Palm to 3 m tall. Stems 0.7 cm diameter, height and branching unknown, densely covered with reddish-brown scales. Sheaths closed, forming crownshafts, 7.5-8.5 cm long, densely covered with reddish-brown scales; ocreas 3 mm long; petioles 2-3.5 cm long, scaly as the sheaths; rachis 14.5-23.5 cm long; pinnae 3 per side of rachis, falcate, not contracted at the bases, middle pinna 15-18 cm long, 5.5-6 cm wide at the middle, apical pinna 5.5-7 cm long, 3-4 cm wide at the middle, praemorse; veins prominent and raised adaxially. Inflorescences infrafoliar, erect; peduncles 2-3 cm long, 0.2 cm wide; prophylls not known; rachis absent; rachilla 1, 9-10.5 cm long, ± rectangular in cross-section, glabrous; triads distichously arranged; staminate flowers not known; pistillate flowers (post-anthesis) 3 mm high; sepals 3, 2 mm long, widely spreading, not closely imbricate, not acuminate, minutely ciliate; petals 3, 3 mm long, widely spreading, not closely imbricate, acuminate, minutely ciliate; immature fruits 1.5 cm long, 0.4 cm diameter, ellipsoid, slightly curved, white or yellowish; endosperm homogeneous.
A P. cupulari inflorescentiis erectis atque perianthio florum pistillatorum libero imbricato late patenti differt.
Endemic to southcentral Vietnam in Kon Tum.
In primary, evergreen, broad-leafed forest on steep slopes on sandstone and gneiss at 1000-1200 m elevation.