Description
Nepenthes bicalcarata plants are the largest in the genus, climbing up to 20 m into the forest canopy. The cylindrical stem is thicker than that of any other Nepenthes species, measuring up to 3.5 cm in diameter. Internodes are up to 40 cm long.
The leaves of N. bicalcarata are petiolate and coriaceous in texture. The lamina is obovate-lanceolate in form and also reaches huge dimensions, growing to 80 cm in length and 12 cm in width. It is slightly decurrent on the stem, forming two narrow wings. The lamina has indistinct longitudinal veins and numerous pennate veins. Tendrils may be up to 60 cm long and 8 mm wide. They are hollow and swollen near the pitcher.
Although most parts of the plant are very large, the pitchers themselves do not rival those of species such as N. rajah. Nevertheless, they may have a volume of over one litre and grow up to 25 cm high and 16 cm wide. A pair of prominent fringed wings (≤15 mm wide) runs down the front of lower pitchers. These are usually reduced to ribs in aerial pitchers. The peristome (≤20 mm wide) is characteristically flattened and curved inwards. The inner portion of the peristome accounts for around 70% of its total cross-sectional surface length. It bears small but distinct teeth. The two sharp spines for which the species is famous are present on the underside of the pitcher lid, and may be 3 cm long. They are derived from the uppermost 10–12 peristome ribs. The pitcher lid or operculum is reniform to cordate and has no appendages. An unbranched spur (≤15 mm long) is inserted at the base of the lid.
Nepenthes bicalcarata has a paniculate inflorescence. The peduncle may be up to 40 cm long and the rachis can reach 100 cm in length. Female inflorescences are usually shorter. Branches on the flower stem are up to 40 mm long and bear up to 15 flowers. Sepals are either obovate or lanceolate and up to 4 mm long. A study of 120 pollen samples taken from a herbarium specimen (Fosberg 43860, altitude not recorded) found the mean pollen diameter to be 28.9 μm (SE = 0.4; CV = 7.5%).
Mature plants are virtually glabrous. Caducous hairs are present on the youngest parts of the plant and on the inflorescences.
Nepenthes bicalcarata varies little across its range. Consequently, no infraspecific taxa have been described.
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