Related Species
Nepenthes glabrata belongs to what has been called the "N. tentaculata group" or "Hamata group", which also includes four other closely related species from Borneo and Sulawesi: N. hamata, N. muluensis, N. murudensis, and N. tentaculata. More recently, N. nigra has joined this group of related taxa.
In their 2001 monograph, Cheek and Jebb considered N. glabrata to be most closely allied to N. muluensis based on its atypical lid nervation as well as the size, shape, and pigmentation of its upper pitchers. Currently, it appears that N. glabrata is most closely related to N. pitopangii, a highland species also endemic to Sulawesi. While the stem, laminae, and lower pitchers of these species are very similar, the markedly different upper pitcher morphology means that they are unlikely to be confused. The aerial pitchers of N. pitopangii are far less elongated than those of N. glabrata and completely lack wings.
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