Skip to main content Skip to main navigation menu Skip to site footer
Responsive image
Issue: Vol. 740 No. 2: 5 Feb. 2026
Type: Article
Published: 2026-02-05
DOI: 10.11646/phytotaxa.740.2.10
Page range: 217-222
Abstract views: 216
PDF downloaded: 6

Amorphophallus calladoi (Araceae), a new species from Luzon Island, Philippines

Philippine Taxonomic Initiative, Inc., Brgy. Maligaya, El Nido, Palawan, 5313, Philippines
Philippine Taxonomic Initiative, Inc., Brgy. Maligaya, El Nido, Palawan, 5313, Philippines; Department of Biology, College of Science and Engineering, Texas Christian University, 2800 South University Drive, Fort Worth, Texas, 76109, USA
Philippine Taxonomic Initiative, Inc., Brgy. Maligaya, El Nido, Palawan, 5313, Philippines
School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
aroid endemic montane rainforest subg. Amorphophallus Thomsonieae Monocots

Abstract

A new species of Amorphophallus from Luzon Island, Philippines is here described. It is unique among Amorphophallus species in having a combination of the following characters: a ca. 1:2 peduncle to spathe ratio, a spreading and broadly triangular spathe with a deep and distinct constriction, a rugose appendix, stamens with rounded pores, and a trilobed stigma. A discussion on other closely related species is presented. We here provisionally assess this species as data deficient (DD) following IUCN guidelines pending an assessment of its populations in the wild. An identification key to Philippine species of Amorphophallus with rugose appendices is also provided.

References

  1. Beentje, H. (2016) The Kew Plant Glossary, An Illustrated Dictionary of Plant Terms (second edition). Royal Botanic Gardens Kew, Kew Publishing, 184 pp.
  2. Boyce, P.C. & Croat, T.B. (2023) The Überlist of Araceae, totals for published and estimated number of species in aroid genera. Available from: https://www.researchgate.net/publication/369741356_Uberlist_-_April_203 (accessed 17 February 2024).
  3. Bulawin, N.F., Medecilo-Guiang, M.M.P. & Alejandro, G.J.D. (2022) Amorphophallus fontarumii (Araceae), a new species from Tanay, Rizal, Luzon Island, Philippines. Nordic Journal of Botany e03643. https://doi.org/10.1111/njb.03643
  4. Bustamante, R.A.A., Mansibang, J.A., Hetterscheid, W.L.A. & Tamayo, M.N. (2020a) Amorphophallus caudatus (Thomsonieae, Araceae), a new species from Camarines Norte, Luzon island, Philippines. Nordic Journal of Botany e02982. https://doi.org/10.1111/njb.02982
  5. Bustamante, R.A.A., Tamayo, M.N. & Hetterscheid, W. (2020b) Rediscovery of a lost type: solving the mysterious identity of Amorphophallus longispathaceus Engl. & Gehrm. (Araceae). Webbia. Journal of Plant Taxonomy and Geography 75: 287–292. https://doi.org/10.36253/jopt-9446
  6. Bustamante, R.A.A., Claudel, C., Altomonte, J.C.A., Udasco, L.C. & Tamayo, M.N. (2021) Amorphophallus minimus (Araceae), a new species from the montane forest of Nueva Ecija, Luzon island, Philippines. Nordic Journal of Botany e03251. https://doi.org/10.1111/njb.03251
  7. Calaramo, M.A., Batuyong, M.A.R., Bulawin, N.F. & Alejandro, G.J.D. (2022) Notes on the genus Amorphophallus Blume ex Decne. (Araceae) of northwestern Luzon, Philippines, including a new species. Nordic Journal of Botany e03491. https://doi.org/10.1111/njb.03491
  8. Claudel, C., Buerki, S., Chatrou, L.W., Antonelli, A., Alvarez, N. & Hetterscheid, W. (2017) Large-scale phylogenetic analysis of Amorphophallus (Araceae) derived from nuclear and plastid sequences reveals new subgeneric delineation. Botanical Journal of the Linnean Society 184: 32–45. https://doi.org/10.1093/botlinnean/box013
  9. Cronquist, A. (1978) Once again, what is a species? In: Knutson, L.V. (Ed.) Biosystematics in Agriculture. Allenheld Osmin, Montclair, New Jersey, pp. 3–20.
  10. Decaisne, M.J. (1834) Description d’une herbier de l’ile de Timor. Nouvelles Annales du Museum d’Histoire Naturelle 3: 333–501.
  11. Dennstedt, A.E. (1818) Schlüssen zum Hortus Indicus Malabricus oder dreifaches Register zu diesem Werke. Verlage des Landes, Weimar, 40 pp.
  12. Engler, A. (1911) Araceae-Lasioideae. Das Pflanzenreich: Regni Vegetabilis Conspectus 48: 1–130.
  13. Hetterscheid, W.L.A. (1994) Notes on the genus Amorphophallus (Araceae)—2. New species from tropical Asia. Blumea 39: 237–281.
  14. Hetterscheid, W.L.A. & Ittenbach, S. (1996) Everything you always wanted to know about Amorphophallus, but were afraid to stick your nose into. Aroideana 19: 7–131.
  15. Hetterscheid, W.L.A., Medecilo, M.P., Callado, J.R.C. & Galloway, A. (2020) New species of Amorphophallus (Araceae) in the Philippines and an updated key. Blumea 65: 1–9. https://doi.org/10.3767/blumea.2020.65.01.01
  16. Hetterscheid, W.L.A., Wistuba, A., Amoroso, V.B., Medecilo, M.P. & Claudel, C. (2012) Amorphophallus natolii (Araceae), a new species from limestone on Palawan, Philippines. Botanical Studies 53: 415–420.
  17. IUCN Standards and Petitions Subcommittee (2024) Guidelines for using the IUCN Red List Categories and Criteria. Version 16. Available from: https://www.iucnredlist.org/documents/RedListGuidelines.pdf (accessed 20 April 2025).
  18. Magtoto, L.M., Mones, D.G., Ballada, K.A., Austria, C.M., Dizon, R.M., Alangui, W.V., Reginaldo, A.A., Galvan, W.M., Dizon, K.T. & Hetterscheid, W.L.A. (2013) Amorphophallus adamsensis (Araceae), a new species from Ilocos Norte, Philippines. Blumea 58: 267–270. https://doi.org/10.3767/000651913X676673
  19. Merrill, E.D. (1915) New or noteworthy Philippine plants, XII. Philippine Journal of Science, C. Botany 10: 289–290.
  20. Nicolson, D.H. (1977) Nomina conservanda proposita: Proposal to change the typification of 723 Amorphophallus, nom. cons. (Araceae). Taxon 26: 337–338. https://doi.org/10.2307/1220579
  21. Pelser, P.B., Barcelona, J.F. & Nickrent, D.L. (Eds.) (2011 onwards) Co’s Digital Flora of the Philippines. Available from: www.philippineplants.org (accessed 31 May 2025).
  22. Pouchon, C., Gauthier, J., Pitteloud, C., Claudel, C. & Alvarez, N. (2022) Phylogenomic study of Amorphophallus (Alismatales; Araceae): when plastid DNA gene sequences help to resolve the backbone subgeneric delineation. Journal of Systematics and Evolution 61: 64–79. https://doi.org/10.1111/jse.12910
  23. Scholten, J. (2023) An updated identification guide to the species of Amorphophallus (Araceae): new synonyms and a set of global dichotomous keys. Blumea 68: 139–161. https://doi.org/10.3767/blumea.2023.68.02.03
  24. Sedayu, A., Eurlings, M.C.M., Gravendeel, B. & Hetterscheid, W.L.A. (2010) Morphological character evolution of Amorphophallus (Araceae) based on a combined phylogenetic analysis of trnL, rbcL, and LEAFY second intron sequences. Botanical Studies 51: 473–490.
  25. Tamayo, M.N., Magtoto, L.M., Sumalinog, M.S., Reyes, T.D. & Austria, C.M. (2021) Amorphophallus calcicolus (Thomsonieae, Araceae), a new species from the Bohol island, Central Visayas, Philippines. Phytotaxa 489: 229–235. https://doi.org/10.11646/phytotaxa.489.2.12

How to Cite

Bustamante, R.A.A.B., Tamayo, M.N., Collantes, J.P. & Pelser, P.B. (2026) Amorphophallus calladoi (Araceae), a new species from Luzon Island, Philippines. Phytotaxa 740 (2): 217–222. https://doi.org/10.11646/phytotaxa.740.2.10