Magnolia, Linnaeus, 1753

Vázquez-García, J. Antonio, Tribouillier-Navas, Erick, Archila, Fredy, Véliz, Mario, Peña, A. Salome Ortega & Shalisko, Viacheslav, 2021, Three new species of Magnolia (Magnoliaceae) endemic to the north-wet-arc in the Maya Highlands of Guatemala, Phytotaxa 529 (1), pp. 57-70 : 68-69

Key to the native species of Magnolia in Guatemala

1 Petioles with conspicuous stipular scar, polyfollicles with circumscissile dehiscence ( Magnolia sect. Talauma )............................2

- Petioles without stipular scar, polyfollicles with dorsal dehiscence ( Magnolia sect. Magnolia ).......................................................4

2 Carpels 7–12, stamens 40–44, leaves 6.9–8.1 cm wide ...................................................................................................... M. quetzal

- Carpels 22–42, stamens 75–108, leaves 12.0–23.0 cm wide .............................................................................................................3

3 Flowers 20.2–22.2 cm in diameter, leaves 40.0–42.0 × 18.9–23.0 cm, carpels 38–42, floral bracts 2................................... M. ottoi

- Flowers 12.5–16.0 cm in diameter, leaves 22.5 × 12.5 cm, carpels 30–32, floral bracts 1........................................ M. steyermarkii

4 Mature fruit pubescent........................................................................................................................................................................5

- Mature fruits glabrous to glabrescent .................................................................................................................................................7

5 Mature leaves 30.0–43.0 cm long......................................................................................................................................... M. mayae

- Mature leaves 7.5–23.0 cm long.........................................................................................................................................................6

6 Fruits 6.8–8.8 cm long, stamens 103–111, carpels 47–55 (–58) ...................................................................................... M. veliziana

- Fruits 3.0– 5.7 cm long, stamens 61–93, carpels 23–28............................................................................................... M. hondurensis

7 Leaves broadly obovate, elliptical and ovate, margin of the leaves revolute.....................................................................................8

- Leaves oblong, lanceolate, elliptical to narrowly obovate, margin of the leaves not revolute.........................................................10

8 Flowers 9–10 cm in diameter, leaves glabrous on both surfaces, apex emarginate, fruits 4.4 cm long............................... M. javieri

- Flowers 12–15 cm in diameter, ferruginous leaves on the underside (at least the veins), apex acute, round to apiculate, fruits 4.8–7.5 cm long ..................................................................................................................................................................................9

9 Petals 8.3–8.5 cm long, stamens 73–76, carpels 34–39, fruits 7.0– 7.5 cm long............................................................. M. archilana

- Petals 6.5–7.0 cm long, stamens 92–98, carpels 22–25, fruits 4.8–5.2 cm long..................................................... M. guatemalensis

10 Stamens 53–94..................................................................................................................................................................................11

- Stamens (97–)100–120.....................................................................................................................................................................14

11 Pollyfollicles 40–50..........................................................................................................................................................................12

- Pollyfollicles 22–35..........................................................................................................................................................................13

12 Leaves ≤ 10 cm long................................................................................................................................................. M. tribouillierana

- Leaves 10–24 cm long .................................................................................................................................................... M. yoroconte

13 Spataceous bracts 3, leaf tip acute to obtuse, lateral veins 11–12, pubescent to glabrescent carpels, reddish floral staminophore .... ............................................................................................................................................................................... M. montebelloensis

- Spathaceous bracts 2, abruptly acuminate leaf apex, 13–17 lateral veins, glabrous carpels, purple floral staminophore................... ......................................................................................................................................................................................... M. poqomchi

14 Spathaceous bracts 1, globose fruits rel. l: a 1.66: 1, glabrous, 5.3–5.4 cm long, lateral leaf veins 15–17 ............ M. oscarrodrigoi

- Spathaceous bracts 2, oblongoid fruits rel. l: a 2.16: 1, glabrescent, 5.5–6.5 cm long, lateral leaf veins 10–14................................. ............................................................................................................................................................................ M. faustinomirandae