Magnolia zotictla (Magnolia sect. Macrophylla, Magnoliaceae): a new species from the southern Sierra Madre Oriental, México Author Sánchez-González, Arturo 0000-0002-3190-8789 Universidad Autónoma del Estado de Hidalgo, Centro de Investigaciones Biológicas, Ciudad del Conocimiento, km. 4.5 carr. Pachuca- Tulancingo, Mineral de la Reforma, Hidalgo, 42184, México & arturosg @ uaeh. edu. mx; https: // orcid. org / 0000 - 0002 - 3190 - 8789 arturosg@uaeh.edu.mx Author Gutiérrez-Lozano, Marisol 0000-0002-4567-9761 Universidad Autónoma del Estado de Hidalgo, Centro de Investigaciones Biológicas, Ciudad del Conocimiento, km. 4.5 carr. Pachuca- Tulancingo, Mineral de la Reforma, Hidalgo, 42184, México & marisolbiology @ gmail. com; https: // orcid. org / 0000 - 0002 - 4567 - 9761 marisolbiology@gmail.com Author Yescas, Reyna Domínguez 0000-0002-4169-6871 Herbario IBUG, Instituto de Botánica, Departamento de Botánica y Zoología, Centro Universitario de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara, km. 15.5 carr. Guadalajara-Nogales, Las Agujas, Zapopan, Jalisco, 45221, México & reyna. dominguezy @ gmail. com; https: // orcid. org / 0000 - 0002 - 4169 - 6871 reyna.dominguezy@gmail.com Author Hernández-Álvarez, Adriana Gisela 0000-0002-9241-8513 Universidad Autónoma del Estado de Hidalgo, Centro de Investigaciones Biológicas, Ciudad del Conocimiento, km. 4.5 carr. Pachuca- Tulancingo, Mineral de la Reforma, Hidalgo, 42184, México & xokokana @ gmail. com; https: // orcid. org / 0000 - 0002 - 9241 - 8513 xokokana@gmail.com Author Ortega-Peña, A. Salomé 0000-0002-3297-8316 Herbario IBUG, Instituto de Botánica, Departamento de Botánica y Zoología, Centro Universitario de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara, km. 15.5 carr. Guadalajara-Nogales, Las Agujas, Zapopan, Jalisco, 45221, México & 4.08. ortega. alondra. 210696 @ gmail. com; https: // orcid. org / 0000 - 0002 - 3297 - 8316 4.08.ortega.alondra.210696@gmail.com Author García, J. Antonio Vázquez- 0000-0002-8393-5906 Herbario IBUG, Instituto de Botánica, Departamento de Botánica y Zoología, Centro Universitario de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara, km. 15.5 carr. Guadalajara-Nogales, Las Agujas, Zapopan, Jalisco, 45221, México & talaumaofeliae @ gmail. com; https: // orcid. org / 0000 - 0002 - 8393 - 5906 talaumaofeliae@gmail.com text Phytotaxa 2021 2021-08-09 513 4 271 281 http://dx.doi.org/10.11646/phytotaxa.513.4.1 journal article 10.11646/phytotaxa.513.4.1 1179-3163 5313008 Key to species of Magnolia sect. Macrophylla 1. Mature fruit broadly ovoid to subglobose .........................................................................................................................................2. - Mature fruit, oblongoid, ovoid or ellipsoid .......................................................................................................................................3. 2. Leaves 50–110 cm long; petals 20 to 23 cm long; gynoecium 4 cm long; stamens (300–)350–580; carpels (44–)50–80; carpel valve margin wide, 0.4–0.5 (–0.7) cm thick; growing at 150–300 m ( United States : AL, AR, GA, KY, LA, MS, NC, OH, TN, and VA).. .................................................................................................................................................................................... M . macrophylla - Leaves 25.0–35.0(–40.0) cm long; petals 10.0–11.0 cm long; gynoecium 2.0 cm long, stamens 200–220; carpels 30–40; carpel valve margin narrow, 0.2–0.3 cm thick; growing at 1500–1700 m ( Mexico : Nuevo León ) .................................. M . nuevoleonensis 3. Carpel beak < 0.7 cm ..........................................................................................................................................................................4. - Carpel beak 1.0– 1.5 cm .....................................................................................................................................................................5. 4. Multi-trunked shrub or lax trees 8.0–10.0 (–12.0) m; fruit cylindrical to ellipsoid; carpels 20–25(–50), growing below 150 m ( United States : Florida ) .......................................................................................................................................................... M . ashei - Single upright trees 8.0–25.0 m; fruit rhomboid-ovoid; carpels 50–65; growing at 800–1950 m ( Mexico )........... M . rzedowskiana 5. Carpels 42–78....................................................................................................................................................................................6. - Carpels 80–127..................................................................................................................................................................................7. 6. Stamens 192–216, carpels 42–54 ( México : Tamaulipas ).............................................................................................. M . alejandrae - Stamens 308–352, carpels 60–78 ( Mexico : Veracruz ) ..................................................................................................... M . vovidesii 7. Fruit dark green to yellow, young fruits glabrescent; stamens 1.9–2.1 cm long; carpels acute to blunt, the tip deciduous ( Mexico : Oaxaca )............................................................................................................................................................................. M. dealbata - Fruit pinkish-purplish to dark red, young fruit velvety; stamens 1.3–1.8 cm long; carpels acuminate to caudate, the tip sometimes persistent during dehiscence ( Mexico : Hidalgo / Puebla border) ......................................................................................... M . zotictla