Related Species
Nepenthes rhombicaulis is very similar to N. gymnamphora in both morphology and growth habit. It is sympatric with this species on Mount Pangulubao. Nepenthes rhombicaulis also bears a close resemblance to N. hirsuta from Borneo.
In 2001, Charles Clarke performed a cladistic analysis of the Nepenthes species of Sumatra and Peninsular Malaysia using 70 morphological characteristics of each taxon. The resultant cladogram placed N. rhombicaulis in an unresolved polytomy at the base of the Montanae/Nobiles clade, together with N. benstonei.
Read more about this topic: Nepenthes Rhombicaulis
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