Slender, 2.5 m. tall: leaf-blade 40-50 cm. and more long, glossy and glabrous, with several very broad strongly ribbed alternate pinnae; rachis convex on the back, lightly ridged on upper face; pinnae 30-35 cm. long, '6-9 cm. broad, lance-oblong and strongly sigmoid, tapering to narrow point or to a cauda, with 7-15 conspicuous costa standing 4-10 mm. apart at the middle and prominently curved to the narrowed base, lucid particularly on the lower face: pistillate spadix once-branched from a short rachis, abou't 22 cm. long and nearly as broad, the glabrous rachillae 10-20 cm. long and divaricate or upwardly curved: fruit small, short-oblong, obtuse, 5-6 mm. long, 4-5 mm. thick, irregularly and shallowly wrinkled in drying; cupule small, the lobes spreading.
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