KEY TO THE SPECIES OF MANDEVILLA (EXOTHOSTEMON GROUP) IN ECUADOR

1. Corolla hypocrateriform.

2. Petioles 16–28 mm long_____________________________________________________________________________ M. pavonii

2. Petioles 3–10 mm long.

3.Leaf blade cordate or auriculate basally; inflorescence with the flowers laxly arranged; style-head 1.8–2.2 mm long ______________________________________________________________________________________ M. subsagittata

3.Leaf blade obtuse basally; inflorescences with the flowers agglomerate; style-head less than 1.3 mm long _____________________________________________________________________________________________ M. rugellosa

1. Corolla infundibuliform.

4. Floral bracts foliaceous to subfoliaceous, 11–35 mm long.

5. Sepals 1.8–5.5 mm long;cloud forest at 1500–2000 m ___________________________________________________ M. horrida

5. Sepals 7–18 mm long; tropical forest below 1200.

6. Lower part of the corolla tube 12–14 mm long,the upper part 12.5–13.5 mm long ______________________ M. inexperata

6. Lower part of the corolla tube 20–35 mm long,the upper part 14–31 mm long.

7. Upper part of the corolla tube 27–31 mm long, 7–9 mm in diameter at the mouth______________________ M. sagittarii

7. Upper part of the corolla tube 15–21 mm long, 16–21 mm in diameter at the mouth.

8. Branchlets hispid to hirsute;leaf blade sparsely to densely hirsute abaxially;floral bracts 25–35 × 2–3 mm; apex of the floral bud shortly acuminate or shortly apiculate _______________________________________ M. hirsuta

8. Branchlets tomentose; leaf blade tomentose abaxially; floral bracts 15–20 × 6–12 mm; apex of the floral bud obtuse to rounded ____________________________________________________________________ M. hansenii

4. Floral bracts scarious, 1–5 mm long.

9. Leaf blade acute,obtuse or rounded basally __________________________________________________________ M. arcuata

9. Leaf blade cordate to subcordate basally.

10. Corolla mouth 15–27 mm in diameter.

11.Sepals usually 4–7 mm long;follicles 25–35 cm long;seeds 13–16 mm long____________________ M. symphitocarpa

11.Sepals usually 1.5–3 mm long; follicles 6–20 cm long;seeds 6–10 mm long ____________________________ M. scabra

10. Corolla mouth 4–11 mm in diameter.

12.Pedicels 11–22 mm long;apex of the floral bud obtuse ________________________________________ M. polyantha

12.Pedicels 2–9 mm long;apex of the floral bud acute-apiculate ______________________________________ M. trianae