Talauma, Jussieu (1789: 281) Baillon, 1866

Vázquez-García, J. Antonio, Neill, David A., Shalisko, Viacheslav, Arroyo, Frank & Merino-Santi, R. Efrén, 2018, Magnolia mercedesiarum (subsect. Talauma, Magnoliaceae): a new Andean species from northern Ecuador, with insights into its potential distribution, Phytotaxa 348 (4), pp. 254-268 : 264-265

Key to species of sect. Talauma in Ecuador

1. Stipules free from the petiole, stomata group number 2–3................................................................................................................2

- Stipules adnate to the petiole, stomata group number 5, subsect. Talauma .......................................................................................9

2. Fruit globose, rarely pyriform; stamens without a long connective appendage embedded in the gynoecium, subsect. Chocotalauma .................................................................................................................................................................................................3.

- Fruit elipsoidal; stamens with a long connective appendage embedded in gynoecium, subsect. Dugandiodendron .......................5. 3. Leaf blade elliptic........................................................................................................................................................ M. striatifolium

-. Leaf blades broadly elliptic to obovate.............................................................................................................................................4.

4. Fruit 5.0–5.5 × 5.0 cm, stamens 115–135 ........................................................................................................................... M. mashpi

- Fruit 15.9–16.4 × 10.0– 10.6 cm, stamens 195–205 .......................................................................................................... M. chiguila

5. Number of stamens 106–171........................................................................................................................................... M. jaenensis

- Number of stamens 40–100...............................................................................................................................................................6.

6. Trees 13–35 m tall, number of stamens 58–98....................................................................................................... 11. M. yantzazana

- Trees 3–11.5 m tall, number of stamens 40–55.................................................................................................................................7.

7. Carpels 10–15, lateral veins per side 10–16, petiole 2.0– 2.8 cm long.................................................................... M. bankardiorum

- Carpels 7–9, lateral veins per side 17–18, petiole 0.9–1.2 cm long..................................................................................................8.

8. Trees 10 m tall, leaves 15.9 × 9.9 cm ........................................................................................................................... M. shuariorum

- Trees 3 m tall, leaves 8.5 × 4.1 cm ...................................................................................................................................... M. lozanoi

9. Flower buds oblong (flowers and fruits unknown) ........................................................................................................ M. arroyoana

- Flower buds ovoid ellipsoid to subglobose......................................................................................................................................10

10. Carpels 5–20, stamens 20–90...........................................................................................................................................................11

- Carpels 35–165, stamens 105–175...................................................................................................................................................19

11. Leaves suborbicular, cordate, broadly ovate, rarely broadly elliptic................................................................................................12

- Leaves elliptic to lanceolate or broadly elliptic................................................................................................................................14

12. Outer petals narrowly oblanceolate and barely concave .................................................................................................. M. kichuana

- Outer petals obovate–spathulate and strongly concave....................................................................................................................13

13. Leaves usually suborbicular, stamens 50–54 ............................................................................................................... M. vargasiana

- Leaves elliptic to broadly elliptic, stamens 23–29 ................................................................................................. M. mercedesiarum

14. Carpels 4–8, stamens 20–42, narrowly ellipsoid, Minuticarpae group............................................................................................15

- Carpels 10–19, stamens>59–89, broadly ellipsoid..........................................................................................................................17

15. Leaf blades mostly glabrous or glabrescent on both sides ...................................................................................... M. llanganatensis

- Leaf blades at least abaxially pubescent...........................................................................................................................................16

16. Fruit 4.5 long, carpels 8; stamens 27–28..................................................................................................................... M. palanadana

- Fruit 2.5–3.0 cm long, carpels 7; stamens 38–42 ........................................................................................................... M. zamorana

17. Leaf blades at least abaxially pubescent...................................................................................................................... M. mindoensis

- Leaf blades mostly glabrous or glabrescent on both sides...............................................................................................................18

18. Hypsophylls 2, lateral veins per side 16–20...................................................................................................................... M. rimachii

- Hypsophylls 7–10, lateral veins per side 10–16................................................................................................. M. “ napoensis ” ined.

19. Carpels unbeaked, dorsal wall 2.5 cm thick or more, Pachyacarpae group.....................................................................................20

- Carpels strongly beaked at the tip, dorsal wall <2.0 cm thick, Echinaticarpae group......................................................................21

20. Carpels 125–130; stipular scar covering 100% of petiole................................................................................................... M. dixonii

- Carpels 98–102; stipular scar covering 30% of petiole............................................................................................... M. canandeana

21. Petioles and internodes pubescent, carpels 35–40................................................................................................................. M. neillii

- Petioles and internodes glabrous or glabrescent, carpels 98–165....................................................................................................22

22. Fruit ellipsoid, leaves 28–70 × 12—37 cm; lateral leaf veins per side 10–22 ............................................................ M. equatorialis

- Fruit broadly ovoid to subglobose, leaves 16–26 × 6–17 cm, lateral leaf veins per side 6–9.................................... M. pastazaensis