Nepenthes mapuluensis is a limestone-associated Bornean species with broad pitcher mouths and conspicuous wings on the pitchers described in its original treatment. Its botanical history illustrates why an old collection locality and a modern nursery claim should be kept distinct.
Accepted name
Kew accepts Nepenthes mapuluensis J.H.Adam & Wilcock, published in 1990 and native to East Kalimantan. No synonyms or accepted infraspecific children are displayed in the reviewed record.
Original identification
The 1990 description was based on Kostermans 14017, collected at Mount Ilas Mapulu in September 1957. It describes narrow, leathery leaves, ellipsoid pitchers 11–21 centimetres tall, prominent fringed wings and a broad, flattened rim with a wavy outer edge. The mouth is oblique and the lid underside has a central gland-bearing ridge.
The authors contrast it with campanulata, whose bell-shaped trap and thin rim differ, and with the hairier veitchii. Female flowers and fruits were unknown in their material. Those omissions should not be filled with details borrowed from a related species.
Limestone habitat and later observations
The original account reports limestone habitat at 800 metres. Wistuba’s nursery account notes plants have also been found much lower, compares their dark, contrasting pitchers with northiana, and reports robust, fast growth among its offered clones under suitable lowland conditions.
The modern comparison does not make the two names synonyms: Kew continues to accept mapuluensis. Similarly, nursery performance describes the material and conditions observed; it is not a promise that every accession will behave identically.
Growing guide
The nursery experience supports a lowland cultivation framework. It does not establish a universal temperature ceiling, fertiliser dose or mineral requirement.
- Warmth: Obtain the supplier's actual day and night conditions and monitor the proposed growing space through its warmest periods.
- Substrate: A limestone association does not by itself establish a need to add lime or use hard water. Root chemistry requires evidence beyond the name of the rock.
- Drainage: Choose the container and medium together, checking how water moves through them under your watering routine.
- Acclimatisation: Increase exposure progressively after a move rather than assuming robust nursery growth removes the need for transition.
- Identity: Keep clone codes and photographs of leaves, pitcher wings, rim and lid underside linked.
Interpreting size and colour
A measurement in the original description is an observation on the studied material, not a minimum size for every juvenile in cultivation. Record the plant's stage before treating a smaller trap as evidence against its identity.
Likewise, dark colour is useful descriptive information but should not replace structural characters. A carefully lit photograph with a scale and several views provides more reviewable evidence than a heavily edited close-up.
Editorial record: Reviewed 2 October 2026. Original description and current accepted name checked; nursery observations attributed. Verified photography, owner and visual review remain pending.
