Nepenthes hirsuta

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Nepenthes hirsuta

Upper pitchers of N. hirsuta. Bako National Park, Borneo.

Kingdom:	Plantae
Division:	Magnoliophyta
Class:	Magnoliopsida
Order:	Caryophyllales
Family:	Nepenthaceae
Genus:	Nepenthes
Species:	N. hirsuta

Binomial name

Nepenthes hirsuta
Hook.f. (1873)

Synonyms

Nepenthes leptochila
Danser (1928)

Nepenthes hirsuta (pronounced /nəˈpɛnθiːz hɚˈsjuːtə/, from Latin: hirsutus = hairy, bristly), or the Hairy Pitcher-Plant,^[1] is a tropical pitcher plant endemic to Borneo. It is characterised by an indumentum of thick brown hairs, which is even present on the inflorescence. Pitchers are mostly green throughout with some having red blotches on the inside surfaces.^[2]

N. hirsuta grows at an elevation of 200 to 900 m. It is present in a wide range of habitats, including kerangas forest, mossy banks in lower montane forest, open areas, and disturbed vegetation on lower ridges. It grows mostly on sandstone substrates.^[2]

1 Taxonomy
2 Infraspecific taxa
3 Natural hybrids
4 References

[edit] Taxonomy

N. hirsuta is most closely related to N. hispida and N. macrovulagris.

Morphological differences between N. macrovulgaris, N. hirsuta and N. hispida (Steiner, 2002 after Clarke, 1997)
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

Morphological differences between *N. macrovulgaris*, *N. hirsuta* and *N. hispida* (Steiner, 2002 after Clarke, 1997)
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

Herbarium specimens of N. hirsuta

[edit] Infraspecific taxa

Nepenthes hirsuta var. glabrata Macf. (1908)
Nepenthes hirsuta var. glabrescens W.G.Sm. (1882) [=N. distillatoria]
Nepenthes hirsuta var. glabrescens rubra auct. non Hort. ex Rafarin: Nichols. (1892) [=N. distillatoria]
Nepenthes hirsuta var. typica Macf. (1908) nom.illeg.

[edit] Natural hybrids

The following natural hybrids involving N. hirsuta have been recorded.

N. albomarginata × N. hirsuta^[2]
N. ampullaria × N. hirsuta^[2]

[edit] References

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Nepenthes hirsuta

^ Phillipps, A. & A. Lamb 1996. Pitcher-Plants of Borneo. Natural History Publications (Borneo), Kota Kinabalu.
^ ^a ^b ^c ^d Clarke, C.M. 1997. Nepenthes of Borneo. Natural History Publications (Borneo), Kota Kinabalu.

Clarke et al. (2000). Nepenthes hirsuta. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 10 May 2006.
Steiner, H. 2002. Borneo: Its Mountains and Lowlands with their Pitcher Plants. Toihaan Publishing Company, Kota Kinabalu. viii + 136 pp.