Abstract
Gonolobus is reassessed in the Yucatan Peninsula Biotic Province (YPBP). The genus consists of seven taxa in the area: six species and two subspecies. These include a taxon that we propose here as a new species and the treatment of G. yucatanensis as a subspecies of G. stenanthus and the new combination G. stenanthus subsp. yucatanensis is proposed. These two taxa are endemic to the YPBP. The other species are G. barbatus (for which we propose a lectotype), G. cteniophorus, G. fraternus, G. glaberrimus, and G. leianthus. The new species is G. caamalii Carnevali & R. Duno, restricted to the Yucatán state in Mexico and distinguished by its corolla lobes with a dark purple (almost black) longitudinal, callose band along the proximal 2/3 on the right side of the lobes and a 1.1–1.3 mm broad, annular, continuous dark purple-black band surrounding the gynostemium and corona at the base of the corolla lobes. It appears related to G. leianthus from southern Megamexico, a species from humid forests at higher elevations and that differs in its larger flowers with broader corolla lobes and a strikingly different color pattern in the flowers. The new species is described, illustrated, and discussed. Entries for all Gonolobus species from the YPBP include a brief discussion and specimen citations. The conservation status of the Gonolobus taxa endemic to the YPBP are assessed either as as Endangered (EN) or as Near threatened (NT). Distributional maps for all Gonolobus from the area covered are presented. Finally, we offer a key to Gonolobus of the YPBP.
References
<p>Alvarado-Cárdenas, L.O., Lozada-Pérez, L., Islas-Hernández, C.S., Cortez, E.B., Maya-Mandujano, K.G. & Chávez-Hernández, M.G. (2020a) Apocynaceae of yesterday and today. Historical knowledge and reevaluation of the diversity and distribution of Apocynaceae in Mexico. <em>Botanical Sciences</em> 98 (2): 393–416. https://doi.org/10.17129/botsci.2525</p>
<p>Alvarado-Cárdenas, L.O., Chávez-Hernández, M.G. & Pío León, M.G.F. (2020b) <em>Gonolobus naturalistae</em> (Apocynaceae; Asclepiadoideae; Gonolobeae; Gonolobinae), a New Species from México. <em>Phytotaxa</em> 472 (3): 249–258. https://doi.org/10.11646/phytotaxa.472.3.3</p>
<p>Alvarado-Cárdenas, L., Cortez, B. & Cervantes, C. (2021) <em>Gonolobus lozadae</em>, una nueva especie de Apocynaceae. <em>Botanical Sciences</em> 99 (2): 447–454. https://doi.org/10.17129/botsci.2783</p>
<p>Bachman, S., Moat, J., Hill, A.W., de Torre, J. & Scott, B. (2011) Supporting red list threat assessment with GeoCAT: Geospatial conservation assessment tool. <em>ZooKeys</em> 150: 117–126. https://doi.org/10.3897/zookeys.150.2109</p>
<p>Blake, S.F. (1917) Descriptions of new Spermatophytes, chiefly from the collections of Prof. M.E. Peck in British Honduras. <em>Contributions from the Gray Herbarium of Harvard University</em> 52: 59–106.</p>
<p>Brako, L. & Zarucchi, J.L. (1993) Catalogue of the flowering plants and Gymnosperms of Peru. <em>Monographs in Systematic Botany from the Missouri Botanical Garden</em> 45. Missouri Botanical Garden Press, St. Louis, 1286 pp.</p>
<p>Brandegee, T.S. (1924) Plantae Mexicanae Purpusianae, XII. <em>University of California Publications in Botany</em> 10 (8): 403–421.</p>
<p>Britten, J. & Baker, E.G. (1896) Notes on <em>Ceiba</em>. <em>Journal of Botany, British and Foreign</em> 34: 173–176.</p>
<p>Carnevali Fernández-Concha, G., Tapia-Muñoz, J.L., Duno de Stefano, R. & Ramírez, I.M. (Eds.) (2010) <em>Flora Ilustrada de la Península de Yucatán: Listado Florístico</em>. Centro de Investigación Científica de Yucatán, A.C., Mérida, Yucatán, 326 pp.</p>
<p>Carnevali, G. & Cetzal-Ix, W. (2015) El género <em>Gonolobus</em> (Apocynaceae, Asclepiadoideae, Gonolobinae) en la porción mexicana de la Península de Yucatán: la novedad indocumentada. <em>Desde el Herbario CICY</em> 7: 1–5.</p>
<p>Decaisne, J. (1844) Asclepiadeae.<em> In: </em>Candolle, A.P. <em>Prodromus Systematis Naturalis Regni Vegetabilis, Pars octava</em>. Sumptibus Fortin, Masson et Sociorum, Parisiis, pp. 591−665.</p>
<p>de Queiroz, K. (2007) Species concepts and species delimitation. <em>Systematic Biology</em> 56: 879–886. https://doi.org/10.1080/10635150701701083</p>
<p>de Wit, H.C.D. (1961) Typification and correct names of <em>Acacia villosa</em> Willd. and <em>Leucaena glauca</em> (L.) BTH. <em>Taxon </em>10 (2): 50–54. https://doi.org/10.2307/1217452</p>
<p>Donnell Smith, J. (1905) Undescribed plants from Guatemala and other Central American Republics XXVII. <em>Botanical Gazette</em> 40 (1): 1–11. https://doi.org/10.1086/328643</p>
<p>Donnell Smith, J. (1909) Undescribed plants from Guatemala and other Central American Republics XXXII. <em>Botanical Gazette</em> 48: 294–300. https://doi.org/10.1086/330014</p>
<p>Durán, R., Campos, G., Trejo, J.C., Simá, P., May-Pat, F. & Juan-Qui, M. (2000) <em>Listado florístico de la Península de Yucatán</em>. Centro de Investigación Científica de Yucatán, A.C., Mérida, Yucatán, México, 259 pp.</p>
<p>Edwards, S. (1817) <em>The botanical register: consisting of coloured figures of exotic plants cultivated in British gardens with their history and mode of treatment</em>. James Ridgway, London, 284 pp.</p>
<p>Flora do Brasil (2020) Jardim Botânico do Rio de Janeiro. Available from: http://floradobrasil.jbrj.gov.br/ (accessed 20 April 2021)</p>
<p>Fuentes, A. & Morales, J.F. (2014) Apocynaceae. <em>In</em>: Jørgensen, P.M., Nee, M.H. & Beck, S.G. (Eds.) <em>Catálogo de las plantas vasculares de Bolivia</em>. Monographs in Systematic Botany from the Missouri Botanical Garden 127 (1–2): i–viii. Missouri Botanical Garden Press, St. Louis. 1744 pp.</p>
<p>García, E. (2004) <em>Modificaciones al sistema de clasificación climática de Köppen</em>. Serie Libros No. 6. Instituto de Geografía, Universidad Nacional Autónoma de México, Ciudad de México, 90 pp.</p>
<p>Greenman, J.M. (1907) New or noteworthy spermatophytes from Mexico, Central America and the West Indies. <em>Publications of the Field Columbian Museum, Botanical Series</em> 2 (6): 247–287.</p>
<p>Greenman, J.M. (1912) Diagnoses of new species and notes on other Spermatophytes, chiefly from Mexico and Central America. <em>Publications of the Field Museum of Natural History, Botanical Series</em> 2 (8): 329–350.</p>
<p>Gutiérrez Báez, C. (2003) <em>Listado Florístico actualizado del Estado de Campeche, México.</em> Universidad Autónoma de Campeche. Campeche. 95 pp.</p>
<p>Hernández-Barón, G.M., Hernández-Barón, L.J. & López-Ferrari, A.R. (2021) <em>Gonolobus espejoi</em> (Apocynaceae, Asclepiadoideae), a New Species from Veracruz, Mexico. <em>Systematic Botany</em> 46 (2): 422–426. https://doi.org/10.1600/036364421X16231782047343</p>
<p>Hernández Sandoval, L., Orellana, R.A. & Carnevali, G. (2008) Two new species of <em>Manfreda</em> Salisb. (Agavaceae) from the Yucatán Peninsula, Mexico. <em>Journal of the Torrey Botanical Society</em> 135 (2): 168–177. https://doi.org/10.3159/08-RA-023.1</p>
<p>IUCN (2001) IUCN Red List Categories and Criteria, Version 3.1. IUCN, Gland, Switzerland and Cambridge. Available from: http://www.iucnredlist.org/technical-documents/categories-and-criteria/2001-categories-criteria (accessed 5 May 2018)</p>
<p>IUCN (2012) IUCN Red List Categories and Criteria: Version 3.1. Second edition. Gland, Switzerland and Cambridge. Available from: https://portals.iucn.org/library/node/10315 (accessed 5 May 2018)</p>
<p>Juárez-Jaimes, V., Alvarado-Cárdenas, L.O. & Villaseñor, J.L. (2007) La familia Apocynaceae <em>sensu lato</em> en México: diversidad y distribución. <em>Revista Mexicana de Biodiversidad</em> 78: 459–482. https://doi.org/10.22201/ib.20078706e.2007.002.402</p>
<p>Juárez-Jaimes, V., Hernández-Barón, G.M. & Stevens, W.D. (2021) Una nueva especie de <em>Matelea</em> (Apocynaceae) del Estado de Yucatán, México. <em>Novon</em> 229: 112–117. https://doi.org/10.3417/2021692</p>
<p>Krings, A. (2008) Synopsis of <em>Gonolobus s. l</em>. (Apocynaceae, Asclepiadoideae) in the United States and its territories, Including lectotypification of <em>Lachnostoma arizonicum</em>. <em>Harvard Papers in Botany</em> 13 (2): 209–218. https://doi.org/10.3100/1043-4534-13.2.209</p>
<p>Krings, A., Thomas, D.T. & Xiang, Q. (2008) On the generic circumscription of <em>Gonolobus</em> (Apocynaceae, Asclepiadoideae): Evidence from molecules and morphology. <em>Systematic Botany</em> 33: 403–415. https://doi.org/10.1600/036364408784571527</p>
<p>Krings, A. & Axelrod, F. (2013) <em>Gonolobus aloiensis</em> (Apocynaceae, Asclepiadoideae), a new species from St. Eustatius. <em>Systematic Botany</em> 38 (4): 1132–1137.</p>
<p>Kunth, K.S. (1819) <em>Gonolobus barbatus</em>. <em>In</em>: Humboldt, F.W.H.A., Bonpland, A.J.A. & Kunth, K.S (Eds.) <em>Nova Genera et Species Plantarum</em> (quarto ed.), 3. pp. 239.</p>
<p>Kunth, K.S. (1821) <em>Bombax aesculifolium</em>.<em> In: </em>Humboldt, F.W.H.A., Bonpland, A.J.A. & Kunth, K.S (Eds.) <em>Nova Genera et Species Plantarum</em> (quarto ed.), 5. pp. 298–299.</p>
<p>Kunth, K.S. (1823) <em>Robinia maculate</em>.<em> In: </em>Humboldt, F.W.H.A., Bonpland, A.J.A. & Kunth, K.S (Eds.) <em>Nova Genera et Species Plantarum</em> (quarto ed.), 6. pp. 393–395.</p>
<p>Lamarck, J.B. (1783) <em>Encyclopédie Méthodique, Botanique</em>. Panckoucke, Paris & Liège, 752 pp.</p>
<p>Lindley, J. (1821) <em>Collectanea botanica, or, Figures and botanical illustrations of rare and curious exotic plants</em>. Richard and Arthur Taylor, Shoe-Lane, London, 41 pp. https://doi.org/10.5962/bhl.title.6215.</p>
<p>Lindley, J. (1833) <em>The Genera and Species of Orchidaceous Plants</em>. Ridgways, London, 554 pp.</p>
<p>Linnaeus, C. (1753a) <em>Species plantarum II</em>. Imprensis Laurentii Salvii, Stockholm, 639 pp.</p>
<p>Linnaeus, C. (1753b) <em>Species plantarum I</em>. Imprensis Laurentii Salvii, Stockholm, 560 pp.</p>
<p>Linnaeus, C. (1759) <em>Systema Naturae II</em>. Imprensis Laurentii Salvii, Stockholm, 589 pp.</p>
<p>Linnaeus, C. (1781) Supplementum Plantarum. <em>Orphanotrophe</em>, Brunswig, 468 pp.</p>
<p>Lundell, C.L. (1942) Undescribed plants from Mexico and Central America. <em>Bulletin of the Torrey Botanical Club</em> 69 (5): 387–399. https://doi.org/10.2307/2481745</p>
<p>Lundell, C.L. (1968a) Undescribed species and notes on other plants from middle America. <em>Phytologia</em> 16 (5): 442–446.</p>
<p>Lundell, C.L. (1968b) Studies of tropical American plants IV. <em>Wrightia</em> 4 (1): 31–51.</p>
<p>McDonnell, A., Parks, M. & Fishbein, M. (2018) Multilocus Phylogenetics of New World Milkweed Vines (Apocynaceae, Asclepiadoideae, Gonolobinae). <em>Systematic Botany</em> 43: 77–96.</p>
<p>Michaux, A. (1803) <em>Flora boreali-americana: sistens caracteres plantarum quas in America septentrionali collegit et detexit Andreas Michaux. </em>Levrault, Paris, 119 pp.</p>
<p>Morales, J.F. & Stevens, W.D. (2020) Apocynaceae. <em>In</em>: Hammel, B.E., Grayum, M.H., Herrera, C. & Zamora, N. (Eds.) <em>Manual de Plantas de Costa Rica. </em>Vol. IV, Parte 1: Dicotiledóneas (Acanthaceae-Asteraceae). Monographs in Systematic Botany from the Missouri Botanical Garden 137. Missouri Botanical Garden Press. St. Louis Missouri, USA, pp. 330–447.</p>
<p>Morillo, G. (1999) Asclepiadaceae. <em>In</em>: Jørgensen, P.M. & León-Yánez, S. (Eds.) <em>Catalogue of the vascular plants of Ecuador</em>. Monographs in Systematic Botany from the Missouri Botanical Garden 75: i–viii, Missouri Botanical Garden Press, St. Louis. 1182 pp.</p>
<p>Morillo, G. (2008) Apocynaceae. <em>In</em>: Hokche, O., Berry, P.E. & Huber, O. (Eds.) <em>Nuevo catálogo de la Flora vascular de Venezuela.</em> Fundación Instituto Botánico de Venezuela, Fondo Nacional de Ciencia, Tecnología e Innovación and National Science Foundation. Caracas, Venezuela. pp. 204–212.</p>
<p>Morillo, G. (2015a) <em>Gonolobus</em> (Apocynaceae). <em>In</em>: Bernal, R., Gradstein, S.R. & Celis, M. (Eds.) <em>Catálogo de plantas y líquenes de Colombia</em>. Bogotá, Colombia: Instituto de Ciencias Naturales, Universidad Nacional de Colombia. [http://catalogoplantasdecolombia.unal.edu.co]</p>
<p>Morillo, G. (2015b) Aportes al conocimiento de las Gonolobinae Parte III (Apocynaceae, Asclepiadoideae). <em>Pittieria </em>39: 191–258.</p>
<p>Morillo, G. (2016) Nuevas especies y nuevas combinaciones en las Gonolobinae (Apocynaceae, Asclepiadoideae, Asclepiadeae) de Centro y Sudamérica. <em>Lilloa</em> 53 (1): 89–106.</p>
<p>Morton, C.V. (1944) Taxonomic studies of tropical American plants. The genus <em>Hybanthus</em> in continental America. <em>Contributions from the United States National Herbarium</em> 29: 74–82.</p>
<p>Reichenbach, H.G. (1855) Symbolae Orchidaceae. <em>Bonplandia</em> 3: 212−227.</p>
<p>Rolfe, R.A. (1901) <em>Gymnopodium floribundum</em>. <em>In</em>: <em>Hooker’s Icones plantarum</em>, 4th series 7. Dulau & co., London, pp. 2601–2700.</p>
<p>Ruiz López, H. & Pavón, J.A. (1799) <em>Flora Peruviana, et Chilensis</em>. Typis Gabrielis de Sancha, Madrid, 76 pp.</p>
<p>Rzedowski, J. (1991) Diversidad y orígenes de la flora fanerogámica de México. <em>Acta Botanica Mexicana</em> 14: 3–21.</p>
<p>Sargent, C.S. (1890) Notes on North American trees XVII. <em>Garden and Forest</em> 3 (118): 260.</p>
<p>Schlechtendal, D.F.L. (1833) De Plantis Mexicanis. <em>Linnaea</em> 8 (5): 513–528.</p>
<p>Schlechter, R. (1920) Versuch einer systematischen Neuordnung der Spiranthinae. <em>Beihefte zum Botanischen Centralblatt</em> 37 (2): 317−454.</p>
<p>Shinners, L.H. (1964) Texas Asclepiadaceae other than <em>Asclepias</em>. <em>Sida</em> 1 (6): 358–367.</p>
<p>Sosa, V., Flores, J.S., Rico-Gray, V., Lira, R. & Ortiz, J.J. (1985) Lista Florística y Sinonimia Maya. <em>In:</em> Sosa, V. (Ed.) <em>Etnoflora Yucatanense</em>. fasc. 1. Instituto Nacional de Investigaciones sobre Recursos Bióticos, Xalapa, Veracruz, 225 pp.</p>
<p>Standley, P.C. (1923) Trees and shrubs of Mexico (Oxalidaceae-Turneraceae). <em>Contributions from the United States National Herbarium</em> 23 (3): 517–848.</p>
<p>Standley, P.C. (1924) Trees and shrubs of Mexico (Passifloraceae-Scrophulariaceae). <em>Contributions from the United States National Herbarium</em> 23 (4): 849–1312.</p>
<p>Standley, P.C. (1929) Studies of American plants - I. <em>Publications of the Field Museum of Natural History, Botanical Series</em> 4 (8): 197–299.</p>
<p>Standley, P.C. (1930) Studies of American Plants–III. <em>Publications of the Field Museum of Natural History, Botanical Series</em> 8 (1): 1–74.</p>
<p>Stevens, W.D. (1983) New species and names in Apocynaceae, Asclepiadoideae. <em>Phytologia</em> 53 (6): 401–405.</p>
<p>Stevens, W.D. (2005a) Fourteen new species of <em>Gonolobus</em> (Apocynaceae, Asclepiadoideae) from México and Mesoamerica. <em>Novon</em> 15: 222–244.</p>
<p>Stevens, W.D. (2005b) New and interesting milkweeds (Apocynaceae, Asclepiadoideae). <em>Novon</em> 15: 602–619.</p>
<p>Stevens, W.D. (2010) Apocynaceae: <em>Gonolobus</em>. <em>In</em>: Davidse, G., Sousa, M., Knapp, S. & Chiang, F. (Eds.) <em>Flora Mesoamericana</em>, Vol 4, parte 1. Universidad Nacional Autónoma de México, Missouri Botanical Garden, The Natural History Museum (London), pp. 733–741.</p>
<p>Steyermark, J.A. (1978) New taxa from the Avila and Naiguatá Mountains, Venezuela. <em>Brittonia</em> 30 (1): 39–49. https://doi.org/10.2307/2806455</p>
<p>Thiede, J. (2012) Nomenclatural transfers from <em>Manfreda</em> Salisb., <em>Polianthes</em> L. and <em>Bravoa</em> Lex. to <em>Agave</em> L. (Agavaceae/Asparagaceae). <em>Haseltonia</em> (17): 94–95. https://doi.org/10.2985/1070-0048-17.1.12</p>
<p>Thiers, B. (2018 [continuously updated]) Index Herbariorum: A global directory of public herbaria and associated staff. New York Botanical Garden’s Virtual Herbarium. http://sweetgum.nybg.org/science/ih/ (accessed on 19 March 2021)</p>
<p>Trejo-Torres, J.C., Hayden, W.J, Pasos-Enríquez, R.M., Carvajal-Mejía, L.A. & Callaghan, J.M. (2014) <em>Catálogo de la Flora de Kaxil Kiuic</em>. Reporte final del proyecto “Difusión Ambiental en la Reserva Biocultural Estatal Puuc”. Kaxil Kiuic A.C. & Programa de Pequeñas Donaciones – FMAM-México – PNUD, Mérida, Yucatán, 72 pp.</p>
<p>Turland, N.J., Wiersema, J.H., Barrie, F.R., Greuter, W., Hawkswoth, D.L., Herendeen, P.S., Knapp, S., Kusber, W.H., Li, D.-Z., Marhol, K., May, T.W., McNeill, J., Monro, A.M., Prado, J., Price, M.J. & Smith, G.F. (2018) <em>International Code of Nomenclature for algae, fungi and plants (Shenzhen code). Regnum Vegetabile</em> 159. Königstein: Koeltz Scientific Books.</p>
<p>Villaseñor, J.L. (2016) Checklist of the native vascular plants of Mexico. <em>Revista Mexicana de Biodiversidad</em> 87: 559–902. http://dx.doi.org/10.1016/j.rmb.2016.06.017</p>
<p>Walpers, W.G. (1842) <em>Repertorium Botanices Systematicae</em> <em>1</em>. Sumtibus Friderici Hofmeister, Leipzig, 947 pp.</p>
<p>Woodson, Jr., R.E. (1932) New or Otherwise Noteworthy Apocynaceae of Tropical America. II. <em>Annals of the Missouri Botanical Garden </em>19 (1): 45–76. https://doi.org/10.2307/2394172</p>
<p>Woodson, Jr., R.E. (1935) New Apocynaceae and Asclepiadaceae. <em>American Journal of Botany</em> 22 (7): 684–693. https://doi.org/10.2307/2436223.</p>
<p>Woodson, R.E. (1941a) The North American Asclepiadaceae. I. Perspective of the genera. <em>Annals of the Missouri Botanical Garden</em> 28: 193–244. https://doi.org/10.2307/2394270</p>
<p>Woodson, Jr., R.E. (1941b) Miscellaneous New Asclepiadaceae and Apocynaceae from Tropical America. <em>Annals of the Missouri Botanical Garden</em> 28 (3): 271–286. https://doi.org/10.2307/2394350</p>
<p>Woodson Jr., R.E., Schery, R.W. & Nowicke, J.W. (1970) Flora of Panama. Part VIII. Family 162. Apocynaceae. <em>Annals of the Missouri Botanical Garden</em> 57 (1): 59–130.</p>
<p>Alvarado-Cárdenas, L.O., Chávez-Hernández, M.G. & Pío León, M.G.F. (2020b) <em>Gonolobus naturalistae</em> (Apocynaceae; Asclepiadoideae; Gonolobeae; Gonolobinae), a New Species from México. <em>Phytotaxa</em> 472 (3): 249–258. https://doi.org/10.11646/phytotaxa.472.3.3</p>
<p>Alvarado-Cárdenas, L., Cortez, B. & Cervantes, C. (2021) <em>Gonolobus lozadae</em>, una nueva especie de Apocynaceae. <em>Botanical Sciences</em> 99 (2): 447–454. https://doi.org/10.17129/botsci.2783</p>
<p>Bachman, S., Moat, J., Hill, A.W., de Torre, J. & Scott, B. (2011) Supporting red list threat assessment with GeoCAT: Geospatial conservation assessment tool. <em>ZooKeys</em> 150: 117–126. https://doi.org/10.3897/zookeys.150.2109</p>
<p>Blake, S.F. (1917) Descriptions of new Spermatophytes, chiefly from the collections of Prof. M.E. Peck in British Honduras. <em>Contributions from the Gray Herbarium of Harvard University</em> 52: 59–106.</p>
<p>Brako, L. & Zarucchi, J.L. (1993) Catalogue of the flowering plants and Gymnosperms of Peru. <em>Monographs in Systematic Botany from the Missouri Botanical Garden</em> 45. Missouri Botanical Garden Press, St. Louis, 1286 pp.</p>
<p>Brandegee, T.S. (1924) Plantae Mexicanae Purpusianae, XII. <em>University of California Publications in Botany</em> 10 (8): 403–421.</p>
<p>Britten, J. & Baker, E.G. (1896) Notes on <em>Ceiba</em>. <em>Journal of Botany, British and Foreign</em> 34: 173–176.</p>
<p>Carnevali Fernández-Concha, G., Tapia-Muñoz, J.L., Duno de Stefano, R. & Ramírez, I.M. (Eds.) (2010) <em>Flora Ilustrada de la Península de Yucatán: Listado Florístico</em>. Centro de Investigación Científica de Yucatán, A.C., Mérida, Yucatán, 326 pp.</p>
<p>Carnevali, G. & Cetzal-Ix, W. (2015) El género <em>Gonolobus</em> (Apocynaceae, Asclepiadoideae, Gonolobinae) en la porción mexicana de la Península de Yucatán: la novedad indocumentada. <em>Desde el Herbario CICY</em> 7: 1–5.</p>
<p>Decaisne, J. (1844) Asclepiadeae.<em> In: </em>Candolle, A.P. <em>Prodromus Systematis Naturalis Regni Vegetabilis, Pars octava</em>. Sumptibus Fortin, Masson et Sociorum, Parisiis, pp. 591−665.</p>
<p>de Queiroz, K. (2007) Species concepts and species delimitation. <em>Systematic Biology</em> 56: 879–886. https://doi.org/10.1080/10635150701701083</p>
<p>de Wit, H.C.D. (1961) Typification and correct names of <em>Acacia villosa</em> Willd. and <em>Leucaena glauca</em> (L.) BTH. <em>Taxon </em>10 (2): 50–54. https://doi.org/10.2307/1217452</p>
<p>Donnell Smith, J. (1905) Undescribed plants from Guatemala and other Central American Republics XXVII. <em>Botanical Gazette</em> 40 (1): 1–11. https://doi.org/10.1086/328643</p>
<p>Donnell Smith, J. (1909) Undescribed plants from Guatemala and other Central American Republics XXXII. <em>Botanical Gazette</em> 48: 294–300. https://doi.org/10.1086/330014</p>
<p>Durán, R., Campos, G., Trejo, J.C., Simá, P., May-Pat, F. & Juan-Qui, M. (2000) <em>Listado florístico de la Península de Yucatán</em>. Centro de Investigación Científica de Yucatán, A.C., Mérida, Yucatán, México, 259 pp.</p>
<p>Edwards, S. (1817) <em>The botanical register: consisting of coloured figures of exotic plants cultivated in British gardens with their history and mode of treatment</em>. James Ridgway, London, 284 pp.</p>
<p>Flora do Brasil (2020) Jardim Botânico do Rio de Janeiro. Available from: http://floradobrasil.jbrj.gov.br/ (accessed 20 April 2021)</p>
<p>Fuentes, A. & Morales, J.F. (2014) Apocynaceae. <em>In</em>: Jørgensen, P.M., Nee, M.H. & Beck, S.G. (Eds.) <em>Catálogo de las plantas vasculares de Bolivia</em>. Monographs in Systematic Botany from the Missouri Botanical Garden 127 (1–2): i–viii. Missouri Botanical Garden Press, St. Louis. 1744 pp.</p>
<p>García, E. (2004) <em>Modificaciones al sistema de clasificación climática de Köppen</em>. Serie Libros No. 6. Instituto de Geografía, Universidad Nacional Autónoma de México, Ciudad de México, 90 pp.</p>
<p>Greenman, J.M. (1907) New or noteworthy spermatophytes from Mexico, Central America and the West Indies. <em>Publications of the Field Columbian Museum, Botanical Series</em> 2 (6): 247–287.</p>
<p>Greenman, J.M. (1912) Diagnoses of new species and notes on other Spermatophytes, chiefly from Mexico and Central America. <em>Publications of the Field Museum of Natural History, Botanical Series</em> 2 (8): 329–350.</p>
<p>Gutiérrez Báez, C. (2003) <em>Listado Florístico actualizado del Estado de Campeche, México.</em> Universidad Autónoma de Campeche. Campeche. 95 pp.</p>
<p>Hernández-Barón, G.M., Hernández-Barón, L.J. & López-Ferrari, A.R. (2021) <em>Gonolobus espejoi</em> (Apocynaceae, Asclepiadoideae), a New Species from Veracruz, Mexico. <em>Systematic Botany</em> 46 (2): 422–426. https://doi.org/10.1600/036364421X16231782047343</p>
<p>Hernández Sandoval, L., Orellana, R.A. & Carnevali, G. (2008) Two new species of <em>Manfreda</em> Salisb. (Agavaceae) from the Yucatán Peninsula, Mexico. <em>Journal of the Torrey Botanical Society</em> 135 (2): 168–177. https://doi.org/10.3159/08-RA-023.1</p>
<p>IUCN (2001) IUCN Red List Categories and Criteria, Version 3.1. IUCN, Gland, Switzerland and Cambridge. Available from: http://www.iucnredlist.org/technical-documents/categories-and-criteria/2001-categories-criteria (accessed 5 May 2018)</p>
<p>IUCN (2012) IUCN Red List Categories and Criteria: Version 3.1. Second edition. Gland, Switzerland and Cambridge. Available from: https://portals.iucn.org/library/node/10315 (accessed 5 May 2018)</p>
<p>Juárez-Jaimes, V., Alvarado-Cárdenas, L.O. & Villaseñor, J.L. (2007) La familia Apocynaceae <em>sensu lato</em> en México: diversidad y distribución. <em>Revista Mexicana de Biodiversidad</em> 78: 459–482. https://doi.org/10.22201/ib.20078706e.2007.002.402</p>
<p>Juárez-Jaimes, V., Hernández-Barón, G.M. & Stevens, W.D. (2021) Una nueva especie de <em>Matelea</em> (Apocynaceae) del Estado de Yucatán, México. <em>Novon</em> 229: 112–117. https://doi.org/10.3417/2021692</p>
<p>Krings, A. (2008) Synopsis of <em>Gonolobus s. l</em>. (Apocynaceae, Asclepiadoideae) in the United States and its territories, Including lectotypification of <em>Lachnostoma arizonicum</em>. <em>Harvard Papers in Botany</em> 13 (2): 209–218. https://doi.org/10.3100/1043-4534-13.2.209</p>
<p>Krings, A., Thomas, D.T. & Xiang, Q. (2008) On the generic circumscription of <em>Gonolobus</em> (Apocynaceae, Asclepiadoideae): Evidence from molecules and morphology. <em>Systematic Botany</em> 33: 403–415. https://doi.org/10.1600/036364408784571527</p>
<p>Krings, A. & Axelrod, F. (2013) <em>Gonolobus aloiensis</em> (Apocynaceae, Asclepiadoideae), a new species from St. Eustatius. <em>Systematic Botany</em> 38 (4): 1132–1137.</p>
<p>Kunth, K.S. (1819) <em>Gonolobus barbatus</em>. <em>In</em>: Humboldt, F.W.H.A., Bonpland, A.J.A. & Kunth, K.S (Eds.) <em>Nova Genera et Species Plantarum</em> (quarto ed.), 3. pp. 239.</p>
<p>Kunth, K.S. (1821) <em>Bombax aesculifolium</em>.<em> In: </em>Humboldt, F.W.H.A., Bonpland, A.J.A. & Kunth, K.S (Eds.) <em>Nova Genera et Species Plantarum</em> (quarto ed.), 5. pp. 298–299.</p>
<p>Kunth, K.S. (1823) <em>Robinia maculate</em>.<em> In: </em>Humboldt, F.W.H.A., Bonpland, A.J.A. & Kunth, K.S (Eds.) <em>Nova Genera et Species Plantarum</em> (quarto ed.), 6. pp. 393–395.</p>
<p>Lamarck, J.B. (1783) <em>Encyclopédie Méthodique, Botanique</em>. Panckoucke, Paris & Liège, 752 pp.</p>
<p>Lindley, J. (1821) <em>Collectanea botanica, or, Figures and botanical illustrations of rare and curious exotic plants</em>. Richard and Arthur Taylor, Shoe-Lane, London, 41 pp. https://doi.org/10.5962/bhl.title.6215.</p>
<p>Lindley, J. (1833) <em>The Genera and Species of Orchidaceous Plants</em>. Ridgways, London, 554 pp.</p>
<p>Linnaeus, C. (1753a) <em>Species plantarum II</em>. Imprensis Laurentii Salvii, Stockholm, 639 pp.</p>
<p>Linnaeus, C. (1753b) <em>Species plantarum I</em>. Imprensis Laurentii Salvii, Stockholm, 560 pp.</p>
<p>Linnaeus, C. (1759) <em>Systema Naturae II</em>. Imprensis Laurentii Salvii, Stockholm, 589 pp.</p>
<p>Linnaeus, C. (1781) Supplementum Plantarum. <em>Orphanotrophe</em>, Brunswig, 468 pp.</p>
<p>Lundell, C.L. (1942) Undescribed plants from Mexico and Central America. <em>Bulletin of the Torrey Botanical Club</em> 69 (5): 387–399. https://doi.org/10.2307/2481745</p>
<p>Lundell, C.L. (1968a) Undescribed species and notes on other plants from middle America. <em>Phytologia</em> 16 (5): 442–446.</p>
<p>Lundell, C.L. (1968b) Studies of tropical American plants IV. <em>Wrightia</em> 4 (1): 31–51.</p>
<p>McDonnell, A., Parks, M. & Fishbein, M. (2018) Multilocus Phylogenetics of New World Milkweed Vines (Apocynaceae, Asclepiadoideae, Gonolobinae). <em>Systematic Botany</em> 43: 77–96.</p>
<p>Michaux, A. (1803) <em>Flora boreali-americana: sistens caracteres plantarum quas in America septentrionali collegit et detexit Andreas Michaux. </em>Levrault, Paris, 119 pp.</p>
<p>Morales, J.F. & Stevens, W.D. (2020) Apocynaceae. <em>In</em>: Hammel, B.E., Grayum, M.H., Herrera, C. & Zamora, N. (Eds.) <em>Manual de Plantas de Costa Rica. </em>Vol. IV, Parte 1: Dicotiledóneas (Acanthaceae-Asteraceae). Monographs in Systematic Botany from the Missouri Botanical Garden 137. Missouri Botanical Garden Press. St. Louis Missouri, USA, pp. 330–447.</p>
<p>Morillo, G. (1999) Asclepiadaceae. <em>In</em>: Jørgensen, P.M. & León-Yánez, S. (Eds.) <em>Catalogue of the vascular plants of Ecuador</em>. Monographs in Systematic Botany from the Missouri Botanical Garden 75: i–viii, Missouri Botanical Garden Press, St. Louis. 1182 pp.</p>
<p>Morillo, G. (2008) Apocynaceae. <em>In</em>: Hokche, O., Berry, P.E. & Huber, O. (Eds.) <em>Nuevo catálogo de la Flora vascular de Venezuela.</em> Fundación Instituto Botánico de Venezuela, Fondo Nacional de Ciencia, Tecnología e Innovación and National Science Foundation. Caracas, Venezuela. pp. 204–212.</p>
<p>Morillo, G. (2015a) <em>Gonolobus</em> (Apocynaceae). <em>In</em>: Bernal, R., Gradstein, S.R. & Celis, M. (Eds.) <em>Catálogo de plantas y líquenes de Colombia</em>. Bogotá, Colombia: Instituto de Ciencias Naturales, Universidad Nacional de Colombia. [http://catalogoplantasdecolombia.unal.edu.co]</p>
<p>Morillo, G. (2015b) Aportes al conocimiento de las Gonolobinae Parte III (Apocynaceae, Asclepiadoideae). <em>Pittieria </em>39: 191–258.</p>
<p>Morillo, G. (2016) Nuevas especies y nuevas combinaciones en las Gonolobinae (Apocynaceae, Asclepiadoideae, Asclepiadeae) de Centro y Sudamérica. <em>Lilloa</em> 53 (1): 89–106.</p>
<p>Morton, C.V. (1944) Taxonomic studies of tropical American plants. The genus <em>Hybanthus</em> in continental America. <em>Contributions from the United States National Herbarium</em> 29: 74–82.</p>
<p>Reichenbach, H.G. (1855) Symbolae Orchidaceae. <em>Bonplandia</em> 3: 212−227.</p>
<p>Rolfe, R.A. (1901) <em>Gymnopodium floribundum</em>. <em>In</em>: <em>Hooker’s Icones plantarum</em>, 4th series 7. Dulau & co., London, pp. 2601–2700.</p>
<p>Ruiz López, H. & Pavón, J.A. (1799) <em>Flora Peruviana, et Chilensis</em>. Typis Gabrielis de Sancha, Madrid, 76 pp.</p>
<p>Rzedowski, J. (1991) Diversidad y orígenes de la flora fanerogámica de México. <em>Acta Botanica Mexicana</em> 14: 3–21.</p>
<p>Sargent, C.S. (1890) Notes on North American trees XVII. <em>Garden and Forest</em> 3 (118): 260.</p>
<p>Schlechtendal, D.F.L. (1833) De Plantis Mexicanis. <em>Linnaea</em> 8 (5): 513–528.</p>
<p>Schlechter, R. (1920) Versuch einer systematischen Neuordnung der Spiranthinae. <em>Beihefte zum Botanischen Centralblatt</em> 37 (2): 317−454.</p>
<p>Shinners, L.H. (1964) Texas Asclepiadaceae other than <em>Asclepias</em>. <em>Sida</em> 1 (6): 358–367.</p>
<p>Sosa, V., Flores, J.S., Rico-Gray, V., Lira, R. & Ortiz, J.J. (1985) Lista Florística y Sinonimia Maya. <em>In:</em> Sosa, V. (Ed.) <em>Etnoflora Yucatanense</em>. fasc. 1. Instituto Nacional de Investigaciones sobre Recursos Bióticos, Xalapa, Veracruz, 225 pp.</p>
<p>Standley, P.C. (1923) Trees and shrubs of Mexico (Oxalidaceae-Turneraceae). <em>Contributions from the United States National Herbarium</em> 23 (3): 517–848.</p>
<p>Standley, P.C. (1924) Trees and shrubs of Mexico (Passifloraceae-Scrophulariaceae). <em>Contributions from the United States National Herbarium</em> 23 (4): 849–1312.</p>
<p>Standley, P.C. (1929) Studies of American plants - I. <em>Publications of the Field Museum of Natural History, Botanical Series</em> 4 (8): 197–299.</p>
<p>Standley, P.C. (1930) Studies of American Plants–III. <em>Publications of the Field Museum of Natural History, Botanical Series</em> 8 (1): 1–74.</p>
<p>Stevens, W.D. (1983) New species and names in Apocynaceae, Asclepiadoideae. <em>Phytologia</em> 53 (6): 401–405.</p>
<p>Stevens, W.D. (2005a) Fourteen new species of <em>Gonolobus</em> (Apocynaceae, Asclepiadoideae) from México and Mesoamerica. <em>Novon</em> 15: 222–244.</p>
<p>Stevens, W.D. (2005b) New and interesting milkweeds (Apocynaceae, Asclepiadoideae). <em>Novon</em> 15: 602–619.</p>
<p>Stevens, W.D. (2010) Apocynaceae: <em>Gonolobus</em>. <em>In</em>: Davidse, G., Sousa, M., Knapp, S. & Chiang, F. (Eds.) <em>Flora Mesoamericana</em>, Vol 4, parte 1. Universidad Nacional Autónoma de México, Missouri Botanical Garden, The Natural History Museum (London), pp. 733–741.</p>
<p>Steyermark, J.A. (1978) New taxa from the Avila and Naiguatá Mountains, Venezuela. <em>Brittonia</em> 30 (1): 39–49. https://doi.org/10.2307/2806455</p>
<p>Thiede, J. (2012) Nomenclatural transfers from <em>Manfreda</em> Salisb., <em>Polianthes</em> L. and <em>Bravoa</em> Lex. to <em>Agave</em> L. (Agavaceae/Asparagaceae). <em>Haseltonia</em> (17): 94–95. https://doi.org/10.2985/1070-0048-17.1.12</p>
<p>Thiers, B. (2018 [continuously updated]) Index Herbariorum: A global directory of public herbaria and associated staff. New York Botanical Garden’s Virtual Herbarium. http://sweetgum.nybg.org/science/ih/ (accessed on 19 March 2021)</p>
<p>Trejo-Torres, J.C., Hayden, W.J, Pasos-Enríquez, R.M., Carvajal-Mejía, L.A. & Callaghan, J.M. (2014) <em>Catálogo de la Flora de Kaxil Kiuic</em>. Reporte final del proyecto “Difusión Ambiental en la Reserva Biocultural Estatal Puuc”. Kaxil Kiuic A.C. & Programa de Pequeñas Donaciones – FMAM-México – PNUD, Mérida, Yucatán, 72 pp.</p>
<p>Turland, N.J., Wiersema, J.H., Barrie, F.R., Greuter, W., Hawkswoth, D.L., Herendeen, P.S., Knapp, S., Kusber, W.H., Li, D.-Z., Marhol, K., May, T.W., McNeill, J., Monro, A.M., Prado, J., Price, M.J. & Smith, G.F. (2018) <em>International Code of Nomenclature for algae, fungi and plants (Shenzhen code). Regnum Vegetabile</em> 159. Königstein: Koeltz Scientific Books.</p>
<p>Villaseñor, J.L. (2016) Checklist of the native vascular plants of Mexico. <em>Revista Mexicana de Biodiversidad</em> 87: 559–902. http://dx.doi.org/10.1016/j.rmb.2016.06.017</p>
<p>Walpers, W.G. (1842) <em>Repertorium Botanices Systematicae</em> <em>1</em>. Sumtibus Friderici Hofmeister, Leipzig, 947 pp.</p>
<p>Woodson, Jr., R.E. (1932) New or Otherwise Noteworthy Apocynaceae of Tropical America. II. <em>Annals of the Missouri Botanical Garden </em>19 (1): 45–76. https://doi.org/10.2307/2394172</p>
<p>Woodson, Jr., R.E. (1935) New Apocynaceae and Asclepiadaceae. <em>American Journal of Botany</em> 22 (7): 684–693. https://doi.org/10.2307/2436223.</p>
<p>Woodson, R.E. (1941a) The North American Asclepiadaceae. I. Perspective of the genera. <em>Annals of the Missouri Botanical Garden</em> 28: 193–244. https://doi.org/10.2307/2394270</p>
<p>Woodson, Jr., R.E. (1941b) Miscellaneous New Asclepiadaceae and Apocynaceae from Tropical America. <em>Annals of the Missouri Botanical Garden</em> 28 (3): 271–286. https://doi.org/10.2307/2394350</p>
<p>Woodson Jr., R.E., Schery, R.W. & Nowicke, J.W. (1970) Flora of Panama. Part VIII. Family 162. Apocynaceae. <em>Annals of the Missouri Botanical Garden</em> 57 (1): 59–130.</p>