Abstract
Agave igni (sect. Littaea, Agavaceae, Asparagales), a new species, is described and illustrated. It is endemic to the Río Armería watershed, between the calcareous Cerro Grande massif, eastern Sierra de Manantlán and the lower igneous slopes of Nevado de Colima, Jalisco, Mexico. Morphologically, it resembles A. colimana, from which it is distinguished by its less numerous leaves per full-size rosette, arched inflorescences vs. mostly straight, shorter ovary length, shorter tepals, shorter fruits, and longer phenological (flowering/fruiting) periods. A distribution map is provided involving only morphologically close species of Agave sect. Littaea in western Mexico, featuring biogeographic provinces.
References
- Bachman, S., Moat, J., Hill, A.W., de la Torre, J. & Scott, B. (2011) Supporting Red List threat assessments with GeoCAT: Geospatial Conservation Assessment Tool. ZooKeys 150: 111–126. https://doi.org/10.3897/zookeys.150.2109
- Baker, J.G. (1877) The genus Agave. The Gardeners’ Chronicle, new series 8: 40–41, 137, 200–202.
- Bentham, J. & Hooker, J.D. (1883) Genera Plantarum, vol. 3. Sistens monochlamidearum, gymnospermearum et monocotyledonum ordines LXXIII. L. Reeve & Co., London, 1258 pp.
- Berger, A. (1913) Repertorium specierum novarum regni vegetabilis, vol. 12. Selbstverlag des Herausgebers, Berlin, 580 pp.
- Cházaro-Basáñez, M., Valencia-Pelayo, O., Lomelí-Sención, J.A. & Vargas-Rodríguez, Y.L. (2006) Agave vazquezgarciae (Agavaceae), a new species from Jalisco, México. Novon: A Journal for Botanical Nomenclature 16: 458–461. https://doi.org/10.3417/1055-3177(2006)16[458:AVAANS]2.0.CO;2
- Cronquist, A. (1978) Once again, what is a species? In: Knutson, L.V. (Ed.) Biosystematics in Agriculture. Allenheld Osmin, Montclair, pp. 3–20.
- Cuevas-Guzmán, R., Santana-Michel, F.J. & Balcazar-Medina, O. (2012) Agave manantlanicola (Agavaceae), a new species from western Mexico. Brittonia 64: 330–335. https://doi.org/10.1007/s12228-012-9240-6
- Gentry, H.S. (1968) Agave geminiflora and Agave colimana sp. nov. Cactus & Succulent Journal 40: 208–213.
- Gentry, H.S. (1972) The Agave family in Sonora. United States Department of Agriculture, Washington D.C., 195 pp.
- Gentry, H.S. (1982) Agaves of Continental North America. The University of Arizona Press, Tucson, Arizona, 670 pp. https://doi.org/10.2307/j.ctv1t4m2h4
- Givnish, T.J. (2010) Ecology of plant speciation. Taxon 59: 1326–1366. https://doi.org/10.1002/tax.595003
- Govaerts, R.H.A. (comp.) (2014+) World checklist of selected plant families [continuously updated]. Richmond (GB): Trustees of the Royal Botanic Gardens, Kew. Available from: http://apps.kew.org/wcsp (accessed 12 May 2025)
- Haworth, A.H. (1812) Synopsis plantarum succulentarum. Typis R. Taylor et Socii, London, 207 pp.
- Hernández-Vera, G., Cházaro-Basáñez, M. & Flores-Berrios, E. (2007a) Inventory and distribution of Agave (Agavaceae) species in Jalisco, Mexico. Journal of the Botanical Research Institute of Texas 1: 499–509. https://www.jstor.org/stable/41971446
- Hernández-Vera, G., Cházaro-Basáñez, M. & Flores-Berrios, E. (2007b) Inventario, distribución y hábitat del género Agave (Agavaceae) en Jalisco, México. In: Vázquez-García, J.A., Cházaro-Basáñez, M., Hernández-Vera, G., Flores-Berrios, E. & Vargas-Rodríguez, Y.L. (Eds.) Agaves del Occidente de México. Serie Fronteras de Biodiversidad 3. Universidad de Guadalajara-Consejo Regulador del Tequila AC-CIATEJ AC-CONAFOR, México, pp. 6–12.
- IUCN (2022) Guidelines for Using the IUCN Red List Categories and Criteria. Version 15.1. Prepared by the Standards and Petitions Committee. Available from: https://www.iucnredlist.org/documents/RedListGuidelines.pdf (accessed 20 June 2023)
- Koch, K. (1860) Wochenscrift des Vereines zur Befördung des Gärtenbaues in den Königl. Preussischen Staaten für Gärtnerei und Pflanzenkunde 3: 28.
- Lemaire, C. (1861) Agave schidigera. L’illustration horticole 8: verso pl. 289.
- Linnaeus, C. (1753) Species Plantarum 1. Impensis Laurentii Salvii, Holmiae, 560 pp. https://doi.org/10.5962/bhl.title.669
- Liou, L.W. & Price, T.D. (1994) Speciation by reinforcement of premating isolation. Evolution 48: 1451–1459. https://doi.org/10.1111/j.1558-5646.1994.tb02187.x
- Morrone, J.J. (2017) Biogeographic regionalization of the Sierra Madre del Sur province, Mexico. Revista Mexicana de Biodiversidad 88: 710–714. https://doi.org/10.1016/j.rmb.2017.07.012
- Morrone, J.J., Escalante, T. & Rodríguez-Tapia, G. (2017) Mexican biogeographic provinces: Map and shapefiles. Zootaxa 4277: 277–279. https://doi.org/10.11646/zootaxa.4277.2.8
- NaturaLista (2022a) Agave colimana. Comisión Nacional para el Conocimiento y Uso de la Biodiversidad, Mexico City. Available from: https://www.inaturalist.org/taxa/290817-Agave-colimana (accessed 27 June 2022)
- NaturaLista (2022b) Agave schidigera. Comisión Nacional para el Conocimiento y Uso de la Biodiversidad, Mexico City. Available from: https://www.inaturalist.org/photos/231230912 (accessed 27 June 2022)
- Salm-Reifferscheidt-Dyck, J. (1834) Hortus dyckensis: ou catalogue des plantes cultivées dans les jardins de Dyck (Vol. 1). Arnz. [https://www.biodiversitylibrary.org/page/49118362]
- Shorthouse, D.P. (2010) SimpleMappr, an online tool to produce publication-quality point maps. Available from: http://www.simplemappr.net (accessed 2 June 2023)
- Slatkin, M. (1973) Gene flow and selection in a cline. Genetics 75: 733–756. https://doi.org/10.1093/genetics/75.4.733
- Slatkin, M. (1985) Gene flow in natural populations. Annual Review of Ecology and Systematics 16: 393–430. https://doi.org/10.1146/annurev.es.16.110185.002141
- Starr, G. (2012) Agaves. Living sculptures for landscapes and containers. Portland (US)/London (GB): Timber Press, 342 pp.
- Standley, P.C. (1920) Trees and shrubs of Mexico. Contributions from the United States National Herbarium (Vol. 23), US Government Printing Office, 1721 pp. https://doi.org/10.5962/bhl.title.15726
- Tagliabue, G. (1816) Storia e descrizione del nuovo genere di Pianta denominato Littaea. Biblioteca Italiana ossia giornale di letteratura scienze ed arti 1: 100–110.
- Thiede, J. (2020) Agave. In: Eggli, U. & Nyffeler, R. (Eds.) Illustrated handbook of succulent plants: Monocotyledons. Springer, Berlin, pp. 97–311. https://doi.org/10.1007/978-3-662-56486-8_111
- Trelease, W. (1920) Amaryllidaceae. In: Standley, P.C. (Ed.) Trees and shrubs of Mexico. Contributions from the United States National Herbarium 23: 105–142.
- Ullrich, B. (1992) On the discovery of Agave schidigera Lemaire and status of certain taxa of section Xysmagave Berger. British Cactus & Succulent Journal 10: 61–70.
- Vázquez-García, J.A., Cuevas-Guzmán, R., Cochrane, T.S., Iltis, H.H., Santana-Michel, F.J. & Guzmán-Hernández, L. (1995) Flora de Manantlán. BRIT Press, Fort Worth, Texas, 312 pp.
- Vázquez-García, J.A., Padilla-Lepe, J., Rosales-Martínez, C.S., Faurrieta-Cruz, Á., Nuño-Rubio, A.T., Campos-Cordero, L., Nieves-Hernández, G., Acosta-Nungaray, A.A., De La Cruz-Pérez, E.E., Berni-Huerta, F., Durán-Gómez, H.D., Prinz, A., Pérez-González, R.E. & Chavarín-González, R.A. (2023a) Tres especies nuevas de México, Agave cualensis, A. marcelinoi y A. sororum: Radiación adaptativa subyacente al complejo Agave schidigera y a la sección Littaea (Asparagaceae). Boletín Nakari 34: 1–30.
- Vázquez-García, J.A., Rojas-Aguilar, E.I., González-Bernal, M.A., Carrillo-García, J.A. & Rosales-Martínez, C.S. (2023b) Agave mayo (sect. Littaea, Asparagaceae), a new species from northern Sinaloa, Mexico. Phytotaxa 616: 99–106. https://doi.org/10.11646/phytotaxa.616.1.8
- Vázquez-García, J.A., Cházaro-Basáñez, M.J., Hernández-Vera, G., Flores-Berrios, E. & Vargas-Rodríguez, Y.L. (2007a) Agaves del Occidente de México. Serie Fronteras de Biodiversidad 3. Universidad de Guadalajara-CUCBA-Consejo Regulador del Tequila AC-CIATEJ AC-CONAFOR, México, 221 pp.
- Vázquez-García, J.A., Cházaro-Basáñez, M.J., Hernández-Vera, G., Vargas-Rodríguez, Y.L. & Zamora T., M.P. (2007b) Taxonomía del género Agave en el occidente de México: Un panorámica preliminar. In: Vázquez-García, J.A. & al. (eds.) Agaves del Occidente de México. Guadalajara (MX): Universidad de Guadalajara, pp. 38–82.
- Watson, S. (1890) Contributions to American Botany. Proceedings of the American Academy of Arts and Sciences 25: 124–163. https://doi.org/10.2307/20020431