Cyperus iria L.

Cyperus iria L.





Vernacular Names

Indonesia Babawangan (Sundanese), rumput jekeng kungit (Javanese), rumput silupak (Sumatra).
Philippines Sud-sud, alinang (Bikol), okokiang (Bontok).
Thailand Kok huadaeng (Singburi), yaa kok saai (Nakhon Sawan), yaa kok lek (Ang Tong).
Vietnam c[os]i g[aj]o.

Geographical Distributions

Cyyperus iria is distributed from Iran, Afghanistan, China and Japan to Australia. C. iria also an important and widespread weed in eastern Africa; as well as a common weed throughout Indo-China, Thailand and Malesia. It also have been introduced and naturalised in the south-eastern United States and the West Indies.



C. iria is a tufted annual or sometimes perennial herb. C .iria are with fibrous also with yellowish-red in colour of roots while its stem is  with a size measuring about (5-)15-50(-80) cm long.

The leaves are measuring about 3-6(-8) mm wide, flat or channeled and scabrid on the margins in the upper part.

The inflorescence is simple or compound, and  up to measure about 40 cm long and with 3-5(-7) involucral bracts. The primary rays are 3-5(-8), very unequal, and with a size up to measure about 10(-18) cm long, spicately arranged spikelets and with 6-20(-24)-flowered. There are 2-3 stamens and 3 stigmas.

The fruit is triquetrous, obovoid or ellipsoid in shape and it is dark brown to black shining in colour.


Ecology / Cultivation

C. iria occurs up to 700(-1200) m altitude in open wet locations and is a characteristic and common weed in lowland rice fields, but it may also occur as a weed in vegetables, maize, sugar cane, groundnut and soya bean. C. iria also occurs on along a roadsides and a river banks. It is able flowers throughout the year.


Line Drawing / Photograph



  1. Plant Resources of South-East Asia No. 12 (1): Medicinal and poisonous plants 1.