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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New populations have meanwhile appeared within the highly constructed rice growing area, one outside of cultivation, in an abandoned field converting to marsh J.

Blissidae on photosynthesis and growth of Hymenachne amplexicaulis Poaceae. Broue, ; Council of Heads of Australasian Herbaria, The leaves are linear or lance-shaped. Sheldon Navie infestation Photo: Leaf-blade margins scabrous; tuberculate-ciliate; basal margins long-ciliate. In Australia, large, seasonally flooded stands of H.

Seeds prove the highest risk for long distance and new introductions, whether through biotic, climactic, or human mediated means.

Click on images to enlarge infestation Photo: Basal sterile florets barren; without significant palea. They are perennial, sometimes with rhizomes.

Title Shape and form Caption Hymenachne amplexicaulis west indian marsh grass ; upper leaves of emergent stems appear flat and amplexicsulis in silhouette.


Limpograss and hymenachne grown on flatwoods range pond margins. Macroinvertebrates communities were significantly reduced, except for the order Coleoptera, which were more abundant.

Click on images to enlarge Foliage – note characteristic stipules – and emerging seedhead. Views Read Edit View history. The Gardens’ Bulletin Singapore, 20 4: Distribution Top of page Native distribution H. Population Size and Structure Creeping, sprawling and heavily branched populations root in the substrate, with lower culms decumbent and submersed and upper stems erect and emergent.

Glumes Glumes dissimilar; shorter than spikelet; thinner than fertile lemma. Catalogue of New World Grasses Poaceae: An identification manual, Kodansha, Tokyo.

A tetrazolium staining technique had been presented for viability determination in seed of H. A trained botanist having intact, mature spikelets may find them possible to identify using the illustration provided see Images, above and the following characters:.

Ligule a membrane Primarily from Clayton et al. Panicum amplexicaule Rudge Hymenachne acutigluma auct.

Center for Aquatic and Invasive Plants

Atlas of Florida Vascular Amplexicauis. Multifunctional grasslands in a changing world, Volume II: Pohl, ; Kew Herbarium Catalogue, Plants appear to obtain nitrogen from a non-symbiotic association with nitrogen-fixing bacteria or cyanobacteria around the roots and submerged stems, reducing the reliance on fertilisers.


Seeds have the capacity to germinate within 48 hours of their deposition on waterlogged soil.

Pinder L; Rosso S, P levels mostly vary from 0. Distribution Amplexicaupis Top of page The distribution in this summary table is based on all the information available.

Hymenachne – Wikipedia

Low-lying sugarcane fields and their drainage and irrigation systems are at particular risk for invasion in Australia Australian Weeds Committee, as are similar agricultural systems for rice in Brazil Silva et al. Title Spikelets Caption Hymenachne amplexicaulis west indian marsh grass ; lanceolate spikelets appear awned, due to the gradually tapering tip of the lower lemma.

Stem cuttings nodes can be dropped into water over 10 cm deep, or runners planted in rows 5 m apart. Within hymemachne few years, it was noticed that plants had escaped from the constructed wet pasture paddocks through the constructed canals and waterway systems.

Temperature-dependent development, survival, and potential distribution of Ischnodemus variegatus Hemiptera: Hymenachne amplexicaulis new for Louisiana. Indonesia KalimantanMalaysia.