Imperata cylindrica (alang-alang)
Alang-alang is considered one of the ten worst weeds in the world, but has many uses as a traditional medicine.
Imperata cylindrica (Image: Willow Munger)
Considered by IUCN to be one of the world's worst weeds.
Seasonally wet places and alongside streams; a common and aggressive weed of disturbed places and cultivated fields.
About this Species
Imperata cylindrica, or alang-alang, is regarded as a very serious weed in tropical countries. It spreads by scaly rhizomes and can invade and over-run any disturbed ecosystem, including cultivated fields. It is very difficult to eradicate.
Geography & Distribution
Alang-alang is native to Asia, Micronesia, Australasia, Europe, southeast USA, Mexico and Africa and is estimated to cover 2,000,000 square kilometres (including natural grasslands) throughout the tropics.
Imperata cylindrica is perennial, with basal leaves 3-100 cm long, 2-20 mm wide and stiff with scabrous leaf-blade margins. The flowering head is loosely cylindrical with abundant white silky hairs concealing the flowering parts.
Alang-alang is used in land reclamation and for soil erosion control on account of its vigorous, rhizomatous habit. However, these same characteristics make it a serious invasive species in pastures, abandoned cultivation and deforested areas throughout the tropics and subtropics and is considered by IUCN’s Invasive Species Specialist Group as one of the world's worst weeds.
The stems of Imperata cylindrica are used as thatch, the stems and leaves for making ropes, and its fibres are used to make paper. In southeast Asia and Africa alang-alang is used in traditional medicine for treating a wide range of ailments.
- Land reclamation
- Soil erosion control
- Traditional medicine
Its rhizome is used for treating blood system disorders, nausea, indigestion and jaundice. In China the rhizome is used as a diuretic, a restorative tonic, and to stop bleeding; in southeast Asia it is used for treating diarrhoea and dysentery. In Namibia, the stems are ground into a powder used as a cosmetic, and also cut into pieces and strung for decorations. Alang-alang is generally regarded as having poor forage value.
Millennium Seed Bank: Seed storage
Kew's Millennium Seed Bank partnership aims to save plant life world wide, focusing on plants under threat and those of most use in the future. Seeds are dried, packaged and stored at a sub-zero temperature in our seed bank vault.
Number of seed collections stored in the Millennium Seed Bank: 10
Seed storage behaviour: Orthodox (the seeds of this plant survive being dried without significantly reducing their viability, and are therefore amenable to long-term frozen storage such as at the MSB)
Germination testing: Successful
References & Credits
Chippendall, L.K.A. & Crook, A.O. (1976). Grasses of Southern Africa. Collins, Salisbury.
Giess, W. & Snyman, J.W. (1986). The Naming and Utilization of Plantlife by the Žu|’hõasi Bushmen of the Kau-kauveld. University of South Africa, Pretoria.
IUCN Invasive Species Specialist Group, Global Invasive Species Database: http://www.issg.org/database
de Padua, L.S., Bunyapraphatsara, N. and Lemmens, R.H.M.J. (eds) (1999). Plant Resources of South-East Asia No. 12(1). Medicinal and poisonous plants 1. Backhuys, Leiden, The Netherlands.
Sen, D.N. (1982). Environment and Plant life in Indian Desert. Geobios International, Jodhpur.
Singh, V. & Singh, P. (1982). Fibre yielding crops of Rajasthan. J. Econ. Tax. Bot. 3: 385-390.
Van Oudtshoorn, F. (1992). Guide to Grasses of South Africa. Briza Publcations, Pretoria.
SEPASAL (Survey of Economic Plants for Arid and Semi-Arid Lands, RBG Kew): http://apps.kew.org/sepasalweb/sepaweb
Watt, J.M. & Brayer-Brandwijk, M.G. (1962). The Medicinal and Poisonous plants of Southern and Eastern Africa. E. and S. Livingstone, Edinburgh.
Wendt, W.B., Stobbs, T.H., Tiley, G.E.D. & Tucker, G.G. (1970). Pasture Handbook: A practical guide for farmers, extension workers and students, to the establishment and management of sown pastures and fodder crops in Uganda. Department of Agriculture, Ministry of Agriculture and Forestry, Entebbe.
Kew Science Editor: Tom Cope
Kew contributors: Sustainable Uses Group
Copy editing: Kew Publishing
Kew would like to thank the following contributors: Elna Irish and Alice Jarvis, National Botanical Research Institute of Namibia.
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