Taxonomy
N. hirsuta is most closely related to N. hispida and N. macrovulgaris. Botanists Matthew Jebb and Martin Cheek suggest that N. hirsuta is also related to N. philippinensis, a species endemic to Palawan in the Philippines.
| N. macrovulgaris | N. hirsuta | N. hispida |
|---|---|---|
| leaves charteous ≤30 cm, oblong to linear | leaves coriaceous ≤20 cm, canaliculate-spathulate or obovate | leaves coriaceous sessile ≤28 cm, oblanceolate-oblongate |
| apex acute to obtuse | apex acute or roundish | apex acuminate-obtuse, often unequal |
| base attenuate into a winged petiole, wings wider towards the base, clasping stem for about ½ its diameter, not decurrent | base attenuate, forming laterally flattened, semi-amplexicaul sheath | base attenuate, amplexicaul and often decurrent onto the internode |
| longitudinal veins: 2-3 on each side | longitudinal veins not prominent | longitudinal veins: 3 on each side |
| adult pitchers and stem glabrous, young pitchers with short, thin hairs | stem densely covered with long brown hairs, not as bristle-like as those of N. hispida | stem very densely covered with bristle-like purple-grey hairs |
In his Carnivorous Plant Database, taxonomist Jan Schlauer treats N. hispida as a heterotypic synonym of N. hirsuta.
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Herbarium specimens of N. hirsuta
Read more about this topic: Nepenthes Hirsuta