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P.trineuron
| Habit : | A climber, quite glabrous, branches slender, rigid, black nodes much enlarged.
| | Leaves : | Thin elliptic-lanceolate, subacute or scuminate, 3-nerved nearly to the tip. Leaves 7.5 - 12.5 by 1.86 - 3.75 cm., base acute; principal nerves 1-2 pair, slender; petiole 0.63 - 1.25 cm.
| | Spikes : | Peduncles longer than the petioles, male spikes slender shorter than the leaves, male and female bracts closely adnate to the rachis, stamens 2. fruits distant globose quite smooth. Male spikes 5 - 7.5 cm.; bracts semicircular, rather distant. Fruiting spike rigid; bracts forming a thick cup.
| | Fruits : | Rachis black, naked between the fruits. |
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