Canopy palm. Stem solitary, 8 to 20 m tall, 12-25 cm in diameter, grey to white, internodes covered with thin layer of wax. Leaves 14–22, in dense, hemispheric crown, to 5 m long; rachis 203-290 cm long, twisted 90° on distal portion thereby holding the pinnae in a vertical position, adaxially flattened in about half of its length and ending in a well-defined 2 mm hastula-like projection, glabrescent with remnants of scales near the margins, abaxially convex, covered with oblong, adpressed, white, membranaceous scales; pinnae ca. 83-106 on each side, regularly arranged in one plane, horizontal, with the terminal part descending, the central ones 50-83 cm long and 4-5 cm wide, below with a thick, white to light brown, waxy indument, sometimes the apical pinnae united along the margins. Inflorescences arching to pendulous, to 3 m long, branched 3 times. Fruits globose, orange-red when ripe, 1.7-2.0 cm diam., exocarp smooth. Seeds 1.3-1.5 cm diam. C. amazonicum is diagnosed by its dense crown and leaves with regularly inserted and horizontal pinnae, staminate flowers with 9-12(-13) stamens, and smooth fruits. It is also the species that grows at lowest elevation.
Southeastern Ecuador, on eastern slopes of the Andes; premontane or lower montane rain forest, at 820-1200 m elevation.