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
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Taylor, C.M. & Hollowell, V. (2016) Rubiacearum Americanarum Magna Hama Pars XXXV: The New Group Palicourea sect. Nonatelia, with Five New Species (Palicoureeae). Novon 25: 69–110. https://doi.org/10.3417/2015012
Thiers, B. (2022) Index Herbariorum: A global directory of public herbaria and associated staff. New York Botanical Garden’s Virtual Herbarium. Available from: http://sweetgum.nybg.org/ih/ (accessed 10 January 2022)
Zappi, D. (2003) Revision of Rudgea (Rubiaceae) in Southeastern and Southern Brazil. Kew Bulletin 58: 513–596. https://doi.org/10.2307/4111145
Zappi, D. & Steyermark, J.A. (2004) Rudgea. In: Steyermark, J.A., Berry, P.E., Yatskievytch, K. & Holst, B.K. (Eds.) Flora of the Venezuelan Guayana, vol. 8, Poaceae – Rubiaceae. Missouri Botanical Garden Press, St. Louis, pp. 805–816.
Aublet, J.B.C.F. (1775) Histoire des plantes de la Guiane Françoise. Vol. 1. Didot jeune, Paris.
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. In: Smith, V. & Penev, L. (Eds.) e-Infrastructures for data publishing in biodiversity science. ZooKeys 150: 117–126. https://doi.org/10.3897/zookeys.150.2109
Bentham, G. (1841) Schomburgk’s Guiana Plants In: Hooker, W.J. (Ed.) Journal of Botany 3: 226–233.
Bentham, G. (1850) Plantae Regnellianae (Continuatio) Rubiaceae. Linnaea 23: 455–466.
Boom, B.M. & Delprete, P.G. (2002) Rubiaceae. In: 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. Memoirs of the New York Botanical Garden 76 (2): 606–647.
Bremekamp, C.E.B. (1934) Notes on the Rubiaceae of Surinam. Recueil des Travaux Botanique Néerlandais 31: 248–308.
Bruniera, C.P. (2015) Sistemática e taxonomia de Rudgea 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]
Candolle, A.P. de (1830) Rubiaceae. Prodromus systematis naturalis regni vegetabilis. Vol. 4. Treuttel & Würtz, Paris, pp. 341–622.
Croat, T.B. (1995) Two new species of Araceae for the Guianas. Novon 5: 24–29. https://doi.org/10.2307/3391825
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). Contributions of the United States National Herbarium 55: 1–584.
IUCN (2012) IUCN Red List Categories and Criteria, version 3.1. Ed. 2. IUCN Species Survival Commission, Gland & Cambridge.
IUCN [Standards and Petitions Subcommittee] (2019) Guidelines for Using the IUCN Red List Categories and Criteria. Version 14 (August 2019). Prepared by the Standards and Petitions Subcommittee. [http://www.iucnredlist.org/documents/RedListGuidelines.pdf]
Müller, J. (1876) Rubiaceae brasilienses novae. Flora 59: 547–554.
Radford, A.E., Dickison, W.C., Massey, J.R. & Bell, C.R. (1974) Vascular Plant Systematics. Harper & Row Publishers, New York, 891 pp.
Robbrecht, E. (1988) Tropical woody Rubiaceae. Opera Botanica Belgica 1: 1–271.
Robinson, B.L. (1910) XVII.II Spermatophytes, new or reclassified, chiefly Rubiaceae and Gentianaceae. Proceedings of the American Academy of Arts and Sciences 45: 394–412. https://doi.org/10.2307/20022574
Salisbury, R.A. (1807) Description of a new genus in the natural order of Rubiaceae, called Rudgea. Transactions of the Linnean Society of London 8: 325–329. https://doi.org/10.1111/j.1096-3642.1807.tb00320.x
Sandwith, N.Y. (1933) Contributions to the Flora of Tropical America: XVI. Bulletin of miscellaneous information, Kew 1933: 323–339. https://doi.org/10.2307/4113561
Schumann, K. (1891) Rubiaceae. In: Engler, A. & Prantl, K. (Eds.) Die natürlichen Pflanzenfamilien, vol. 4, part 4. W. Engelmann, Leipzig, pp. 1–156.
Standley, P.C. (1936) Studies of American Plants VI. Publications of the Field Museum of Natural History, Botanical Series 11 (5): 145–276. https://doi.org/10.5962/bhl.title.2345
Steyermark, J.A. (1967) Rubiaceae. In: Maguire, B. et al. (Eds.) The Botany of the Guayana Highland-Part VII. Memoirs of the New York Botanical Garden 17: 230–436.
Steyermark, J.A. (1972) Rubiaceae. In: Maguire, B. et al. (Eds.) The Botany of the Guayana Highland-Part IX. Memoirs of the New York Botanical Garden 23: 227–832.
Taylor, C.M. & Gereau, R.E. (2013) The genus Carapichea (Rubiaceae, Psychotrieae). Annals of the Missouri Botanical Garden 99 (1): 100–127. https://doi.org/10.3417/2011064
Taylor, C.M. (2015) Rubiacearum americanarum magna hama pars XXXIV: The new group Palicourea sect. Tricephalium with eight new species and a new subspecies (Palicoureeae). Novon 24: 55–95. https://doi.org/10.3417/2015001
Taylor, C.M., Bruniera, C.P. & Zappi, D.C. (2015) Taxonomic transfers in Neotropical Palicoureeae: new combinations in Rudgea and Palicourea. Kew Bulletin 70: 45. [7 pp.] https://doi.org/10.1007/s12225-015-9596-3
Taylor, C.M. & Hollowell, V. (2016) Rubiacearum Americanarum Magna Hama Pars XXXV: The New Group Palicourea sect. Nonatelia, with Five New Species (Palicoureeae). Novon 25: 69–110. https://doi.org/10.3417/2015012
Thiers, B. (2022) Index Herbariorum: A global directory of public herbaria and associated staff. New York Botanical Garden’s Virtual Herbarium. Available from: http://sweetgum.nybg.org/ih/ (accessed 10 January 2022)
Zappi, D. (2003) Revision of Rudgea (Rubiaceae) in Southeastern and Southern Brazil. Kew Bulletin 58: 513–596. https://doi.org/10.2307/4111145
Zappi, D. & Steyermark, J.A. (2004) Rudgea. In: Steyermark, J.A., Berry, P.E., Yatskievytch, K. & Holst, B.K. (Eds.) Flora of the Venezuelan Guayana, vol. 8, Poaceae – Rubiaceae. Missouri Botanical Garden Press, St. Louis, pp. 805–816.