Maasia

Turner, Ian M. & Utteridge, Timothy M. A., 2016, Whither Polyalthia (Annonaceae) in Peninsular Malaysia? Synopses of Huberantha, Maasia, Monoon and Polyalthia s. s., European Journal of Taxonomy 183, pp. 1-26 : 2-3

Key to species of Maasia

1. Leaves generally not exceeding 8 cm long, 3 cm wide. Flowering pedicel to 5 mm long, petals to 6 mm long. Monocarps ellipsoidal, few (5 or less), not exceeding 2 cm long .............. M. hypoleuca

– Leaves generally more than 8 cm long, 3 cm wide. Flowering pedicel more then 5 mm long, petals more than 6 mm long. Monocarps globose or if ellipsoidal then many (generally 10 or more) and more then 2 cm long at maturity ........................................................................................................ 2

2. Flowering pedicel more than 17 mm long, c. 1 mm thick, petals more than 1 cm long. Monocarps ellipsoidal ...................................................................................................................... M. sumatrana

– Flowering pedicel to 17 mm long, c. 0.5 mm thick, petals to 8 mm long. Monocarps globose ............. ............................................................................................................................................. M. glauca