Table 1.
The main morphological differences between N. pantaronensis, N. pulchra and N. petiolata (data from [14,15]).
| N. pantaronensis | N. pulchra | N. petiolata | |
|---|---|---|---|
| Lower Pitchers | |||
| Overall form | Cylindrical, bottom quarter to third variably inflated | Cylindrical, bottom quarter to third variably inflated, often bulbous | Cylindrical, bottom third ovate and variably inflated |
| Dimension | Up to 35 cm tall and 6 cm wide, though usually smaller | Up to 35 cm tall and 6 cm wide, though usually smaller | Usually up to 21 cm tall and 4.5 cm wide |
| Wings | Seldom fringed, mostly only ribs | Fringed wings | Fringed wings |
| Peristome | Flattened, up to 2.5 cm wide | Flattened, up to 2.5 cm wide | Loosely cylindrical |
| Appendage | Very prominent, triangular, hooked appendage | Rounded, triangular appendage; sometimes only keel present | Only keel; no appendage |
| Upper Pitchers | |||
| Overall form | Bottom fifth to quarter inflated and bulbous, narrowing above this part before becoming cylindrical towards the pitcher opening | Bottom fifth to quarter inflated and bulbous or near spherical, and slightly infundibular above towards the pitcher opening | Cylindrical, bottom fifth to quarter ovate and slightly swollen |
| Dimension | Up to 40 cm long and 5 cm wide, usually smaller | Up to 34 cm long and 7 cm wide, occasionally up to 42 cm long | Up to 18 cm long and 5 cm wide, occasionally up to 25 cm long |
| Wings | Indiscernible | Hardly discernible; reduced to ribs if present | Hardly discernible; reduced to ribs if present |
| Peristome | Cylindrical or slightly flattened, 1–2 cm wide | Flattened, 3 cm wide | Loosely cylindrical, 1–2 cm wide |
| Appendage | Not hooked, sometimes reduced to a keel | Hooked and rounded, up to 5 mm long near base of the lid | No appendage |
| Leaf | |||
| Petiole canaliculate on the nonclimbing stem and broad-winged on the climbing stem. Decurrent down full length of internode. Leaves with two longitudinal nerves. | Petiole broadly winged, decurrent down full length of internode, often part way down previous internode as well. Leaves with 3–4 longitudinal nerves. | Petiole canaliculate or winged, clasping the stem. Leaves with four longitudinal nerves. | |
| Habitat and Distribution | |||
| Epiphytic on high trees in lower montane forest at the type locality. Pantaron range and adjacent mountains. | Strictly terrestrial in clearings and montane scrub. Currently only known from Mt. Kiamo. | Epiphytic or rarely terrestrial in lower and upper montane forest. Diwata mountains. | |