Click on an acronym to view each weed list, or click here for a composite list of Weeds of the U.S. This plant can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. Characteristics very similar to the American waterweed (E. canadensis) The following website contains photos and descriptions of hydrilla and similar species: Nonnative Fresh Water Plant: Hydrocharitaceae- Washington State Department of Ecology Colle and Shireman (1980) found reduced weight and size in sportfish when hydrilla occupied the majority of the water column, suggesting that foraging efficiency was reduced … This species is often rooted, although it can break loose and form a free-floating state (Langeland 1996). Hydrilla is able to dominate a body of water rapidly through its photosynthetic characteristics (Van, Haller, and Bowes 1976; et al. The plant’s aggressive growth (hydrilla’s 20 – 30 foot stems can add up to an inch per day) can spread into shallow water areas and form thick mats that block sunlight to native plants below, effectively displacing the native vegetation of a waterbody. …an immensely accomplished artist with a huge sound and a way of playing that is lyrical and intense without a hint of preciousness. is a submersed perennial monocotyledon plant from southeast Asia (Cronk and Fennessy 2001). Major colonies of hydrilla can alter the physical and chemical characteristics of lakes: It is a tenacious weed that has several ways to propagate: seeds, plant fragments, tubers, and turions (a type of bud). Hydrilla (waterthyme) is a genus of aquatic plant, usually treated as containing just one species, Hydrilla verticillata, though some botanists divide it into several species.It is native to the cool and warm waters of the Old World in Asia, Africa and Australia, with a sparse, scattered distribution; in Australia from Northern Territory, Queensland, and New South Wales. Long story short, it and any aquatic plant would make good compost, just know what you are dealing with. Hydrilla has mid rib teeth that causes the plant to feel rough when drawn through your hand, also you may want to go to Texas A&M AgriLife Aquaplant website for more info and identification pictures and explanations. Hydrilla has been shown to alter the physical and chemical characteristics of lakes. It has long stems that branch at the surface where growth becomes horizontal and dense mats form. An invasive aquatic plant recently found in several counties, hydrilla could impact New York’s fishing, 2. often forming impenetrable mats of vegetation. Early detection of hydrilla could save the state millions in control costs. Hydrilla generally grows rooted into substrate, but the plant is easily fragmented and it will also survive as a free floating mat at the water surface. It was introduced to Florida in the 1950s through the aquarium trade. Identification: Hydrilla verticillata . Hydrilla once was used as an aquarium plant, and has become a weed of economic importance. Hydrilla closely resembles two other aquatic plants found in Washington: The non-native plant Brazilian elodea – Egeria densa and the native plant American waterweed – Elodea canadensis. 1977), combined with several very efficient methods of vegetative reproduc­ tion, i.e., through runners over the surface of bottom muds and through Stems can be more than 35 feet long. 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