Nepenthes bellii /nɪˈpɛnθiːz ˈbɛliaɪ/ is a tropical pitcher plant endemic to the Philippine islands of Mindanao and Dinagat, where it grows at elevations of 0–800 m above sea level.

[2] The holotype is deposited at the herbarium of the North Carolina Botanical Garden (NCU); isotypes are held at the KC and Nagoya herbaria.

[6][7] Nepenthes globamphora, which is now considered to be a heterotypic synonym of N. bellii,[4][7] was described by Shigeo Kurata and Masami Toyoshima in a 1972 issue of The Gardens' Bulletin Singapore.

[3] The holotype of this taxon, designated as Kurata & Toyoshima 1128, was collected on August 22, 1965, from Mount Legaspi in Surigao del Sur, Mindanao, at an elevation of 270 m.[3][7] It is deposited at the herbarium of the Nippon Dental College (NDC).

[7] A very early mention of N. globamphora (at the time a nomen nudum as the taxon was undescribed) appeared in a 1966 issue (volume 36, page 15) of The Journal of Insectivorous Plant Society.

[7] In the latter publication, Cheek and Jebb noted that little ecological data was known about the species and that it was represented in herbaria by only the two type collections (Kondo 11514 and Kurata & Toyoshima 1128) at the time.

[7] Stewart McPherson's 2009 monograph, Pitcher Plants of the Old World, presented an updated description and colour habitat photographs of N. bellii.

[4] Its apex is acute or obtuse,[4] whereas the base is slightly attenuate and clasps the stem for half to three-quarters of its circumference.

No appendages are present on the lower surface of the lid, although it bears a small number (5 or 6) of sparsely scattered nectar glands.

[4] An inconspicuous indumentum of reddish or rust-coloured simple (unbranched) hairs measuring 0.1 mm in length may be present on the pitchers and inflorescence.

[4][7] The stem, tendrils and midribs are most commonly yellow to green, but may be tinged orange or red in some specimens; this more intense colouration seems to be associated with drought stress.

Upper pitchers are similar but often lack blotches, being a solid green, yellow, orange, or red, although reddish aerial traps occasionally do bear some darker markings.

[10] Stewart McPherson considers the species "not currently threatened" and writes that it is "widespread" across Dinagat and northern Mindanao, where it is represented by "extensive stands".

[4] The combination of subglobular lower pitchers, densely fringed wings (often with clustered filaments) and proportionately long tendrils separate N. bellii from all other species with the possible exception of the miniature N. argentii.

[7] However, the latter species can hardly be confused with N. bellii as it does not produce a climbing stem, differs markedly in the shape of the lamina, and has a uniquely curved peristome that continues along the lower surface of the lid.

[7] Nepenthes bellii is closely allied to N. merrilliana and N. surigaoensis and shares with these species a similar morphology of the pitchers and laminae as well as a reddish colouration of the uppermost leaves.

[4] More generally, N. bellii appears to fall under B. H. Danser's classical Insignes group, which also includes N. burkei, N. insignis, N. merrilliana, and N. ventricosa, among others, with N. sibuyanensis, N. barcelonae and N. aenigma being recent additions.

[13] In their 2001 monograph, Martin Cheek and Matthew Jebb also noted a "remarkable resemblance" between the lower pitchers of N. tomoriana and those of N. bellii.