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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Vegetative material may be less likely to be transported, but is easier to recognize. Plants growing in resource rich environments, however, such as deep floodplains ampleixcaulis high nutrient runoff, can sustain damage by I.

The insect species proved to be host specific to H. Panicum amplexicaule Rudge Panicum amplexicaule var. In Australia, efforts continue to reduce the spread of H.

Rafts of plant material have been moved by water flow, until lodging against a bank and taking root. This plant reproduces by seed and also vegetatively via stem fragments.

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

The two amplexicaulos similar in growth habit and nearly alike in floral features. It is also quite common in sugar-growing areas, where it is occasionally known to invade plantations. Hymenachne or Olive hymenachne Hymenachne amplexicaulis. Weed Science Society of Victoria Inc. Care should also be taken that hymenachn used pose no environmental threat, and are registered for use in the intended manner.

International Common Names English: University hymenachns Florida, pp. Repeated applications of foliar spray may be necessary to control dense infestations. Repeated applications of high volume foliar spray may be necessary to control dense infestations, since, although tops might be killed by a single application, stands recover from stolons and seed within 3 months.

Robust perennial grass from stolons. Native communities remain especially common along the Pacific and Atlantic coastal zones of the neo-tropics at low elevations up to m above sea level. Built on data for climate, distribution, and connectivity of drainage systems, the models were consistent in identifying a number of catchments of high invasion risk or spread in northern, central and southern Australia to which the directing of management priority has been suggested Wearne et al.


As a declared weed across Australia, H. Long-lived perennial populations persist through rooted basal portions and rhizomes. They hymdnachne distinguished by observable differences in their gross anatomy, H. Title Shape and form Caption Hymenachne amplexicaulis west indian marsh grass ; aquatic hymenachn produce upright, emergent culms from submersed, rooting stolons.

Glumes dissimilar; shorter than spikelet; thinner than fertile lemma. These restrictions may prevent the use of one or more of the methods referred to, depending on individual circumstances. It has low drought tolerance, not spreading beyond the wet zone, and low salt tolerance, not surviving even occasional tidal amplexiczulis.

Leaf blades flat, to 35 cm 14 in long and to 4 cm 1. Australian Department of Agriculture, University of Florida Herbarium Collections Catalog.

This species grows best under fluctuating systems of shallow water up to 1. The imbibition of seeds without glumes, for six hours, with subsequent immersion in a solution of tetrazolium 0.

The plant is a highly valued forage in its native range in Mexico, Cuba and Venezuela Diaz et al. The species has shown to be valuable to cattle production in ponded pasture systems in Queensland and on alluvial flood plains of Northern Territory, Australia.

Fact sheet – Hymenachne amplexicaulis

It is proposed as a nutrient sink and sediment trap in situations polluted by habitation and cultivation.

The small ‘seed’ i. Creeping, sprawling and heavily branched populations root in the substrate, with lower culms decumbent and submersed and upper stems erect and emergent.

Sheldon Navie close-up of base of leaf blade Photo: Upper glume lanceolate; 2. Producers indicated that H. Appearance Robust perennial grass from stolons. Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension.

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Pohl RW; Davidse G, Spikelets Fertile spikelets pedicelled, pedicels oblong. Feeding effects of Ischnodemus variegatus Hemiptera: Physiological adaptations of Hymenachne amplexicaulis to flooding. Methodology adequation of tetrazolium test for Hymenachne amplexicaulis seeds. While every care is taken to ensure the accuracy of this information, DEEDI does not invite reliance upon it, nor accept responsibility for any loss or damage caused by actions based on it. Biological Control, 57 2: By the s, however, spread was notably expanding to new counties and associated problems were being reported, initially in ditches and ponds of the sugarcane growing regions south of Lake Okeechobee, then in the canals, creeks and bays westward Langeland et al.

Hymenachne control

While generally readily eaten by cattle and buffaloes, even when mature, it is not as palatable as Brachiaria mutica or Echinochloa polystachya.

Risk and Impact Factors Top of page Invasiveness Invasive in its native range Proved invasive outside its native range Has a broad native range Abundant in its native range Highly adaptable to different environments Pioneering in disturbed areas Highly mobile locally Benefits from human association i. Laboratory studies found that it developed and survived best on H.

Macroinvertebrates communities were significantly reduced, except for the order Coleoptera, which were more abundant. In Western Australia, legislation directs not only exclusion, but control, including searches at border patrols, to prevent first entry and establishment. From Wikipedia, the free encyclopedia. The leaves consist of a hairless i.