Skip to main content Skip to main navigation menu Skip to site footer
Published: 2022-01-21

Six new and a little-known species of Rudgea (Rubiaceae—Palicoureeae) from the Guianas

Meise Botanic Garden, Nieuwelaan 38, 1860 Meise, Belgium; Herbarium et Bibliothèque de Botanique africaine, C.P. 265, Université Libre de Bruxelles, Boulevard du Triomphe, 1050 Bruxelles, Belgium
Departamento de Ecologia e Biologia Evolutiva, Universidade Federal de São Paulo, campus Diadema, Rua São Nicolau, 210, 09913-030, Diadema, SP, Brazil
Programa de Pós-graduação em Botânica, Instituto de Ciências Biológicas, Universidade de Brasília, Caixa Postal 04457, Brasília, Distrito Federal, 70910-970, Brazil; Museu Paraense Emílio Goeldi, Coord. Botânica, Av. Perimetral 1901, 66077-830, Belém, PA, Brazil
French Guiana Guyana Suriname Brazil Psychotrieae Rubioideae new species Eudicots


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.


  1. Andersson, L. (2002) Relationships and generic circumscriptions in the Psychotria complex (Rubiaceae, Psychotrieae). Systematics and Geography of Plants 72: 167–202.

  2. Aublet, J.B.C.F. (1775) Histoire des plantes de la Guiane Françoise. Vol. 1. Didot jeune, Paris.

  3. 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.

  4. Bentham, G. (1841) Schomburgk’s Guiana Plants In: Hooker, W.J. (Ed.) Journal of Botany 3: 226–233.

  5. Bentham, G. (1850) Plantae Regnellianae (Continuatio) Rubiaceae. Linnaea 23: 455–466.

  6. 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.

  7. Bremekamp, C.E.B. (1934) Notes on the Rubiaceae of Surinam. Recueil des Travaux Botanique Néerlandais 31: 248–308.

  8. 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. []

  9. Candolle, A.P. de (1830) Rubiaceae. Prodromus systematis naturalis regni vegetabilis. Vol. 4. Treuttel & Würtz, Paris, pp. 341–622.

  10. Croat, T.B. (1995) Two new species of Araceae for the Guianas. Novon 5: 24–29.

  11. 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.

  12. IUCN (2012) IUCN Red List Categories and Criteria, version 3.1. Ed. 2. IUCN Species Survival Commission, Gland & Cambridge.

  13. 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. []

  14. Müller, J. (1876) Rubiaceae brasilienses novae. Flora 59: 547–554.

  15. Radford, A.E., Dickison, W.C., Massey, J.R. & Bell, C.R. (1974) Vascular Plant Systematics. Harper & Row Publishers, New York, 891 pp.

  16. Robbrecht, E. (1988) Tropical woody Rubiaceae. Opera Botanica Belgica 1: 1–271.

  17. 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.

  18. 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.

  19. Sandwith, N.Y. (1933) Contributions to the Flora of Tropical America: XVI. Bulletin of miscellaneous information, Kew 1933: 323–339.

  20. Schumann, K. (1891) Rubiaceae. In: Engler, A. & Prantl, K. (Eds.) Die natürlichen Pflanzenfamilien, vol. 4, part 4. W. Engelmann, Leipzig, pp. 1–156.

  21. Standley, P.C. (1936) Studies of American Plants VI. Publications of the Field Museum of Natural History, Botanical Series 11 (5): 145–276.

  22. 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.

  23. 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.

  24. Taylor, C.M. & Gereau, R.E. (2013) The genus Carapichea (Rubiaceae, Psychotrieae). Annals of the Missouri Botanical Garden 99 (1): 100–127.

  25. 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.

  26. 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.]

  27. 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.

  28. Thiers, B. (2022) Index Herbariorum: A global directory of public herbaria and associated staff. New York Botanical Garden’s Virtual Herbarium. Available from: (accessed 10 January 2022)

  29. Zappi, D. (2003) Revision of Rudgea (Rubiaceae) in Southeastern and Southern Brazil. Kew Bulletin 58: 513–596.

  30. 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.