Cypselae oblong to sub-obovate, truncate, attenuate to
rostrate at the apex, glabrous to pubescent, sometimes dimorphic with the marginal cypselae conspicuously larger than the central ones; pappus of scabrid to plumose bristles, capillary to narrowly paleaceous, often plumose only at the apex, equal to different in length, less commonly reduced to a crown of fringed scales, or pappus absent.
5 cm long; slightly
rostrate connective; filament glabrous or slightly pilose at the base, usually narrowing towards the anther, 0.
Valves linear-lanceolate, constricted at the middle, with
rostrate ends.
Cypselae
rostrate at the apex, pubescent; pappus of scabrid, capillary bristles.
Hexopetion and Astrocaryum are superficially similar in sharing the white indument on abaxial surface of pinnae, flattened spines, robust inflorescence branched to one order with catkin-like staminate rachillae or distal portion of them, pistillate flower(s) basal and considerably larger than staminate ones, fruits large, oval-obovoid,
rostrate, spiny, endocarp with superficial black fibers forming a star-like pattern around germinating pores.
Cypselae
rostrate to slightly constricted at the apex, pubescent; pappus of scabrid, capillary bristles.
Cypselae dimorphic; marginal cypselae rudimentary,
rostrate at the apex, glabrous or pubescent; central cypselae ribbed, very hairy at the base or pubescent throughout; pappus of numerous, persistent scales.
