Nepenthes rhombicaulis
 Nepenthes rhombicaulis /nɨˈpɛnθiːz ˌrɒmbɨkˈɔːlɪs/ is a tropical pitcher plant endemic to Sumatra. The specific epithet rhombicaulis is formed from the Latin words rhombicus meaning rhomboid and caulis stem. It refers to the cross-sectional shape of the stem internodes.