Related Species
Nepenthes eymae belongs to the loosely defined "N. maxima complex", which also includes, among other species, N. boschiana, N. chaniana, N. epiphytica, N. faizaliana, N. fusca, N. klossii, N. maxima, N. platychila, N. stenophylla, and N. vogelii.
Nepenthes eymae is very closely allied to the extremely polymorphic N. maxima, which is widespread across Sulawesi, New Guinea, and the Maluku Islands. It differs from this species in its wingless, infundibular and relatively small upper pitchers, ovate lower pitchers, and hastate lid. While some forms of N. maxima also produce entirely infundibular aerial traps, these are not usually as abruptly contracted (and therefore wine glass-shaped) as in N. eymae, and may or may not have fringed wings. Where the two species grow side-by-side, introgression may blur these morphological boundaries and make circumscription difficult. Like N. eymae, N. maxima and N. klossii (another closely related species) also commonly have two lid appendages.
Nepenthes fusca of Borneo may produce aerial pitchers resembling those of N. eymae, although its lower pitchers are considerably narrower and cylindrical in shape. The lower pitchers of N. eymae could potentially be confused with those of another Bornean endemic, N. veitchii, although otherwise these species have little in common, particularly with respect to the upper pitchers.
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