Leaves are coriaceous, subpetiolate, lamina linear to linear-lanceolate, 25-40 cm long, 3.5-6 cm wide, apex acute, clasping the stem by 1/2 of its circumference, decurrent on rosette and on climbing stem on 3-4 cm projecting from the stem as wings.[1]
There are three longitudinal nerves (rarely 4) on each side of the midrib in the outer third of the leaf.[1]
In the dry season, the leaves are modified into pitchers to capture and digest insects.[5]
The pitchers can reach up to 30cm long.[6]
In contrast to other closely related species, it has long tendrils and globose lower pitchers.[1]
Habitat and Distribution
Nepenthes holdenii occurs in localities situated in the transitional zone between lowland evergreen forest and low montane evergreen forest.[1]
Etymology
It was previously collected and diagnosed by Lecomte in the 1909 as Nepenthes thorelii, which is now considered an aggregate of Indochinese Nepenthes species.[1]
It was photographed by biologist Jeremy Holden in 2006;
Mey used these photographs, in situ examination of closely related species, and the previously collected specimen to distinguish N. holdenii from N. thorelii.[1]
Closely Related Species
These species are considered to be part of the Nepenthes thorelii aggregate.[1]
^ abcdefghiMey, F.; Catalano, S. M.; Clarke, C.; Robinson, A.; Fleischmann, A.; McPherson, S. (2010). "Nepenthes holdenii (Nepenthaceae), a new species of pyrophytic pitcher plant from the Cardamom Mountains of Cambodia". In McPherson, S. R. (ed.). Carnivorous Plants and their Habitats(PDF). Vol. 2. Poole: Redfern Natural History Productions. pp. 1306–1331.
