Disepalum, Hooker, 1860

Randi, Agusti, Wijedasa, Lahiru S. & Thomas, Daniel C., 2022, Disepalum rawagambut (Annonaceae), a new tree species from peat swamp forest of Sumatra, Indonesia, Phytotaxa 530 (1), pp. 121-126 : 125

Key to the Disepalum species of Sumatra

1. Corolla lobes 5–9, as wide as or wider than long...................................................................................................... D. platypetalum

- Corolla lobes 4, longer than wide.......................................................................................................................................................2

2. Corolla lobes linear and of uniform thickness, with acute apex, to 4.5 mm wide at the base........................... D. acuminatissimum

- Corolla lobes spatulate, slightly thickened towards the blunt apex, less than 2 mm wide at the base...............................................3

3. Sepals 6.5–10.5 × 5.5–8.0 mm; carpophores 2.2–4.0 cm long, 0.8–1.5 mm thick, monocarps 9.0–13.0 × 7.5–10.0 mm; small tree to 8 m tall in upland and hill forests at 600–1200 m ......................................................................................................... D. longipes

- Sepals 10.0–16.0 × 8.0–14.0 mm; carpophores 4.0– 8.6 cm long, 2.0–6.0 mm thick, monocarps 10–21 × 6–15 mm; medium-sized trees to 25 m tall in lowland peat swamp forest ......................................................................................................... D. rawagambut