Related Species
Nepenthes sibuyanensis belongs to B. H. Danser's Insignes group, which also includes the closely related Philippine species N. burkei, N. merrilliana, and N. ventricosa, as well as N. insignis from New Guinea. It appears to be intermediate between N. merrilliana and N. ventricosa in terms of both morphology and geographical distribution.
The species can be distinguished from both N. burkei and N. ventricosa on the basis of its pitcher shape; the traps of N. sibuyanensis are ovate to slightly infundibulate, whereas those of the latter species are ventricose in the lower part and constricted in the middle. In addition, the pitchers of N. burkei and N. ventricosa are smaller, rarely exceeding 20 cm in height.
Nepenthes merrilliana produces the largest pitchers in the Insignes group and, unlike N. sibuyanensis, has two-flowered pedicels. Furthermore, its pitchers bear a pair of well developed fringed wings.
Nepenthes sibuyanensis has also been compared to N. insignis. The former produces one-flowered pedicels, whereas those of N. insignis are two-flowered. The pitcher mouth of N. sibuyanensis is almost horizontal, compared to oblique in the latter. In addition, the peristome of N. sibuyanensis forms a short neck, while N. insignis lacks a neck completely. Furthermore, N. insignis has shorter peristome teeth than N. sibuyanensis (1 mm versus 5 mm). The pitchers of N. sibuyanensis also differ in shape, being ovate or slightly infundibulate.
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