Related Species
Nepenthes jacquelineae is thought to be most closely related to N. flava, N. inermis, N. jamban, N. talangensis, and N. tenuis. It shares with these species features such as infundibulate pitchers which are wholly glandular on their inner surfaces, bracteate inflorescences, and sessile leaves. All of these Nepenthes produce very viscous pitcher fluid.
However, N. jacquelineae has a more robust growth habit and produces consideraby larger pitchers than these species. The shape of the pitcher cup is closest to N. talangensis (minus the peristome), whereas the lid resembles that of N. tenuis, although it is broader throughout and contracted towards the base. N. jacquelineae can also be distinguished from N. tenuis by its ovate-spathulate leaf blade, as opposed to linear-lanceolate in the latter.
The large glands on the underside of the lid are unique among Sumatran Nepenthes species, and help to distinguish N. jacquelineae from related taxa. N. jamban also possesses very large nectar glands (≤0.5 mm), but differs in having longer and one-flowered partial peduncles, and a narrower lid.
Nepenthes flava can be easily distinguished from N. jacquelineae on the basis of its ovate or oblong lid and cylindrical peristome.
The most characteristic feature of N. jacquelineae is its greatly expanded peristome, which can be up to 3.5 cm wide in upper pitchers. It is unusually smooth and only has significant ribs at the front where it is contracted. This is in stark contrast to the closely related N. inermis, which produces upper pitchers that lack a peristome completely. The only other species with a similarly expanded peristome is N. platychila from Borneo, although the two taxa are not otherwise related.
Read more about this topic: Nepenthes Jacquelineae
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