Hymenachne amplexicaulis is occasionally found growing in wet pastures from the central peninsula to Collier county. It is native to the West Indies and blooms. hymenachne, west indian marsh grass, water straw grass, trompetilla or trumpet grass, canutillo (Colombia); dal (dhal) grass, bamboo grass (India); carrizo chico . Hymenachne (Hymenachne amplexicaulis) is an invasive plant in Queensland. Hymenachne is a restricted plant under Queensland legislation.

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Appearance Robust perennial grass from stolons.

When flooded, submerged leaves senesce rapidly, but nodes produce adventitious roots and the growth of leaves increases, presumably maintaining the effective photosynthetic leaf area Kibbler and Bahnisch, In Australia, efforts continue to reduce the spread of H.

The control methods referred to in this fact sheet should be used in accordance with the restrictions federal and state legislation, and local government laws directly or hymejachne related to each control method.

Temperature-dependent development, survival, and potential distribution of Ischnodemus variegatus Hemiptera: Biological control An effective biological control agent has not been determined for H.

Weeds of Australia – Biosecurity Queensland Edition Fact Sheet

Fruit 3—4 mm 0. Seed can be broadcast onto wet soil, or onto shallow water, with seedlings emerging as the pond dries out.

An effective biological control agent has not been determined for H. Means amplexiczulis Movement and Dispersal Top of page Natural dispersal Seed and stem fragments may be dispersed by water movement. Not usually planted with legumes.

They may be known commonly as marsh grasses. Evidence for herbaceous seed dispersal by small-bodied fishes in a Pantanal seasonal wetland.



Biology and Ecology Top of page Genetics Chromosome number: Pohl RW; Davidse G, The paddy bug Oebalus poecilus and O. It is native to Central and South America, where populations have increased around human disturbance.

Within one year plants has spread south to enter New South Wales, along the northern coastal zone, just north of Coffs Harbour Amplexiculis of Heads of Australasian Herbaria, Click on images to enlarge. Palea separating from lemma above; involute; 1 length of lemma; cartilaginous; 2-veined; without keels.

Application of glyphosate followed by burning of dead tops can give significant control, providing mature seed has not dropped before treatment. Diagnostic features of the genus Hymenachne include its aquatic habit and lower internodes filled with spongy aerenchyma, the cylindrical inflorescence, the margins of the upper lemma being flat and the glumes not saccate Ampkexicaulis, Planta Daninha, 30 4: P levels mostly vary from 0. It is spreading throughout the tropical wetlands of northern Australia and is most common in the coastal districts of northern Queensland and the Northern Territory.

Nitrogen fixation rates are believed to be higher in newly established stands compared with mature stands, which draw nutrient from litter decomposition and mineralisation, and eutrophication.

Title Shape and form. Soon after new invasions were documented all along the Queensland nymenachne zone and were identified in the Northern Territory. In the Fitzroy River backwaters of central Queensland, Australia, the replacement of extensive zones of floating-attached and submergent native vegetation by monoculture stands of H.

Developing solutions to evolving weed problems. A revised handbook to the flora of Ceylon. Populations have been known to remain growing and rooted in depths of 3 m for at least nine months, yet higher water levels, such as during flooding, will induce rhizomes to break and form free floating mats Australian Department of Agriculture, Natural Heritage Trust, N and P fertilisers applied at the beginning of the wet season have little effect on dry matter yield, or CP or P levels in the plant in the long term.


It can be grown for pasture in natural or artificially inundated pondage areas. Hymenachne amplexicaulis west indian marsh grass ; aquatic plants produce upright, emergent culms from submersed, rooting stolons.

It is native to Central In Australia, it is prohibited as a Class hymenachn Declared Pest and named a Weed of National Significance for its proven potential to invade wet areas across a wide geographic range. Blissidae on two congeneric grass species. Australian Weeds Committee, Primarily from Clayton amplexiccaulis al. Retrieved 21 January Stolon removed from wetland area.

Hymenachne amplexicaulis – UF/IFAS Center for Aquatic and Invasive Plants

Within a few years, it was noticed that plants had escaped from the constructed wet pasture paddocks through the constructed canals and waterway systems. Hymenachne amplexicaulis west indian marsh grass ; stem-clasping leaf base with long, ciliate hairs along the margin of the clasping lobe. Plants reportedly grow to a height of 2.