Very near to P. longirostris. Leaves broader, narrowly oblong to linear, 5-30 cm by 8-12 mm, abruptly acuminate, caudate (the tail 1-3 cm long), the base narrowed into a 1-5 cm long petiole, the margins smooth almost throughout, scabrous only at the very top just below the aculeate-scabrous tail. Inflorescence consisting of a single spikelet, 5-8 by 4-5 mm. Glumes 2¾-3¼ by 1¾-2¼ mm. Upper sterile scales narrower and slightly longer than in P. longirostris, very narrowly elliptic to oblong-linear.
In rain-forests, on shaded river-banks, at low alt., up to 900 m.
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