Macropharynx, Rusby, 1927

Morales, J. Francisco & Endress, Mary E., 2024, A synopsis of Macropharynx (Apocynaceae) in Colombia, with comments on floral characters, and a new combination, Phytotaxa 677 (2), pp. 173-180 : 175

Key to the species of Macropharynx in Colombia

1. Leaves peltate .....................................................................................................................................................................................2

- Leaves not peltate ...............................................................................................................................................................................3

2. Corolla lobes 11–16 mm long, the mouth 11–14 mm in diameter .............................................................................. M. colombiana

- Corolla lobes 24–35 mm long, the mouth 17–21 mm in diameter.................................................................................... M. isthmica

3. Pedicels lacking bracteoles; sepals 3–3.5 mm long; mature follicles less ca. 5 mm in diameter.................................... M. stenantha

- Pedicels with bracteoles; sepals 10–21 mm long; mature follicles more than 10 mm in diameter....................................................4

4. Sepals 4–6 mm wide, elliptic; anthers 7–8 mm long........................................................................................................ M. renteriae

- Sepals 1–2 mm wide, linear to very narrowly elliptic; anthers 9–10 mm long............................................................. M. spectabilis