Related Species
The pitchers of N. rigidifolia resemble those of N. bongso to a degree, although their colouration is closer to that of N. spectabilis. Nepenthes rigidifolia differs from N. bongso, N. ovata and related species in having mostly ovoid upper pitchers (compared to infundibular in the others), distinctly thick and coriaceous laminae, and a narrower, cylindrical peristome with very short teeth. In addition, the lower pitchers of N. bongso are considerably larger than those of N. rigidifolia. While recognising N. rigidifolia as a valid species in his Carnivorous Plant Database, taxonomist Jan Schlauer suggests that it may be conspecific with N. densiflora.
Terrestrial pitchers of N. rigidifolia may superficially resemble those of N. spectabilis, but it can be distinguished from this species on the basis of its trap colouration, upper pitcher shape (largely ovate in N. rigidifolia versus predominantly cylindrical in N. spectabilis), thinner leaves, and branched spur.
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