> 55: 1–584.</p>
<p>IUCN (2012) IUCN Red List Categories and Criteria, version 3.1. Ed. 2. IUCN Species Survival Commission, Gland & Cambridge.</p>
<p>IUCN [Standards and Petitions Subcommittee] (2019) <em>Guidelines for Using the IUCN Red List Categories and Criteria.</em> Version 14 (August 2019). Prepared by the Standards and Petitions Subcommittee. [http://www.iucnredlist.org/documents/RedListGuidelines.pdf]</p>
<p>Müller, J. (1876) Rubiaceae brasilienses novae. <em>Flora</em> 59: 547–554.</p>
<p>Radford, A.E., Dickison, W.C., Massey, J.R. & Bell, C.R. (1974) <em>Vascular Plant Systematics.</em> Harper & Row Publishers, New York, 891 pp.</p>
<p>Robbrecht, E. (1988) Tropical woody Rubiaceae. <em>Opera Botanica Belgica</em> 1: 1–271.</p>
<p>Robinson, B.L. (1910) XVII.II Spermatophytes, new or reclassified, chiefly Rubiaceae and Gentianaceae. <em>Proceedings of the American Academy of Arts and Sciences </em>45: 394–412. https://doi.org/10.2307/20022574</p>
<p>Salisbury, R.A. (1807) Description of a new genus in the natural order of Rubiaceae, called <em>Rudgea</em>. <em>Transactions of the Linnean Society of London</em> 8: 325–329. https://doi.org/10.1111/j.1096-3642.1807.tb00320.x</p>
<p>Sandwith, N.Y. (1933) Contributions to the Flora of Tropical America: XVI. <em>Bulletin of miscellaneous information, Kew </em>1933: 323–339. https://doi.org/10.2307/4113561</p>
<p>Schumann, K. (1891) Rubiaceae. <em>In:</em> Engler, A. & Prantl, K. (Eds.) <em>Die natürlichen Pflanzenfamilien,</em> vol. 4, part 4. W. Engelmann, Leipzig, pp. 1–156.</p>
<p>Standley, P.C. (1936) Studies of American Plants VI. <em>Publications of the Field Museum of Natural History, Botanical Series</em> 11 (5): 145–276. https://doi.org/10.5962/bhl.title.2345</p>
<p>Steyermark, J.A. (1967) Rubiaceae. <em>In:</em> Maguire, B. <em>et al.</em> (Eds.) The Botany of the Guayana Highland-Part VII. <em>Memoirs of the New York Botanical Garden</em> 17: 230–436.</p>
<p>Steyermark, J.A. (1972) Rubiaceae. <em>In:</em> Maguire, B. <em>et al.</em> (Eds.) The Botany of the Guayana Highland-Part IX. <em>Memoirs of the New York Botanical Garden</em> 23: 227–832.</p>
<p>Taylor, C.M. & Gereau, R.E. (2013) The genus <em>Carapichea</em> (Rubiaceae, Psychotrieae). <em>Annals of the Missouri Botanical Garden</em> 99 (1): 100–127. https://doi.org/10.3417/2011064</p>
<p>Taylor, C.M. (2015) Rubiacearum americanarum magna hama pars XXXIV: The new group <em>Palicourea</em> sect. <em>Tricephalium</em> with eight new species and a new subspecies (Palicoureeae). <em>Novon</em> 24: 55–95. https://doi.org/10.3417/2015001</p>
<p>Taylor, C.M., Bruniera, C.P. & Zappi, D.C. (2015) Taxonomic transfers in Neotropical Palicoureeae: new combinations in <em>Rudgea</em> and <em>Palicourea</em>. <em>Kew Bulletin</em> 70: 45. [7 pp.] https://doi.org/10.1007/s12225-015-9596-3</p>
<p>Taylor, C.M. & Hollowell, V. (2016) Rubiacearum Americanarum Magna Hama Pars XXXV: The New Group <em>Palicourea</em> sect. <em>Nonatelia</em>, with Five New Species (Palicoureeae). <em>Novon</em> 25: 69–110. https://doi.org/10.3417/2015012</p>
<p>Thiers, B. (2022) <em>Index Herbariorum: A global directory of public herbaria and associated staff. New York Botanical Garden’s Virtual Herbarium.</em> Available from: http://sweetgum.nybg.org/ih/ (accessed 10 January 2022)</p>
<p>Zappi, D. (2003) Revision of <em>Rudgea</em> (Rubiaceae) in Southeastern and Southern Brazil. <em>Kew Bulletin </em>58: 513–596. https://doi.org/10.2307/4111145</p>
<p>Zappi, D. & Steyermark, J.A. (2004) <em>Rudgea</em>. <em>In</em>: Steyermark, J.A., Berry, P.E., Yatskievytch, K. & Holst, B.K. (Eds.) <em>Flora of the Venezuelan Guayana, </em>vol. 8,<em> Poaceae – Rubiaceae</em>. Missouri Botanical Garden Press, St. Louis, pp. 805–816.</p>
<p>Aublet, J.B.C.F. (1775) <em>Histoire des plantes de la Guiane Françoise. Vol. 1.</em> Didot jeune, Paris.</p>
<p>Bachman, S., Moat, J., Hill, A.W., de la Torre, J. & Scott, B. (2011) Supporting Red List threat assessments with GeoCAT: geospatial conservation assessment tool. <em>In</em>: Smith, V. & Penev, L. (Eds.) e-Infrastructures for data publishing in biodiversity science. <em>ZooKeys</em> 150: 117–126. https://doi.org/10.3897/zookeys.150.2109</p>
<p>Bentham, G. (1841) Schomburgk’s Guiana Plants <em>In:</em> Hooker, W.J. (Ed.) <em>Journal of Botany</em> 3: 226–233.</p>
<p>Bentham, G. (1850) Plantae Regnellianae (Continuatio) Rubiaceae. <em>Linnaea</em> 23: 455–466.</p>
<p>Boom, B.M. & Delprete, P.G. (2002) Rubiaceae. <em>In</em>: Mori, S.A., Cremers, G., Gracie, C.A., Granville, J.-J. de, Heald, S.V., Hoff, M. & Mitchell, J.D. (Eds.) Guide to the Vascular Plants of Central French Guiana. Part 2. Dicotyledons. <em>Memoirs of the New York Botanical Garden</em> 76 (2): 606–647.</p>
<p>Bremekamp, C.E.B. (1934) Notes on the Rubiaceae of Surinam. <em>Recueil des Travaux Botanique Néerlandais </em>31: 248–308.</p>
<p>Bruniera, C.P. (2015) Sistemática e taxonomia de <em>Rudgea</em> Salisb. (Palicoureeae, Rubiaceae) Unpublished Doctoral Thesis, Instituto de Biociências, Universidade de São Paulo, São Paulo, 283 pp. [http://www.teses.usp.br/teses/disponiveis/41/41132/tde-28072015-145432/en.php]</p>
<p>Candolle, A.P. de (1830) Rubiaceae. <em>Prodromus systematis naturalis regni vegetabilis</em>. Vol. 4. Treuttel & Würtz, Paris, pp. 341–622.</p>
<p>Croat, T.B. (1995) Two new species of Araceae for the Guianas. <em>Novon</em> 5: 24–29. https://doi.org/10.2307/3391825</p>
<p>Funk, V.A., Berry, P.E., Alexander, S., Hollowell, T.H. & Kelloff, C.L. (2007) Checklist of the Plants of the Guiana Shield (Venezuela: Amazonas, Bolivar, Delta Amacuro; Guyana, Surinam, French Guiana). <em>Contributions of the United States National Herbarium</em> 55: 1–584.</p>
<p>IUCN (2012) IUCN Red List Categories and Criteria, version 3.1. Ed. 2. IUCN Species Survival Commission, Gland & Cambridge.</p>
<p>IUCN [Standards and Petitions Subcommittee] (2019) <em>Guidelines for Using the IUCN Red List Categories and Criteria.</em> Version 14 (August 2019). Prepared by the Standards and Petitions Subcommittee. [http://www.iucnredlist.org/documents/RedListGuidelines.pdf]</p>
<p>Müller, J. (1876) Rubiaceae brasilienses novae. <em>Flora</em> 59: 547–554.</p>
<p>Radford, A.E., Dickison, W.C., Massey, J.R. & Bell, C.R. (1974) <em>Vascular Plant Systematics.</em> Harper & Row Publishers, New York, 891 pp.</p>
<p>Robbrecht, E. (1988) Tropical woody Rubiaceae. <em>Opera Botanica Belgica</em> 1: 1–271.</p>
<p>Robinson, B.L. (1910) XVII.II Spermatophytes, new or reclassified, chiefly Rubiaceae and Gentianaceae. <em>Proceedings of the American Academy of Arts and Sciences </em>45: 394–412. https://doi.org/10.2307/20022574</p>
<p>Salisbury, R.A. (1807) Description of a new genus in the natural order of Rubiaceae, called <em>Rudgea</em>. <em>Transactions of the Linnean Society of London</em> 8: 325–329. https://doi.org/10.1111/j.1096-3642.1807.tb00320.x</p>
<p>Sandwith, N.Y. (1933) Contributions to the Flora of Tropical America: XVI. <em>Bulletin of miscellaneous information, Kew </em>1933: 323–339. https://doi.org/10.2307/4113561</p>
<p>Schumann, K. (1891) Rubiaceae. <em>In:</em> Engler, A. & Prantl, K. (Eds.) <em>Die natürlichen Pflanzenfamilien,</em> vol. 4, part 4. W. Engelmann, Leipzig, pp. 1–156.</p>
<p>Standley, P.C. (1936) Studies of American Plants VI. <em>Publications of the Field Museum of Natural History, Botanical Series</em> 11 (5): 145–276. https://doi.org/10.5962/bhl.title.2345</p>
<p>Steyermark, J.A. (1967) Rubiaceae. <em>In:</em> Maguire, B. <em>et al.</em> (Eds.) The Botany of the Guayana Highland-Part VII. <em>Memoirs of the New York Botanical Garden</em> 17: 230–436.</p>
<p>Steyermark, J.A. (1972) Rubiaceae. <em>In:</em> Maguire, B. <em>et al.</em> (Eds.) The Botany of the Guayana Highland-Part IX. <em>Memoirs of the New York Botanical Garden</em> 23: 227–832.</p>
<p>Taylor, C.M. & Gereau, R.E. (2013) The genus <em>Carapichea</em> (Rubiaceae, Psychotrieae). <em>Annals of the Missouri Botanical Garden</em> 99 (1): 100–127. https://doi.org/10.3417/2011064</p>
<p>Taylor, C.M. (2015) Rubiacearum americanarum magna hama pars XXXIV: The new group <em>Palicourea</em> sect. <em>Tricephalium</em> with eight new species and a new subspecies (Palicoureeae). <em>Novon</em> 24: 55–95. https://doi.org/10.3417/2015001</p>
<p>Taylor, C.M., Bruniera, C.P. & Zappi, D.C. (2015) Taxonomic transfers in Neotropical Palicoureeae: new combinations in <em>Rudgea</em> and <em>Palicourea</em>. <em>Kew Bulletin</em> 70: 45. [7 pp.] https://doi.org/10.1007/s12225-015-9596-3</p>
<p>Taylor, C.M. & Hollowell, V. (2016) Rubiacearum Americanarum Magna Hama Pars XXXV: The New Group <em>Palicourea</em> sect. <em>Nonatelia</em>, with Five New Species (Palicoureeae). <em>Novon</em> 25: 69–110. https://doi.org/10.3417/2015012</p>
<p>Thiers, B. (2022) <em>Index Herbariorum: A global directory of public herbaria and associated staff. New York Botanical Garden’s Virtual Herbarium.</em> Available from: http://sweetgum.nybg.org/ih/ (accessed 10 January 2022)</p>
<p>Zappi, D. (2003) Revision of <em>Rudgea</em> (Rubiaceae) in Southeastern and Southern Brazil. <em>Kew Bulletin </em>58: 513–596. https://doi.org/10.2307/4111145</p>
<p>Zappi, D. & Steyermark, J.A. (2004) <em>Rudgea</em>. <em>In</em>: Steyermark, J.A., Berry, P.E., Yatskievytch, K. & Holst, B.K. (Eds.) <em>Flora of the Venezuelan Guayana, </em>vol. 8,<em> Poaceae – Rubiaceae</em>. Missouri Botanical Garden Press, St. Louis, pp. 805–816.</p>