Pl. jungh.: 29 (1851).|
x = unknown
Vernacular names Nettle tree (En).
Origin and geographic distribution Dendrocnide comprises about 37 species and is found from India, Sri Lanka, China, throughout South-East Asia to Australia and the Pacific islands.
Uses The use of leaves or twigs of various Dendrocnide in poulticing as an analgesic can be largely ascribed to the irritating hairs. Sap or a decoction from the bark or other parts are taken for pulmonary and intestinal disorders without particular indication of their effectiveness. Likewise a herbal tea from the leaves is taken in some regions as a remedy to counteract the irritation caused by the hairs. The bark is occasionally used to make ropes. The soft wood is only suitable for firewood.
Production and international trade Dendrocnide is only used at a local scale.
Properties An aqueous suspension of the root of Dendrocnide stimulans showed strong inhibitory activity against Staphylococcus aureus in vitro. Many Dendrocnide species cause irritation or stings of varying intensity and duration following cutaneous contact.|In addition, Dendrocnide moroides (Wedd.) Chew from Australia, which is also reputed for its stinging hairs is known to contain moroidin. This bicyclic octapeptide, containing an unusual C-N linkage between tryptophan and histidine, was first isolated from the leaves and stalks of Dendrocnide moroides and subsequently shown to be the principle responsible for the long duration of the stings. Although no further phytochemical or pharmacological information is available for the Malesian species, the presence of compounds such as, or related to moroidin cannot be excluded.
Description Dioecious or monoecious evergreen shrubs or trees up to 15(—35) m tall; stem in general softwooded; normally with irritant hairs. Leaves alternate, simple, coriaceous, crenulate, undulate to smooth; petiolate; stipules intrapetiolar, entirely connate, coriaceous. Inflorescence axillary, racemose or paniculate, bracteate, pedunculate. Flowers free, sessile to pedicellate, pedicel swollen or not, in small fascicles or on flabellate receptacles. Male flowers: tepals 4(—5); stamens 4(—5); pistillode present. Female flowers: flabellately or distichously arranged or in loose fascicles, tepals 4; ovary superior, ovoid, unilocular, stigmas usually ligulate; staminodes absent. Fruit an achene, compressed or ellipsoidal to ovoid, not chartaceous, usually strongly warted.
Growth and development Branching of Dendrocnide is sympodial, and much like that of Terminalia, with the leaves often forming rosettes at the end of the twigs. Most species flower and fruit with no particular seasonality. Seed of Australian Dendrocnide remains viable on the forest floor for about 5 years.
Other botanical information Dendrocnide comprises 2 sections: Sarcopus with 27 species is found from India and China throughout South-East Asia to Australia and the South Pacific with its major centre in New Guinea, and Dendrocnide with 10 species confined to China, some parts of mainland South-East Asia and western Malesia as far as the Moluccas with its major centre in the Philippines. In the absence of voucher specimens, the identity of the plants for which uses are mentioned can sometimes be considered doubtful in view of their indicated natural distribution.
Ecology Dendrocnide are essentially lowland primary forest species preferring slightly moist and somewhat shady habitats. Some prefer limestones and their derived soils. Many of the New Guinea species seem tolerant of secondary forest and abandoned vegetable gardens.
Propagation and planting Dendrocnide can easily be propagated from seed. Detached branches of Dendrocnide sinuata that become buried resprout easily.
Harvesting Leaves, bark or roots of Dendrocnide are collected from wild plants whenever needed.
Handling after harvest All plant parts of Dendrocnide are usually used fresh.
Prospects Very little information is available about the phytochemistry and pharmacology of Dendrocnide. More research will therefore be needed to evaluate its possible potential.
Author: J.L.C.H. van Valkenburg
Source of This Article:
van Valkenburg, J.L.C.H., 2001. Dendrocnide Miq.In: van Valkenburg, J.L.C.H. and Bunyapraphatsara, N. (Editors). Plant Resources of South-East Asia No. 12(2): Medicinal and poisonous plants 2. Backhuys Publisher, Leiden, The Netherlands, pp. 217-220
van Valkenburg, J.L.C.H., 2001. Dendrocnide Miq.[Internet] Record from Proseabase. van Valkenburg, J.L.C.H. and Bunyapraphatsara, N. (Editors).
PROSEA (Plant Resources of South-East Asia) Foundation, Bogor, Indonesia. http://www.proseanet.org.
Accessed from Internet: 01-Jul-2016