Nepenthes izumiae /nɪˈpɛnθiːz iˈzuːmiaɪ/ is a tropical pitcher plant endemic to Sumatra, where it grows in montane forest at 1700–1900 m above sea level.

[3] Flowering-size specimens of N. izumiae, identified as N. singalana from Mount Talakmau, were already in cultivation before the species was formally published.

[6] Nepenthes izumiae was formally described by Troy Davis, Charles Clarke and Rusjdi Tamin in a 2003 issue of the botanical journal Blumea.

[2][7] The next detailed treatment of N. izumiae appeared in Stewart McPherson's 2009 monograph, Pitcher Plants of the Old World.

[4] Nepenthes izumiae is a climbing plant growing to a height of 8 m. The stem ranges in colour from green to reddish.

A triangular or hook-shaped basal crest (≤1 cm long) is commonly present on the lower surface of the lid.

The peristome is generally purple, black, or dark brown, but may have lighter coloured teeth ranging from green, through yellow, to white.

[4] An indumentum of red, brown or white hairs up to 1 mm long may be present on the laminar margins, pitchers (particularly lower ones), tendrils, and parts of the inflorescence.

[4] Nepenthes izumiae has only been recorded from two peaks north of Bukittinggi[3] in the Barisan Mountains of West Sumatra, Indonesia.

[4][9] The typical habitat of N. izumiae is upper montane mossy forest, where conditions are moist and the plants experience diffused sunlight.

[4] In addition, N. lingulata completely lacks nectar glands on the underside of the lid and has a very dense woolly indumentum.

Nepenthes izumiae also differs in several other vegetative features: it has broader laminae with persistent hairs on the margins, longer and narrower terrestrial traps, and a thinner peristome with finer ribs and teeth.

[3] Nepenthes izumiae may also bear a resemblance to N. bongso and N. ovata, but both of these species have entirely infundibular upper pitchers and often have spathulate laminae with glabrous margins.

[4] Nepenthes spathulata could also be confused with N. izumiae, but it can be distinguished on the basis of its wider laminae and pitchers, the latter typically also being lighter in colouration.

[4] A single mature female plant of N. dubia × N. izumiae grows along the summit trail on Mount Talakmau.

[3] This hybrid is listed as N. dubia × N. singalana in Charles Clarke's 2001 monograph, Nepenthes of Sumatra and Peninsular Malaysia, because at the time of its publication it was uncertain whether N. izumiae represented a distinct species.