Nepenthes rhombicaulis
A vigorous highland pitcher plant from the Lake Toba area of North Sumatra, named for its stems, which are rhomboid in cross-section. It climbs through lower montane forest, and its lower pitchers, about 12 cm tall with fringed wings, sit in the leaf litter on the forest floor. Little is published about its cultivation, so the advice here is based on its cool, very humid habitat and on how similar Sumatran highland species are grown.
Where it grows wild
A terrestrial climber of lower montane forest on steep slopes. It is common in the forest understory, where the lower pitchers form in detritus and leaf litter. The stems can climb up to about 35 m into the canopy, one of the longest in the genus, but the upper pitchers are poorly known from the wild.
The literature gives about 1600–2000 m, on mountains such as Pangulubao and Lubukraya. The two measured sites are at 1248 and 1674 m.
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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app.