Adolph Daniel Edward Elmer recorded a plant from Mount Pulgar (now known as Thumb Peak) matching the description of N. deaniana.
Nepenthes peltata appears to be most closely allied to the Palawan endemics N. attenboroughii, N. deaniana, N. mantalingajanensis, and N. mira.
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It has been speculated that the species may produce aerial pitchers only in deep shade or if provided with sufficient vegetation to support a climbing stem, as is the case with the closely related N. deaniana and N. mira.
Nepenthes clipeata | Nepenthes bokorensis | Nepenthes | Nepenthes rajah | Nepenthes mantalingajanensis | Nepenthes klossii | Nepenthes faizaliana | Nepenthes epiphytica | Nepenthes abgracilis | Nepenthes rigidifolia | Nepenthes mira | Nepenthes khasiana | Nepenthes kerrii | Nepenthes deaniana | Nepenthes cid | Nepenthes aristolochioides | Nepenthes viridis | Nepenthes ovata | Nepenthes mirabilis | Nepenthes spathulata | Nepenthes rhombicaulis | Nepenthes pitopangii | Nepenthes × kinabaluensis | Nepenthes holdenii | Nepenthes × harryana | Nepenthes dubia | Nepenthes burbidgeae | Nepenthes bellii | A skeletal revision of ''Nepenthes'' (Nepenthaceae) | ''Nepenthes smilesii'' from Kirirom National Park |