Related Species
Nepenthes hamata belongs to what has been called the "Hamata group", which also includes four other closely related species from Borneo and Sulawesi: N. glabrata, N. muluensis, N. murudensis, and N. tentaculata. More recently, N. nigra has joined this group of related taxa. In their 2001 monograph, "Nepenthaceae", Martin Cheek and Matthew Jebb also suggested a close relative in the Sumatran species N. adnata.
Nepenthes hamata is very closely allied to N. tentaculata. It shares with this species the multicellular filiform appendages of the upper lid, as well as the general form of its laminae and pitchers. Nepenthes hamata clearly differs from N. tentaculata in the development of its peristome, which bears exaggerated flange-like extensions; N. tentaculata lacks conspicuous teeth altogether.
In their 2001 monograph, Martin Cheek and Matthew Jebb wrote that although the available herbarium material of N. hamata (around seven collections at the time) showed wide variation in peristome development, with some specimens appearing "very close to N. tentaculata", this did not represent a continuum of intergrades between N. hamata at one extreme and N. tentaculata at the other, but rather was due to a combination of lower and upper pitchers (the latter having more highly developed peristome teeth).
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