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Issue: Vol. 618 No. 2: 3 Oct. 2023
Type: Article
Published: 2023-10-03
DOI: 10.11646/phytotaxa.618.2.3
Page range: 133-148
Abstract views: 159
PDF downloaded: 16

Calea × crassa (Neurolaeneae: Asteraceae), a new nothospecies from Paraná state, Brazil

Universidade Federal do Rio Grande do Sul; Programa de Pós-graduação em Botânica; Laboratório de Sistemática Vascular; Prédio 43432; sala 107; Porto Alegre; RS 91501-970; Brazil; Jardim Botânico da Fundação Zoobotânica de Belo Horizonte – Belo Horizonte; MG 31364-450; Brazil
Universidade Federal do Rio Grande do Sul; Programa de Pós-graduação em Botânica; Laboratório de Ficologia; Museu de Ciências Naturais - Sema/RS; Porto Alegre; RS 90690-000; Brazil
Centro Universitário Una; Belo Horizonte; MG; Brazil
Universidade Estadual de Mato Grosso do Sul; Laboratório de Macroecologia & Evolução (LAMEV); BR-163; Mundo Novo; MS. Brazil; 79980-000; Brazil
Embrapa Clima Temperado; Rodovia BR 392; km 78; Caixa Postal 403; Pelotas; RS 96010-971; Brazil
Eudicots Compositae Escarpa Devoniana Grasslands Hybrid Niche modelling

Abstract

Calea × crassa, a new nothospecies is described and illustrated. The thickened pale olivaceous leaf margins along with the mucronate teeth are unique morphological features shared with its parental species C. ilienii and C. monocephala. The nothospecies can be distinguished from C. ilienii by the concolorous leaves (vs. discolorous leaves), involucre 6-seriate (vs. 5-seriate), second series of phyllaries with foliaceous base (vs. scarious base), and bigger scales 1.8–1.9 mm long, when present (vs. 1–1.5 mm, when present). It is differentiated from C. monocephala by the third series of phyllaries with acuminate apex (vs. apiculate, sometimes rounded), the narrow oblong sixth series of phyllaries (vs. oblanceolate, when present), and the bigger scales 1.8–1.9 mm long, when present (vs. 2.1–2.2 mm, when present). In addition to these characters, a principal component analysis also supports the traits differentiating the new hybrid from its parental taxa. Geographic distributions of C. × crassa and its parental species are mapped, including a modelled prediction occurrence map for the nothospecies. A taxonomic key for identification of the parents and the nothospecies is provided and the key morphological characters of these three taxa are illustrated.

 

References

  1. Alvarez, I. & Wendel, J.F. (2003) Ribosomal ITS sequences and plant phylogenetic inference. Molecular Phylogenetics and Evolution 29 (3): 417–434. https://doi.org/10.101/s1055-7903(03)00208-26
  2. Araújo, M.B. & New, M. (2006) Ensemble forecasting of species distributions. Trends in Ecology and Evolution 22 (1): 42–47. https://doi.org/10.1016/j.tree.2006.09.010
  3. Azevedo, C.O., Borba, E.L. & Berg, C.V.D. (2006) Evidence of natural hybridization and introgression in Bulbophyllum involutum Borba, Semir & F. Barros and B. weddellii (Lindl.) Rchb. f. (Orchidaceae) in the Chapada Diamantina, Brazil, by using allozyme markers. Revista Brasileira de Botânica 29 (3): 415–421. https://doi.org/10.1590/S0100-84042006000300008
  4. Baker, J.G. (1884) Compositae: Helianthoideae. In: Martius, C.F.P. & Eichler, A.W. (Eds.) Flora brasiliensis, vol. 6 (3). Oldenbourgh, München & Leipzig, pp. 251–258.
  5. Barroso, G.M. (1975) De Compositarum Novitatibus. Sellowia 26: 102–118.
  6. Batista, J.A.N. & Medeiros, A.S. (2022) A new putative natural hybrid of Cyrtopodium (Orchidaceae) from the South coast of Brazil. Phytotaxa 536 (3): 1–28. https://doi.org/10.11646/phytotaxa.536.3.8
  7. Beentje, H. (2016) The Kew Plant Glossary: an Illustrated Dictionary of Plant Terms. Kew Publishing, Richmond, 184 pp.
  8. BFG (2021) Brazilian Flora 2020: Leveraging the power of collaborative scientific network. Taxon 71 (1): 178–198. https://doi.org/10.1002/tax.12640
  9. Breiman, L. (2001) Random forests. Machine Learning 45: 5–32. https://doi.org/10.1023/A:1010933404324
  10. Brochmann, C. (1987) Evaluation of some methods for hybrid analysis, exemplified by hybridization in Argyranthemum (Asteraceae). Nordic Journal of Botany 7: 609–630. https://doi.org/10.1111/j.1756-1051.1987.tb02030.x
  11. Bueno, V.R. (2023) Neurolaeneae Systematics. Universidade Federal do Rio Grande do Sul, Porto Alegre, 377 pp.
  12. Bueno, V.R. & Heiden, G. (2021) Calea funkiana (Compositae, Neurolaeneae), A New Species Endemic From Serra do Cipó, Minas Gerais, Brazil. Systematic Botany 46 (2): 470–475. https://doi.org/10.1600/036364421X16231782047497
  13. Bueno, V.R. & Heiden, G. (2022a) Novelties in Calea sect. Meyeria (Asteraceae, Neurolaeneae) from Brazil. Systematic Botany 47 (2): 575–585. https://doi.org/10.1600/036364422X16512564801632
  14. Bueno, V.R. & Heiden, G. (2022b) Calea sessilifolia (Asteraceae, Neurolaeneae), an unusual new species from the Diamantina Plateau, Minas Gerais, Brazil. Systematic Botany 47 (2): 586–592. https://doi.org/10.1600/036364422X16512564801687
  15. Bueno, V.R., Cassol, A.P.V., Leroy, C.J., Bueno, M.L. & Heiden, G. (2023) Two noteworthy Calea (Asteraceae: Neurolaeneae) from contact areas of the Atlantic Forest and Cerrado of Brazil. Phytotaxa 579 (3): 143–288. https://doi.org/10.11646/phytotaxa.579.3.1
  16. Bueno, V.R., Gostel, M.R. & Heiden, G. (2021) An overview of Neurolaeneae (Compositae). Capitulum 1: 36–43. https://doi.org/10.53875/capitulum.01.1.03
  17. Bueno, V.R., Gostel, M.R. & Heiden, G. (2022) Calea repanda (Asteraceae, Neurolaeneae), a new species of Calea and new taxonomic implications for the genus. Phytotaxa 544 (3): 280–288. https://doi.org/10.11646/phytotaxa.544.3.2
  18. C. V. Starr Virtual Herbarium (2023) New York Botanical Garden. Available from: http://sweetgum.nybg.org/science/vh/ (accessed: 29 Jan 2023).
  19. Cantuária, P.C., Krahl, D.R.P., Krahl, A.H., Chiron, G. & Silva, J.B.F. (2021) Catasetum × sheyllae (Orchidaceae: Catasetinae), a new natural hybrid from Brazilian Amazon. Phytotaxa 527 (4): 257–265. https://doi.org/10.11646/phytotaxa.527.4.3
  20. Diaz-Piedrahita, S. & Rodríguez-Cabeza, B.V. (2012) Novedades em Asteráceas Colombianas II. Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales 36 (141): 501–515.
  21. Dittrich, V.A.O., Monteiro, R. & Salino, A. (2015) The Blechnum occidentale (Blechnaceae, Polypodiopsida) species group in southern and southeastern Brazil. Phytotaxa 231 (3): 201–229. https://doi.org/10.11646/phytotaxa.231.3.1
  22. Dusén, P.K.H. (1910) Neue Gefasspflanzen aus Paraná (Siidbrasilien). Arkiv for Botanik 9 (15): 1–37.
  23. Ellis, B., Daly, D.C., Hickey, L.J., Johnson, K.R., Mitchell, J.D., Wilf, P. & Wing, S.L. (2009) Manual of Leaf Architecture. The New York Botanical Garden Press, New York, 190 pp. https://doi.org/10.1079/9781845935849.0000
  24. Ellstrand, N.C., Whitkus, R. & Rieseberg, L.H. (1996) Distribution of spontaneous plant hybrids. PNAS 93: 5090–5093. https://doi.org/10.1073/pnas.93.10.5090
  25. Engels, M.E. & Canestraro, B.K. (2017) ×Cyclobotrya: A new hybrid genus between Cyclodium and Polybotrya (Dryopteridaceae) from the Brazilian Amazon. Brittonia 69 (3): 307–312. https://doi.org/10.1007/s12228-017-9468-2
  26. Engels, M.E., Meyer, T.A. & Soares, K.P. (2021) Um novo ×Buetyagrus (Arecaceae) do Planalto sul brasileiro. Hoehnea 48: e412020. https://doi.org/10.1590/2236-8906-41/2020
  27. Fick, S.E. & Hijmans, R.J. (2017) WorldClim 2: new 1km spatial resolution climate surfaces for global land areas. International Journal of Climatology 37 (12): 4302–4315. https://doi.org/10.1002/joc.5086
  28. Flora e Funga do Brasil (2023) Jardim Botânico do Rio de Janeiro. Available from: http://floradobrasil.jbrj.gov.br/ (accessed: 31 Aug. 2023).
  29. Forester, B.R., De Chaine, E.G. & Bunn, A.G. (2013) Integrating ensemble species distribution modelling and statistical phylogeography to inform projections of climate change impacts on species distributions. Diversity and Distributions 19: 1480–1495. https://doi.org/10.1111/ddi.12098
  30. Funk, V.A., Susanna, A., Stuessy, T.F. & Robinson, H. (2009) Systematics, Evolution and Biogeography of Compositae. International Association for Plant Taxonomy, Vienna, 965 pp.
  31. Gonçalves, C.N. & Azevêdo-Gonçalves, C.F. (2009) A new hybrid bromliad from southernmost Brazil, Tillandsia × baptistana. Novon 19: 353–356. https://doi.org/10.3417/2001154
  32. Graham, M.H. (2003) Confronting multicollinearity in ecological multiple regression. Ecology 84: 2809–2815. https://doi.org/10.1890/02-3114
  33. Gruenstaudl, M., Carstens, B.C., Santos-Guerra, A. & Jansen, R.K. (2017) Statistical hybrid detection and the inference of ancestral distribution in Tolpis (Asteraceae). Biological Journal of the Linnean Society 121: 133–149. https://doi.org/10.1093/biolinnean/blw014
  34. Harfouche, T.B., Corte, A.P.D., Ruza, M.S. & Rex, F.E. (2019) Dinâmica do uso do solo na APA da Escarpa Devoniana e seu entorno. Enciclopédia Biosfera 16 (29): 702–715. https://doi.org/10.18677/EnciBio_2019A55
  35. Hickey, L.J. (1973) Classification of the architecture of dicotyledonous leaves. American Journal of Botany 60: 17–33. https://doi.org/10.1002/j.1537-2197.1973.tb10192.x
  36. Hijmans, R.J. & Graham, C.H. (2006) Testing the ability of climate envelope models to predict the effect of climate change on species distributions. Global Change Biology 12: 2272–2281. https://doi.org/10.1111/j.1365-2486.2006.01256.x
  37. IUCN (2022) Guidelines for using the IUCN red list categories and criteria, version 15.1. Prepared by the Standards and Petitions Committee of the IUCN Species Survival Commission, Cambridge U.K. Available from: http://www.iucnredlist.org/resources/redlistguidelines (accessed: 11 September 2023).
  38. Krahl, A.H., Krahl, D.R.P. & Pansarin, E. (2021) Ionopsis × atalibae (Orchidaceae, Oncidiinae), a new natural hybrid from the Brazilian Amazon. Phytotaxa 478 (2): 268–274. https://doi.org/10.11646/phytotaxa.478.2.8
  39. Krahl, D.R.P., Krahl, A.H. & Chiron, G.R. (2020) Catasetum × loisiae (Orchidaceae: Catasetinae), a new natural hybrid for the Brazilian Amazon. Richardiana, nouvelle série 4: 214‒223.
  40. Krahl, D.R.P., Schmal, P., Chiron, G., Silva, J.B.F., Krahl, A.H. & Cantuária, P.C. (2023) Catasetum × grasineideae (Orchidaceae: Catasetinae), a new nothospecies from Brazilian Amazon and taxonomic notes for the genus. Phytotaxa 594 (2): 1‒26. https://doi.org/10.11646/phytotaxa.594.2.1
  41. Labiak, P.H. & Matos, F.B. (2007) A new hybrid and two new combinations in neotropical grammitid ferns. Brittonia 59 (2): 182‒185. https://doi.org/10.1663/0007-196X(2007)59[182:ANHATN]2.0.CO;2
  42. Lawalrée, A. (1982) Une asteracée américaine introduite au Zaire: Calea urticifolia (Miller) DC. Bulletin du Jardin Botanique National de Belgique 52: 129‒132. https://doi.org/10.2307/3668051
  43. Linnaeus, C. von. (1763) Species plantarum, ed. 2, vol. 2. L. Salvius, Stockholm, 1684 pp.
  44. Loeuille, B., Semir, J., Lohmann, L.G. & Pirani, J.R. (2015) A phylogenetic analysis of Lycnophorinae (Asteraceae: Vernonieae) based on molecular and morphological data. Systematic Botany 40 (1): 299–315. https://doi.org/10.1600/036364415X686585
  45. Malme, G.O.A. (1933) Compositae paranenses. Kongliga Svenska Vetenskaps Academiens Handlingar 12 (2): 1–122.
  46. McCullagh, P. & Nelder, J.A. (1989) Generalized Linear Models. Chapman and Hall, London, 510 pp. https://doi.org/10.1007/978-1-4899-3242-6
  47. Mitchell, N., Campbell, L.G., Ahern, J.R., Paine, K.C., Giroldo, A.B. & Whitney, K.D. (2019) Correlates of hybridization in plants. Evolution Letters 3–6: 570–585. https://doi.org/10.1002/evl3.146
  48. Mundell, A.R.G. (2016) The genus Conyza in Britain and a name for the hybrid between Erigeron acris and Conyza floribunda (Asteraceae). New Journal of Botany 6 (1): 16–20. https://doi.org/10.1080/20423489.2016.1173806
  49. Naimi, B., Hamm, N.A., Groen, T.A., Skidmore, A.K. & Toxopeus, A.G. (2014) Where is positional uncertainty a problem for species distribution modelling? Ecography 37: 191–203. https://doi.org/10.1111/j.1600- 0587.2013.00205.x
  50. Nauheimer, L., Cui, L., Clarke, C., Crayn, D.M., Bourke, G. & Nargaret, K. (2019) Genome skimming provides well resolved plastid and nuclear phylogenies, showing patterns of deep reticulate evolution in the tropical carnivorous plant genus Nepenthes (Caryophyllales). Australian Systematic Botany 32: 243–254. https://doi.org/10.1071/SB18057
  51. Oksanen, J., Blanchet, F.G., Friendly, M., Kindt, R., Legendre, P., McGlinn, D., Minchin, P.R., O’Hara, R.B., Simpson, G.L., Solymos, P., Stevens, M.H.H., Szoecs, E. & Wagner, H. (2020) Vegan: Community Ecology Package (Version 2.5-6) [Software]. Retrieved from https://CRAN.R-project.org/package=vegan (accessed 2 October 2023).
  52. Panero, J.L. (2007) Tribe Heliantheae Cass. In: Kubitzki, K. (Ed.) The Families and Genera of Vascular Plants, vol. 8. Springer Verlag, Berlin, pp. 440–447.
  53. Pena, N.T.L., Schwartsburd, P.B. & Alves-Araújo, A. (2017) Anemiaceae from Pedra do Elefante, Espírito Santo State, Brazil, with notes on a new hybrid. Hoehnea 44 (4): 589–598. https://doi.org/10.1590/2236-8906-105/2016
  54. Pereira, J.B.S., Nunes, M.G. & Labiak, P.H. (2022) Novelties in the Anemia elegans Clade (Anemiaceae), with a New Species and Nothospecies from Brazil. American Society of Plant Taxonomists 47 (3): 840–845. https://doi.org/10.1600/036364422X16573019348364
  55. Phillips, S.J., Anderson, R.P. & Schapire, R.E. (2006) Maximum entropy modeling of species geographic distributions. Ecological Modelling 190: 231–259. https://doi.org/10.1016/j.ecolmodel.2005.03.026
  56. Pliszko, A. & Kostrakiewicz-Gieralt, K. (2018) The morphological intermediacy of Erigeron × huelsenii (Asteraceae), a hybrid between E. acris and E. canadensis. Turkish Journal of Botany 42: 543–550. https://doi.org/10.3906/bot-1711-27
  57. Pozo, P. & Hind, D.J.N. (2013) A new species of Calea sect. Meyeria (Compositae: Heliantheae: Neurolaeninae), Calea woodi, from Santa Cruz, Bolivia. Kew Bulletin 68: 1–5. https://doi.org/10.1007/s12225-013-9463-z
  58. Pruski, J.F. (1984) Calea brittoniana and Calea kristiniae: Two New Compositae from Brazil. Brittonia 36: 98–103. https://doi.org/10.2307/2806617
  59. Pruski, J.F. (1997) Calea L. In: Steyermark, J.A., Berry, P.E. & Holst, B.K. (Eds.) Flora of the Venezuelan Guayana, vol. 3. Missouri Botanical Garden, St. Louis, pp. 221–236.
  60. Pruski, J.F. (1998) Novelties in Calea (Compositae: Heliantheae) from South America. Kew Bulletin 53: 683–693. https://doi.org/10.2307/4110487
  61. Pruski, J.F. (2005) Studies of Neotropical Compositae—I. Novelties in Calea, Clibadium, Conyza, Llerasia, and Pluchea. Sida 21: 2023–2037.
  62. Pruski, J.F. (2011) Compositae of the Guayana Highland—XIV. Four new species of Calea (Neurolaeneae) from Tepui summits in Venezuela. Phytoneuron 52: 1–9.
  63. Pruski, J.F. (2013) Studies of Neotropical Compositae—IX. Four new species of Calea (Neurolaeneae) from Bolivia, Brazil and Paraguay. Phytoneuron 72: 1–4.
  64. Pruski, J.F. & Hind, D.J.N. (1998) Two new species of Calea (Compositae: Heliantheae) from Serra do Grão Mogol and Vicinity, Minas Gerais, Brazil. Kew Bulletin 53: 695–701. https://doi.org/10.2307/4110488
  65. Pruski, J.F. & Robinson, H.E. (2018) Asteraceae. In: Davidse, G., Sánchez, M.S., Knapp, S. & Cabrera, F.C. (Eds.) Flora Mesoamericana, vol. 5 (2). Missouri Botanical Garden, Saint Louis, pp. 1–608.
  66. Pruski, J.F. & Urbatsch, L.E. (1983) Calea bucaramangensis (Asteraceae), a new species from the Colombian Andes. Systematic Botany 8 (1): 93–95. https://doi.org/10.2307/2418567
  67. Pruski, J.F. & Urbatsch, L.E. (1987) Calea dalyi (Compositae: Heliantheae), a new species from the Serranía de Santiago, Bolivia. Brittonia 39: 201–204. https://doi.org/10.2307/2807375
  68. Pruski, J.F. & Urbatsch, L.E. (1988) Five new species of Calea (Compositae: Heliantheae) from Planaltine Brazil. Brittonia 40: 341–356. https://doi.org/10.2307/2807644
  69. QGIS Develpment Team (2015) QGIS Geographic Information System, Open Source Geospatial Foundation Project. Available from: http://qgis.osgeo.org (accessed: 10 Dec. 2022).
  70. R Core Team (2023) R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. [https://www.R-project.org/]
  71. Reflora (2023) Herbário Virtual. Avalable from: https://reflora.jbrj.gov.br/reflora/herbarioVirtual/ (accessed 25 Jan. 2023).
  72. Reis-Silva, G.A. (2019) The Genera Calea L. (Neurolaeneae, Asteraceae) in Minas Gerais. Brazil. Universidade Federal de Viçosa, Viçosa, 181 pp.
  73. Reis-Silva, G.A. & Nakajima, J.N. (2020) A new species of Calea (Neurolaeneae, Asteraceae) from the Espinhaço Range, Minas Gerais, Brazil. Phytotaxa 432 (2): 199–205. https://doi.org/0.11646/phytotaxa.432.2.9
  74. Reis-Silva, G.A. & Nakajima, J.N. (2021) A new species of Calea (Neurolaeneae, Asteraceae) from the Atlantic Forest, Minas Gerais, southeastern Brazil. Phytotaxa 490 (1): 129–136. https://doi.org/10.11646/phytotaxa.494.1.9
  75. Reis-Silva, G.A., Silva, G.H.L., Roque, N. & Bueno, V.R. (2023) Calea in Flora & Funga do Brasil. Jardim Botânico do Rio de Janeiro. Available from: http://floradobrasil.jbrj.gov.br/reflora/floradobrasil/FB103751 (accessed: 13 Jan. 2023).
  76. Robinson, H. (1975) Studies in the Heliantheae (Asteraceae). VI. Additions to the genus Calea. Phytologia 32 (5): 426–430.
  77. Robinson, H. (1979) Studies in the Heliantheae (Asteraceae). XIX. Four new species of Calea from Brasil. Phytologia 44 (4): 270–276.
  78. Roque, N. & Carvalho, V.C. (2011) Estudos taxonômicos do gênero Calea (Asteraceae, Neurolaeneae) no estado da Bahia, Brasil. Rodriguésia 62: 547–561. https://doi.org/10.1590/2175-7860201162308
  79. Rydberg, A. (1927) (Carduales) Carduaceae, Liabeae, Neurolaeneae, Senecioneae. In: North American Flora, vol. 34 (4). New York Botanical Garden, New York, pp. 289–360.
  80. Schilling, E.E. (2011) Hybrid genera in Liatrinae (Asteraceae: Eupatorieae). Molecular Phylogenetics and Evolution 59: 158–167. https://doi.org/10.1016/j.ympev.2011.01.011
  81. Semple, J.C. (2016) Documenting a Solidago bicolor × S. brendiae hybrid (Asteraceae: Astereae) from Nova Scotia. Phytoneuron 2016 (23): 1–10.
  82. Silva, G.H.L. (2016) Estudos Taxonômicos do Gênero Calea L. (Asteraceae: Neurolaeneae) na região Centro-Oeste do Brasil. Universidade Federal de Goiás, Goiânia, 165 pp.
  83. Silva, G.H.L. & Teles, A.M. (2018) Calea (Asteraceae, Neurolaeneae) no estado de Goiás, Brasil. Rodriguesia 69 (4): 1851–1875. https://doi.org/10.1590/2175-7860201869422
  84. Silva, G.H.L., Bringel, J.B. & Teles, A.M. (2016) A new species of Calea (Asteraceae—Neurolaneae) from Goiás State, Brazil. Phytotaxa 265: 279–284. https://doi.org/10.11646/phytotaxa.265.3.9
  85. Smith, G.F. & Figueiredo, E. (2020) × Bacurio, a new nothogenus for the hybrid × B. delphinatifolius (Baculellum articulatum × Curio rowleyanus), with notes on the nomenclature of Kleinia × peregrina, Senecio peregrinus, S. × peregrinus, and Curio × peregrinus (Asteraceae: Asteroideae: Senecioneae). Phytotaxa 458 (1): 1–28. https://doi.org/10.11646/phytotaxa.458.1.8
  86. Smithsonian National Museum of Natural History (2023) Collection NHMN. Available from: https://collections.nmnh.si.edu/search/botany/ (accessed: 25 Jan. 2023).
  87. Soltis, P.S. & Soltis, D.E. (2009) The role of hybridization in plant speciation. Annual Review of Plant Biology 60: 561–588. https://doi.org/10.1146/annurev.arplant.043008.092039
  88. Specieslink (2023) SpeciesLink network. Available from: https://specieslink.net/search/ (accessed: 14 Jan. 2023).
  89. Thiers, B. (2023) [continuously updated] Index Herbariorum: A global directory of public herbaria and associated staff. New York Botanical Garden’s Virtual Herbarium, New York U.S.A. Available from: http://sweetgum.nybg.org/science/ih/ (accessed: 17 Jan. 2023).
  90. Tropicos.org (2023) Missouri Botanical Garden. Available from: https://tropicos.org (accessed: 14 Feb. 2023).
  91. Urbatsch, L.E., Zlotsky, A. & Pruski, J.F. (1986) Revision of Calea sect. Lemmatium (Asteraceae: Heliantheae) from Brazil. Systematic Botany 11 (4): 501–514. https://doi.org/10.2307/2419029
  92. Waechter, J. & Ferreira, G.E. (2013) Sinningia × vacariensis (Gesneriaceae) from Southern Brazil, the first natural hybrid for the genus. Phytotaxa 119 (1): 45–50. https://doi.org/10.11646/phytotaxa.119.1.4
  93. Wang, Z., Du, S., Dayanandan, S., Wang, D., Zeng, Y. & Zhang, J. (2014) Phylogeny Reconstruction and Hybrid Analysis of Populus (Salicaceae) Based on Nucleotide Sequences of Multiple Single-Copy Nuclear Genes and Plastid Fragments. PLOS One 9 (8): e103645. https://doi.org/10.1371/journal.pone.0103645
  94. Wendt, T., Canela, M.B.F., Faria, A.P.G. & Rios, R.I. (2001) Reproductive biology and natural hybridization between two endemic species of Pitacairnia (Bromelliaceae). American Journal of Botany 88 (10): 1760–1767. https://doi.org/10.2307/3558350
  95. Wickham, H., Chang, W., Henry, L., Pedersen, T.L., Takahashi, K., Wilke, C., Woo, K., Yutani, H. & Dunnington, D. (2020) RStudio. ggplot2: Create Elegant Data Visualisations Using the Grammar of Graphics (Version 3.3.0). Retrieved from: https://cran.r-project.org/web/packages/ggplot2/index.html (accessed 2 October 2023).
  96. Wussow, J.R., Urbatsch, L.E. & Sullivan, G.A. (1985) Calea (Asteraceae) in Mexico, Central America and Jamaica. Systematic Botany 10 (3): 241–267. https://doi.org/10.2307/2418590
  97. Zanella, C.M., Palma-Silva, C., Goetze, M. & Bered, F. (2016) Hybdridization between two sister species of Bromeliaceae: Vriesea carinata and V. incurvata. Botanical Journal of the Linnean Society 181: 491–504. https://doi.org/10.1111/boj.12424