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Type: Article
Published: 2023-07-28
Page range: 147-154
Abstract views: 150
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A new species of Oxalis sect. Thamnoxys (Oxalidaceae) from the state of Bahia, Brazil

Departamento de Botânica; Centro de Ciências Biológicas; Universidade Federal de Santa Catarina; Campus Trindade; 88040-900; Florianópolis; Santa Catarina; Brasil
Programa de Pós-Graduação em Biologia de Fungos; Algas e Plantas; Centro de Ciências Biológicas; Universidade Federal de Santa Catarina; Campus Trindade; 88040-900; Florianópolis; Santa Catarina; Brasil
Programa de Pós-Graduação em Biologia de Fungos; Algas e Plantas; Centro de Ciências Biológicas; Universidade Federal de Santa Catarina; Campus Trindade; 88040-900; Florianópolis; Santa Catarina; Brasil
Eudicots conservation endemism geographic distribution taxonomy


Oxalis jacobinensis, a new species of Oxalis sect. Thamnoxys, is described from the State of Bahia, in the northern sector of the Chapada Diamantina mountains. It can be distinguished from other species of the section by the leaves usually grouped at the stem apex, terminal leaflet blades rhombic-ovate to lanceolate, usually appearing grayish when fresh on the abaxial side, pedicels articulated at ca. 1/3 of their length, usually leaving a conspicuous foot, and capsules with two-seeded carpels narrowing distally, and abaxially covered with short stalked glandular hairs. We provide a description, illustrations, a geographic distribution map, a preliminary evaluation of its conservation status, and taxonomic notes.


  1. Abreu, M.C., Silva, M.J. & Sales, M.F. (2012) Análise cladística de Oxalis sect. Thamnoxys (Oxalidaceae) baseada em dados morfológicos. Rodriguésia 63: 755–761.
  2. Almeida, E.D.S., Filho, J.A.S. & Leme, E.M.C. (2022) Cryptanthus euglossinii (Bromeliaceae: Bromelioideae), a new species from Chapada Diamantina, Bahia. Rodriguésia 73: e02092020.
  3. Antonelli, A., Smith, R.J., Perrigo, A.L., Crottini, A., Hackel, J., Testo, W., Farooq, H., Jiménez, M.F.T., Andela, N., Andermann, T., Andriamanohera, A.M., Andriambololonera, S., Bachman, S.P., Bacon, C.D., Baker, W.J., Belluardo, F., Birkinshaw, C., Borrell, J.S., Cable, S., Canales, N.A., Carrillo, J.D., Clegg, R., Clubbe, C., Cooke, R.S.C., Damasco, G., Dhanda, S., Edler, D., Faurby, S., Ferreira, P.L., Fisher, B.L., Forest, F., Gardiner, L.M., Goodman, S.M., Grace, O.M., Guedes, T.B., Henniges, M.C., Hill, R., Lehmann, C.E.R., Lowry II, P.P., Marline, L., Matos-Maraví, P., Moat, J., Neves, B., Nogueira, M.G.C., Onstein, R.E., Papadopulos, A.S.T., Perez-Escobar, O.A., Phelps, L.N., Phillipson, P.B., Pironon, S., Przelomska, N.A.S., Rabarimanarivo, M., Rabehevitra, D., Raharimampionona, J., Rajaonah, M.T., Rajaonary, F., Rajaovelona, L.R., Rakotoarinivo, M., Rakotoarisoa, A.A., Rakotoarisoa, S.E., Rakotomalala, H.N., Rakotonasolo, F., Ralaiveloarisoa, B.A., Ramirez-Herranz, M., Randriamamonjy, J.E.N., Randriamboavonjy, T., Randrianasolo, V., Rasolohery, A., Ratsifandrihamanana, A.N., Ravololomanana, N., Razafiniary, V., Razanajatovo, H., Razanatsoa, E., Rivers, M., Sayol, F., Silvestro, D., Vorontsova, M.S., Walker, K., Walker, B.E., Wilkin, P., Williams, J., Ziegler, T., Zizka, A. & Ralimanana, H. (2022) Madagascar’s extraordinary biodiversity: evolution, distribution, and use. Science 378: eabf0869.
  4. Araújo, J.G, Santos, M.R.C., Oliveira, T.C. & Souza, T.P.P. (2013) Análise do potencial turístico do distrito de Itaitu (Jacobina-BA) e seus reflexos para o desenvolvimento local. DRd – Desenvolvimento Regional em debate 3: 196–215.
  5. Bachman, S., Moat, J., Hill, A.W., Torre, J. & Scott, B. (2011) Supporting Red List threat assessments with GeoCAT: geospatial conservation assessment tool. E-Infrastructures for data publishing in biodiversity science. ZooKeys 150: 117–126.
  6. Beentje, H. (2014) The Kew Plant Glossary: an Illustrated Dictionary of Plant Terms. Royal Botanic Gardens, Kew, 171 pp.
  7. BFG (2018) Brazilian Flora 2020: Innovation and collaboration to meet Target 1 of the Global Strategy for Plant Conservation (GSPC). Rodriguésia 69: 1513–1527.
  8. Cabral, F.S., Lima, D.F., Vaio, M. & Fiaschi, P. (in press) Molecular phylogenetics of Oxalis subg. Thamnoxys (Oxalidaceae) reveals artificial arrangements of traditional sections. Botanical Journal of the Linnean Society.
  9. Cámara-Leret, R., Frodin, D.G., Adema, F., Anderson, C., Appelhans, M.S., Argent, G., Guerrero, S.A., Ashton, P., Baker, W.J., Barfod, A.S., Barrington, D., Borosova, R., Bramley, G.L.C., Briggs, M., Buerki, S., Cahen, D., Callmander, M.W., Cheek, M., Cheng-Wei, C., Conn, B.J., Coode, M.J.E., Darbyshire, I., Dawson, S., Dransfield, J., Drinkell, C., Duyfjes, B., Ebihara, A., Ezedin, Z., Long-Fei, Fu, Gideon, O., Girmansyah, D., Govaerts, R., Fortune-Hopkins, H., Hassemer, G., Hay, A., Heatubun, C.D., Hind, D.J.N., Hoch, P., Homot, P., Hovenkamp, P., Hughes, M., Jebb, M., Jennings, L., Jimbo, T., Kessler, M., Kiew, R., Knapp, S., Lamei, P., Lehnert, M., Lewis, G.P., Linder, H.P., Lindsay, S., Low, Y.W., Lucas, E., Mancera, J.P., Monro, A.K., Moore, A., Middleton, D.J., Nagamasu, H., Newman, M.F., Nic-Lughadha, E. Melo, P.H.A., Ohlsen, D.J., Pannell, C.M., Parris, B., Pearce, L., Penneys, D.S., Perrie, L.R., Petoe, P., Poulsen, A.D., Prance, G.T., Quakenbush, J.P., Raes, N., Rodda, M., Rogers, Z.S., Schuiteman, A., Schwartsburd, P., Scotland, R.W., Simmons, M.P., Simpson, D.A., Stevens, P., Sundue, M., Testo, W., Trias-Blasi, A., Turner, A., Utteridge, T., Walsingham, L., Webber, B.L., Wei, R., Weiblen, G.D., Weigend, M., Weston, P., de Wilde, E., Wilkie, P., Wilmot-Dear, C.M., Wilson, H.P., Wood, J.R.I., Zhang, L.-B. & van Welzen, P.C. (2020) New Guinea has the world’s richest island flora. Nature 584: 579–583.
  10. Christenhusz, M.J.M., Fay, M.F. & Chase, M.W. (2017) Plants of the World: an Illustrated Encyclopaedia of Vascular Plants. Royal Botanic Gardens, Kew, 792 pp.
  11. Colli-Silva, M., Vasconcelos, T.N.C. & Pirani, J.R. (2019) Outstanding plant endemism levels strongly support the recognition of campo rupestre provinces in mountaintops of eastern South America. Journal of Biogeography 46: 1723–733.
  12. Eiten, G. (1963) Taxonomy and Regional Variation of Oxalis section Corniculatae. I. Introduction, Keys and Synopsis of the Species. The American Midland Naturalist 69: 257–309.
  13. Ellis, B., Day, D.C., Hickey, L.J., Johnson, K.R., Mitchell, J.D., Wilf, P. & Wing, S.L. (2009) Manual of Leaf Architecture. Cornell University Press, Ithaca, 190 pp.
  14. Endlicher, S. (1840) Genera plantarum secundum ordines naturales disposita. Fr. Beck Universitatis Bibliopolam, Vienna, 1483 pp.
  15. Espírito Santo, F.S., Silva-Castro, M.M. & Rapini, A. (2012) Two new species of Handroanthus Mattos (Bignoniaceae) from the state of Bahia, Brazil. Acta Botanica Brasilica 26: 651–657.
  16. Fiaschi, P. (2012) Two new species of Oxalis sect. Polymorphae (Oxalidaceae) from the Brazilian Atlantic Forest. Kew Bulletin 67: 33–38.
  17. Fiaschi, P. (2014) Three new species and a revised key to species of Oxalis section Polymorphae (Oxalidaceae). Brittonia 66: 134–150.
  18. Fiaschi, P., Costa-Lima, J.L., de Abreu, M.C. & Costa, T.S. (2023) Oxalis. In: Jardim Botânico do Rio de Janeiro, Rio de Janeiro, Brasil (Ed.) Flora e Funga do Brasil. Available from: (accessed: 15 July 2023).
  19. Figueiredo, M.S.L., Weber, M.M., Brasileiro, C.A., Cerqueira, R., Grelle, C.E.V., Jenkins, C.N., Solidade, C.V., Thomé, M.T.C., Vale, M.M. & Lorini, M.L. (2021) Tetrapod Diversity in the Atlantic Forest: Maps and Gaps. In: Marques, M.C.M. & Grelle, C.E.V. (Eds.) The Atlantic Forest: History, Biodiversity, Threats and Opportunities of the Mega-diverse Forest. Springer, Cham, pp. 185–204.
  20. Funch, L.S., Rodal, M.J.N. & Funch, R.R. (2008) Floristic aspects of forests of the Chapada Diamantina, Bahia, Brazil. In: Thomas, W.W. (Ed.) The Atlantic Coastal Forest of Northeastern Brazil. Memoirs of the New York Botanical Garden, Vol. 100. The New York Botanical Garden Press, Bronx, pp. 193–220.
  21. Giulietti, A.M., Pirani, J.R. & Harley, R.M. (1997) Espinhaço Range region. In: Davis, S.D., Heywood, V.H., Macbryde, O.H., Villa‐Lobos, J. & Hamilton, A.C. (Eds.) Centers of Plant Diversity: A Guide and Strategy for their Conservation, vol. 3. IUCN, Cambridge, pp. 397–404.
  22. Grigoletto, D., Bertuzzi, T., Eisinger, S.M., Canto-Dorow, T.S. & Colusso, C.S. (2014) O gênero Oxalis L. (Oxalidaceae) no Rio Grande do Sul, Brasil. Ciência e Natura 36: 594–612.
  23. Huber, B.A. (2016) Spider diversity and endemism in a South American hotspot: 20 new species of Carapoia (Araneae: Pholcidae) from Brazil’s Atlantic Forest. Zootaxa 4177: 1–69.
  24. IUCN (2012) The IUCN Red List Categories and Criteria, version 3.1, Second Edition. IUCN Red List Unit, Cambridge (U.K.). Available from: (accessed: 15 July 2023).
  25. Laurance, W.F. (2009) Conserving the hottest of the hotspots. Biodiversity & Conservation 142 (6): 1137.
  26. Linnaeus, C. (1753) Species plantarum: exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas, Vol. 1. Impensis Laurentii Salvii, Holmiae, 560 pp.
  27. Lourteig, A. (1978) “Fire-fern”, Oxalis alstonii Lourt. n. sp. Bradea 2: 291–294.
  28. Lourteig, A. (1980) Oxalidaceae extra-austroamericanae. III. Oxalis L. subgenus Monoxalis (Small) Lourt. stat. nov. Phytologia 46: 456–459.
  29. Lourteig, A. (1994) Oxalis L. Subgénero Thamnoxys (Endl.) Reiche emend. Lourt. Bradea 7: 1–199.
  30. Lourteig, A. (1995) Oxalis Subgenus Trifidus Lourt. n. subgen. Bradea 6: 389–395.
  31. Lourteig, A. (2000) Oxalis L. subgenera Monoxalis (Small) Lourteig, Oxalis and Trifidus Lourteig. Bradea 7: 201–629.
  32. Mace, G.M. (2004) The role of taxonomy in species conservation. Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences 359: 711–719.
  33. Mittermeier, R.A., Turner, W.R., Larsen, F.W., Brooks, T.M. & Gascon, C. (2011) Global Biodiversity Conservation: The Critical Role of Hotspots. In: Zachos, F.E. & Habel, J.C. (Eds.) Biodiversity Hotspots: Distribution and Protection of Conservation Priority Areas. Springer-Verlag, Berlin, pp. 3–22.
  34. Neto, L.M., Furtado, S.G., Zappi, D.C., Filho, A.T.O. & Forzza, R.T. (2016) Biogeography of epiphytic Angiosperms in the Brazilian Atlantic forest, a world biodiversity hotspot. Brazilian Journal of Botany 39: 261–273.
  35. Nuernberg-Silva, A. & Fiaschi, P. (2021) Taxonomic revision and morphological delimitation of Oxalis sect. Ripariae (Oxalidaceae). Phytotaxa 529: 125–159.
  36. Ostroski, P., Saiter, F.Z., Amorim, A.M. & Fiaschi, P. (2020) Angiosperm endemism in a Brazilian Atlantic Forest biodiversity hopoint. Brazilian Journal of Botany 43: 397–404.
  37. Pontes, T.A., Andrade, I.M., Richards, R.S., Haigh, A., van den Berg, C. & Mayo, S.J. (2019) Anthurium harleyi (Araceae)—a new rupicolous species of section Urospadix from the northern Chapada Diamantina, Bahia, Brazil. Kew Bulletin 74: 11.
  38. Progel, A. (1877) Oxalideae. In: Martius, C.F.P. & Eichler, A.G. (Eds.) Flora brasiliensis, vol. 12 (2). Frid. Fleischer, Lipsiae, 474–520, plates 102–116.
  39. QGIS. (2018) Available from: (accessed April 2018)
  40. Radford, A.E., Dickson, W.C., Massey, J.R. & Bell, C.A.R. (1974) Vascular Plant Systematics. New York, Harper & Row, 891 pp.
  41. Reiche, K. (1894) Zur Kenntnis der chilenischen Arten der Gattung Oxalis. Botanische Jahrbücher fur Systematik, Pflanzengeschichte und Pflanzengeographie 18: 259–305.
  42. Richetti, E., Costa, T.S., Cabral, W.S., Fiaschi, P., Sakuragui, C.M. & Lusa, M.G. (2022) Morphoanatomy and phylogenetics reveals a distinct species of Oxalis sect. Polymorphae (Oxalidaceae) from the Brazilian Atlantic forest. Plant Systematics and Evolution 308: 16.
  43. Saavedra, M.M., Monge, M. & Guimarães, E.F. (2014) Dasyphyllum diamantinense (Asteraceae, Barnadesioideae): a new species from the Chapada Diamantina, Bahia State, Brazil. Phytotaxa 174: 231–236.
  44. Small, J.K. (1903) Flora of the southeastern United States; being descriptions of the seed-plants, ferns and fern-allies growing naturally in North Carolina, South Carolina, Georgia, Florida, Tennessee, Alabama, Mississippi, Arkansas, Louisiana, and in Oklahoma and Texas east of the one hundredth meridian. 1st. Edition. Published by the author, New York, 1370 pp.
  45. Sobral, M. & Stehmann, J.R. (2009) An analysis of new angiosperm species discoveries in Brazil (1990-2006). Taxon 58: 227–232.
  46. Thiers, B.M. (2023 [updated continuously]) IndexHerbariorum. Available from: (accessed 15 July 2023).