Orania (Keim & Dransfield, 2012)

Adorador, Jiro T. & Fernando, Edwino S., 2019, Orania zheae (Oranieae, Arecoideae, Arecaceae), a new species from the Philippines, with notes on another slender-stemmed species, Phytotaxa 391 (1), pp. 69-80 : 78

Key to the species of Orania in the Philippines

1 Large tree palms (18–30 m tall and 15–30 cm diam.); leaves with more leaflets per side of rachis (60–122); embryo sub-basal ... 2

– Small to medium tree palms (5–8 m tall and 8–24 cm diam.); leaves with fewer leaflets per side of rachis (28–34); embryo eccentrically apical (unknown in O. sibuyanensis )......................................................................................................................................... 3

2 Fruit size larger (6.5–7.5 cm); eophyll bifid; distributed in Philippines (except Palawan), Sulawesi, Maluku, Misool Island, and northern parts of Papua New Guinea........................................................................................................................ Orania palindan

– Fruit size smaller (3.6–5 cm); eophyll pinnate; distributed in Palawan and Sabah ........................................ Orania paraguanensis

3 Peduncle much robust (5.7 cm diam.); fruits sub-pyriform; widespread in the Philippines.................................... Orania decipiens

– Peduncle much slender (1.5 cm diam.); fruits spherical; narrowly distributed.................................................................................. 4

4 Inflorescences bisexual or staminate; petals of the male flowers linear-lanceolate with narrowly acute non-cucculate apices; with epipetalous staminodes in pistillate flowers; found in forests over limestone in Samar Island..................................... Orania zheae

– Inflorescences bisexual; petals of the male flowers spathulate with short-acute cucculate apex; without epipetalous staminodes in pistillate flowers; found in forests over ultramafic rocks in Sibuyan Island...................................................... Orania sibuyanensis