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Issue: Vol. 751 No. 1: 10 Apr. 2026
Type: Article
Published: 2026-04-10
DOI: 10.11646/phytotaxa.751.1.2
Page range: 15-24
Abstract views: 0
PDF downloaded: 0

Philodendron angelicanum (Araceae): an endangered new species endemic to the Atlantic Forest of Rio de Janeiro, Brazil

Escola Nacional de Botânica Tropical, Instituto de Pesquisa Jardim Botânico do Rio de Janeiro, 1008 Jardim Botânico St., Jardim Botânico, 22460-000, Rio de Janeiro, RJ, Brazil
Escola Nacional de Botânica Tropical, Instituto de Pesquisa Jardim Botânico do Rio de Janeiro, 1008 Jardim Botânico St., Jardim Botânico, 22460-000, Rio de Janeiro, RJ, Brazil
Department of Sciences, Faculdade de Formação de Professores, Universidade do Estado do Rio de Janeiro, 24435-005, São Gonçalo, RJ, Brazil
Instituto de Pesquisa Jardim Botânico do Rio de Janeiro, R. Pacheco Leão, 915, Jardim Botânico, 22460-000, Rio de Janeiro, RJ, Brazil
Escola Nacional de Botânica Tropical, Instituto de Pesquisa Jardim Botânico do Rio de Janeiro, 1008 Jardim Botânico St., Jardim Botânico, 22460-000, Rio de Janeiro, RJ, Brazil
conservation endemism Fluminense flora section Macrobelium taxonomy Monocots

Abstract

A new species of Araceae, Philodendron angelicanum, endemic to the Atlantic Forest of the state of Rio de Janeiro, belonging to the subgenus Philodendron sect. Macrobelium, is described. Morphologically similar to P. cordatum and P. appendiculatum, the species is differentiated by the striated and flat petiole along the entire length, with obtuse to acute margins and few extra-floral vinaceous nectaries at the base. The leaf blade is lustrous, with repanded margins. The spathe is slightly constricted and the spadix has no sterile apical zone. The ovary has 10–12 locules and 2–3 ovules per locule. The study presents ecological comments on the species, considering its rarity and exclusive occurrence in the municipality of Cachoeiras de Macacu, in fragments of Submontane Dense Ombrophilous Forest. Its area and extent of occurrence are limited, with subpopulations restricted to a small fragment of forest, being classified as “Endangered” (EN), according to the criteria of IUCN (2019) B1ab(i, iv); B2ab(ii, iv).

References

  1. Bachman, S., Moat, J., Hill, A.W., Torre, J. & Scott, B. (2011) Supporting Red List threat assessments with GeoCAT: geospatial conservation assessment tool. ZooKeys 150: 117–126. https://doi.org/10.3897/zookeys.150.2109
  2. Boyce, P.C. & Croat, T.B. (2011 onwards) The Überlist of Araceae, Totals for Published and Estimated Number of Species in Aroid Genera. Available from: http://www.aroid.org/genera/180211uberlist.pdf (accessed 24 February 2025)
  3. Bunting, G.S. (1986) New taxa of Venezuelan Araceae. Phytologia 60: 293–344. https://doi.org/10.5962/bhl.part.3802
  4. Calazans, L.S.B. (2020) A new species of Philodendron (Araceae) from an enclave of Atlantic rainforest in Minas Gerais State, Brazil. Phytotaxa 452: 217–223. https://doi.org/10.11646/phytotaxa.452.3.4
  5. Calazans, L.S.B., Antas, N.G. & Sakuragui, C.M. (2015) A new species of Philodendron (Araceae) from southeastern Brazil. Botanical Studies 56: 1–5. https://doi.org/10.1186/s40529-015-0082-x
  6. Coelho, M.A.N. (2000) Philodendron Schott (Araceae): morfologia e taxonomia das espécies da Reserva Ecológica de Macaé de Cima, Nova Friburgo, Rio de Janeiro, Brasil. Rodriguésia 51: 21–68. https://doi.org/10.1590/2175-7860200051787902
  7. Coelho, M.A.N. & Mayo, S.J. (1998) Cinco espécies novas do gênero Philodendron Schott (Araceae) para o Brasil. Boletim de Botânica da Universidade de São Paulo 17: 47–60. https://doi.org/10.11606/issn.2316-9052.v17i0p47-60
  8. Croat, T.B. (1985) Collecting and preparing specimens of Araceae source. Annals of the Missouri Botanical Garden 72: 252–258. https://doi.org/10.2307/2399178
  9. Dáttilo, W., Marques, E.C., Falcão, J.C.F. & Moreira, D.D.O. (2009) Interações mutualísticas entre formigas e plantas. EntomoBrasilis 2: 32–36. https://doi.org/10.12741/ebrasilis.v2i2.44
  10. Del-Claro, K., Berto, V. & Réu, W. (1996) Effect of herbivore deterrence by ants increase fruit set in an extrafloral nectary plant, Qualea multiflora (Vochysiaceae). Journal of Tropical Ecology 12: 887–892. https://doi.org/10.1017/S0266467400010142
  11. Engler, A. (1899) Revision der Gattung Philodendron Schott. In: Beiträge zur Kenntnis der Araceae IX. 16. Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 26: 510–515.
  12. Engler, A. & Krause, K. (1913) Araceae-Philodendroideae-Philodendrinae. Das Pflanzenreich Regni vegetabilis conspectus 60 (IV 23Db): 1–143.
  13. Gibernau, M. (2003) Pollinators and visitors of aroid inflorescences. Aroideana 26 (11): 73–91.
  14. Horvitz, C.C. & Schemske, D.W. (1984) Effects of ants and na ant-tended herbivore on seed production of a neotropical herb. Ecology 65: 1369–1378. https://doi.org/10.2307/1939117
  15. IBGE (2012) Manual técnico da vegetação brasileira: sistema fitogeográfico, inventário das formações florestais e campestres, técnicas e manejo de coleções botânicas, procedimentos para mapeamentos. 2 ed. Coordenação de Recursos Naturais e Estudos Ambientais. Instituto Brasileiro de Geografia e Estatística, Rio de Janeiro, 276 pp.
  16. Instituto de Pesquisas Jardim Botânico do Rio de Janeiro (2025) Catálogo da Flora do Estado do Rio de Janeiro. Available from: https://florariojaneiro.jbrj.gov.br/ (accessed 24 February 2025)
  17. IUCN (2019) The guidelines for using the IUCN Red List categories and criteria. Version 14. Available from: https://www.iucn.org/resources/conservation-tools/red-list (accessed 24 February 2025)
  18. Kottek, M., Grieser, J., Beck, C., Rudolf, B. & Rubel, F. (2006) World map of the Köppen-Geiger climate classification updated. Meteorologische Zeitschrift 15: 259–263. https://doi.org/10.1127/0941-2948/2006/0130
  19. Macedo, M. (2020) geobr: A package to read and write geographic data sets of Brazil. R package version 0.3.4. Available from: https://github.com/codeforamerica/geobr (accessed 27 February 2025)
  20. Magno, A. & Calazans, L.S.B. (2025) Unveiling an iconic Philodendron (Araceae) species from the Atlantic Forest of Espírito Santo State, Brazil. Phytotaxa 689: 223–232. https://doi.org/10.11646/phytotaxa.689.2.5
  21. Martius, C.F.P. de (1878) Flora Brasiliensis, enumeratio plantarum in Brasilia hactenus detectarum :quas suis aliorumque botanicorum studiis descriptas et methodo naturali digestas partim icone illustratas. Vol. 3. pt. 2.
  22. Mattos, J.R., Coelhos, M.A.N. & Baumgratz, J.F.A. (2023) New species of Philodendron (Araceae) from the Brazilian Atlantic Forest. Rodriguésia 74: 1–6. https://doi.org/10.1590/2175-7860202374004
  23. Mayo, S.J., Bogner, J. & Boyce, P.C. (1997) The Genera of Araceae. Royal Botanic Gardens, Kew, 370 pp.
  24. Nauheimer, L., Metzler, D. & Renner, S.S. (2012) Global history of the ancient monocot family Araceae inferred with models accounting for past continental positions and previous ranges based on fossils. New Phytologist 195: 938–950. https://doi.org/10.1111/j.1469-8137.2012.04220.x
  25. Oliveira, P.S., Rico-Gray, V., Díaz-Castelazo, C. & Castilho-Guevara, C. (1999) Interaction between ants, extrafloral nectaries and insect herbivores in Neotropical coastal and dunes: herbivore deterrence by visiting ants increases fruit set in Opintia stricta (Cactacea). Functional Ecology 13: 623–631. https://doi.org/10.1046/j.1365-2435.1999.00360.x
  26. RStudio Team (2020) RStudio: Integrated Development Environment for R. RStudio, PBC. Available from: https://www.rstudio.com (accessed 27 February 2025)
  27. Sakuragui, C.M. (2001) Biogeografia de Philodendron seção Calostigma (Schott) no Brasil. Acta Scientiarum 23: 561–569.
  28. Sakuragui, C.M., Mayo, S.J. & Zappi, D.C. (2005) Taxonomic revision of Brazilian species of Philodendron section Macrobelium. Kew Bulletin 60: 465–513.
  29. Sakuragui, C.M., Calazans, L.S.B., Soares, M.L., Mayo, S.J. & Ferreira, J.B. (2025) Philodendron in Flora e Funga do Brasil. Jardim Botânico do Rio de Janeiro. Available from: https://floradobrasil.jbrj.gov.br/FB5015 (accessed 24 February 2025)
  30. Schott, H.W. (1829) Für Liebhaber der Botanik. Wiener Zeitschrift für Kunst, Literatur, Theater und Mode 94: 779–780.
  31. Schott, H.W. (1853) Aroideae. Oesterreichisches Botanisches Wochenblatt 3 (47): 377–378. https://doi.org/10.1007/BF02054083
  32. Schott, H.W. (1856) Synopsis Aroidearum: complectens enumerationem systematicam generum et specierum hujus ordinis. Typis Congregationis Mechitharisticae, Vindobonae, 140 pp.
  33. Schott, H.W. (1859) Aroideenskizzen. Oesterreichische Botanische Zeitschrift 9: 98–101. https://doi.org/10.1007/BF02310393
  34. Schott, H.W. (1860) Prodromus systematis Aroidearum. Typis Congregationis Mechitharisticae, Vienna, 268 pp.
  35. SOS Mata Atlântica (2017) Atlas dos remanescentes florestais da Mata Atlântica, período 2015-2016. Relatório técnico. Fundação SOS Mata Atlântica, São Paulo, 69 pp.
  36. Stearn, W.T. (1993) Botanical Latin. David & Charles, Newton Abbot, Great Britain, 566 pp.
  37. Thiers, B. (2025 onwards) Index Herbariorum: A global directory of public herbaria and associated staff, The New York Botanical Garden. Available from: http://sweetgum.nybg.org/ih/ (accessed 25 February 2025)
  38. Wickham, H. (2016) ggplot2: Elegant Graphics for Data Analysis. Springer-Verlag New York. Available from: https://ggplot2.tidyverse.org (accessed 27 February 2025)
  39. Wickham, H., François, R., Henry, L. & Müller, K. (2023) readr: Read Rectangular Text Data. R package version 2.1.2. Available from: https://cran.r-project.org/web/packages/readr/index.html (accessed 27 February 2025)
  40. Wilke, C.O. (2020) cowplot: Streamlined Plot Theme and Plot Annotations for ‘ggplot2’. R package version 1.1.1. Available from: https://cran.r-project.org/web/packages/cowplot/index.html (accessed 27 February 2025)

How to Cite

Da Silva Dutra Junior, D.L., Machado, D.N.D.S., Damasceno, D.B.M., Coelho, M.A.N. & Sakuragui, C.M. (2026) Philodendron angelicanum (Araceae): an endangered new species endemic to the Atlantic Forest of Rio de Janeiro, Brazil. Phytotaxa 751 (1): 15–24. https://doi.org/10.11646/phytotaxa.751.1.2