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(Hymenachne amplexicaulis)

Gamba - illustration
  • aquatic or semi-aquatic
  • for seasonally flooded areas
  • used in deep water of ponded pastures
  • very palatable
  • planted from cuttings or seed
  • its use is now restricted in Queensland due to its weed potential.

Hymenachne acutigluma -
1 part of culm with leaves
2. ligule
3. flowering culm
4. two views of a spikelet.

Note. H. acutigluma is widespread thoughout SE Asia and northern Australia



Hymenachne cv. Olive is a robust, rhizomatous perennial grass with thick, succulent creeping stems and broad, green smooth leaves. It can grow up through water 2.5 metres deep. On land, erect stems stand to 1.5 m. It is a valuable native grass in wetlands of south and central America.

Hymenachne has been planted in ponded pasture systems to provide dry season feed; as it complements para grass and aleman grass as it can grow in deeper water.

Hymenachne floats out into deeper water from rooted positions, but does not grow in permanent water, rather it seeds freely and regenerates well in disturbed seed-beds under seasonal flooding.

Hymenachne is well accepted by cattle, and is resistant to the pasture leaf hopper (Toya sp.) that affect para grass.

It produces seed which can be spread by water while broken sements of stem and roots can be also be spread by flowing water or machinery.

Hymenachne can become a potential environmental weed if it becomes established and naturalised in disturbed wet lands.It colonises wetlands especially those with high nutrient levels in sugar cane growing areas and can clog waterways leading to increased flooding.

Hymenachne has become an environmental weed in Florida and its planting and use is now restricted in Queensland.

Creator: Ian Partridge
Date created: 03 April 1998  Revised: 15 January 2003

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