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Published: 2022-03-08

Dichorisandra rhizantha (Commelinaceae), a new morphologically unusual species from Bahia, Brazil

Universidade Federal do Recôncavo da Bahia (UFRB), Cruz das Almas, Bahia, Brazil
Universidade Federal do Recôncavo da Bahia (UFRB), Cruz das Almas, Bahia, Brazil
Universidade Federal do Recôncavo da Bahia (UFRB), Cruz das Almas, Bahia, Brazil
Universidade Federal do Maranhão (UFMA), Centro de Ciências Biológicas e da Saúde, Departamento de Biologia, São Luís, Maranhão, Brazil
Rua Dr. Mario de Nucci 500, Campinas, SP, Brazil.
Universidade Estadual de Campinas (UNICAMP), Instituto de Biologia, Departamento de Biologia Vegetal, Campinas, SP, Brazil
Commelinales Dichorisandra hirtella endemism flora of Bahia Monocots


We describe, discuss, and illustrate Dichorisandra rhizantha, a new species from a transitional area between the Atlantic Forest and Caatinga domains in eastern Bahia state, Brazil. The species was assessed as Endangered, especially for its distribution restricted to forest fragments. The new species is morphologically similar to D. hirtella, D. radicalis and D. jardimii, but clearly differs from these by the inflorescence arising directly from the rhizome, and a pubescent indument on stem, leaves and sepals. We also present a distribution map of the species and taxonomic comments.


  1. Almeida Junior, R.A. (2020) Fenologia e biologia floral e reprodutiva de uma espécie de Dichorisandra (Commelinaceae) em um fragmento de mata atlântica em Cruz das Almas, Bahia, Brasil. Ph.D. dissertation. Universidade Federal do Recôncavo da Bahia, Cruz das Almas, Brazil, 52 pp.

  2. Aona, L.Y.S. (2008) Revisão taxonômica e análise cladística do gênero Dichorisandra J.C.Mikan (Commelinaceae). Ph.D. dissertation. Universidade Estadual de Campinas, Campinas, Brazil, 310 pp.

  3. Aona, L.Y.S., Faden, R.B. & Amaral, M.C.E. (2012) Five new species of Dichorisandra J.C.Mikan (Commelinaceae). Kew Bulletin 66: 1–13.

  4. Aona-Pinheiro, L.Y.S. & Amaral, M.C.E. (2012) Four new species of Dichorisandra J.C. Mikan (Commelinaceae) from Southeast Brazil. Phytotaxa 48: 7–22.

  5. Aona, L.Y.S. & Amaral, M.C.E. (2017) Endemism and the importance of intensive collections efforts for a taxonomic revision of Dichorisandra J.C. Mikan, Commelinaceae (Commelinales). In: The Fifth International Conference on the Comparative Biology of Monocotyledons, New York. New York: NYBG Press, pp. 147–156.

  6. Aona, L.Y.S. & Amaral, M.C.E. (2020) Dichorisandra in Flora do Brasil 2020. Jardim Botânico do Rio de Janeiro. Available from: (accessed 25 february 2021)

  7. Aona, L.Y.S.; Amaral, M.C.E & V. Bittrich. (2018) Taxonomic and nomenclatural notes on Brazilian Dichorisandra (Commelinaceae). Phytotaxa 348: 1–13.

  8. Azevedo, C.O., Marinho, L.C., Machado, A.F.P., Arroyo, F. & Vázquez-García, J. (2018) Magnolia brasiliensis (Magnoliaceae), a new species and new record for the Northeastern region of Brazil. Brittonia 70: 306–311.

  9. Bachman, S., Moat, J., Hill, A.W., 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.

  10. Faden, R.B. & Hunt, D.R. (1991) The classification of the Commelinaceae. Taxon 40: 19–31.

  11. Giulietti, A.M., Queiroz, L.P., Silva, T.R.S., França, F. Guedes, M.L. & Amorim, A.M. (2006) Flora da Bahia. Sitientibus Série Ciências Biológicas 6: 169–173.

  12. Goldenberg, R., Jesus, J.C. & Amorim, A.M. (2020) Miconia bahiana (Melastomataceae, Miconieae), a new species from semideciduous forest in Bahia, Brazil. Plant Ecology and Evolution 153: 152–159.

  13. Hickey, M. & King, C. (2004) The Cambridge illustrated glossary of botanical terms. Cambridge University Press, Cambridge, 208 pp.

  14. IUCN (2012) IUCN Red List Categories and Criteria: Version 3.1. Second edition. Gland, Switzerland and Cambridge, UK: IUCN. iv + 32pp. Available from: (accessed 1 November 2020).

  15. IUCN (2019) Standards and Petitions Committee. 2019. Guidelines for Using the IUCN Red List Categories and Criteria. Version 14. Prepared by the Standards and Petitions Committee. Available from: (accessed 16 October 2021).

  16. Leme, E.M.C., Till, W., Kollmann, L.J.C., Moura, R.L. & Ribeiro, O.B.C. (2014) Miscellaneous New Species of Brazilian Bromeliaceae – III. Phytotaxa 177: 61–100.

  17. Mikan, J.C. (1820) Delectus Florae et Faunae Brasiliensis 1: 1–3.

  18. Moraes, P.R.L. (2011) Notes and lectotypification of names based on Brazilian collections of Prince Maximilian of Wied. Kew Bulletin 66: 493–503.

  19. Nees von Esenbeck, C.G.D. & von Martius, C.F.P. (1823) In: Nova Acta Physico-medica Academiae Caesareae Leopoldino-Carolinae Naturae Curiosorum Exhibentia Ephemerides sive Observationes Historias et Experimenta 11: 1–88.

  20. Radford, A.E., Dickson, W.C., Massey, J.R. & Bell, C.R. (1974) Vascular plants systematics. Harper & Ro., New York, 891 pp.

  21. Schultes, J.A. & Schultes, J.H. (1830) Commelinaceae. In: Systema vegetabilium: secundum classes, ordines, genera, species, cum characteribus, diferentiis et synonymus. Sumtibus J.G. Cottae, Stuttgardtiae, 1817–1830. 1186 pp.

  22. Seubert, M.A. (1855) Commelinaceae. In: Martius, C.F.P. (Ed.) Flora brasiliensis 3: 233–270.

  23. Shorthouse, D.P. (2010) SimpleMappr, an online tool to produce publication-quality point maps. Available from: (accessed 13 February 2021)

  24. Thiers, B.M. (2022 [Continuously updated]) Index Herbariorum. New York Botanical Garden’s Virtual Herbarium. Available from: (accessed 20 February 2020)