Cyperus difformis (weed)

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Cyperus difformis in Hawaii (click on image to enlarge it)
Author(s): Forest & Kim Starr
Source: Wikimedia Commons

Cyperus difformis (weed) L. - (smallflower umbrella-sedge)

The sedge is a weed of rice in tropical and subtropical regions which can form dense mats and can cause losses of up to 50%. It is mainly a problem in contaminated aerial sown rice. The plant grows to a height of up to 100 cm. The inflorescence is umbrella-shaped and the flowers are greenish brown to purplish and cluster densely to form round flower heads. The plant produce a large number of brown seeds, about ½ mm long, through which it propagates. It grows in flooded or very wet soil, but does not tolerate deep flooding.

Vernacular names
• English: smallflower umbrella-sedge
variable flatsedge
• Français: souchet à petites fleurs
souchet difforme

For details see the respective page in Wikipedia.