Plantae > Tracheophyta > Liliopsida > Alismatales > Hydrocharitaceae > Hydrilla > Hydrilla verticillata

Hydrilla verticillata (waterthyme)

Synonyms: Elodea verticillata; Epigynanthus blumei; Hydora lithuanica; Hydrilla angustifolia; Hydrilla dentata; Hydrilla dentata var. pomeranica; Hydrilla lithuanica; Hydrilla najadifolia; Hydrilla ovalifolia; Hydrilla polysperma; Hydrilla roxburghii; Hydrilla subulata; Hydrilla verticillata var. brevifolia; Hydrilla verticillata var. crispa; Hydrilla verticillata var. roxburghii; Hydrilla verticillata var. tenuis; Hydrilla wightii; Hydrospondylus submersus; Ixia aquatica; Serpicula verticillata; Udora lithuanica; Udora occidentalis; Udora pomeranica; Udora verticillata; Vallisneria verticillata

Wikipedia Abstract

Hydrilla (Esthwaite Waterweed, waterthyme or hydrilla) 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, Europe, Africa and Australia, with a sparse, scattered distribution; in Europe, it is reported from Ireland, Great Britain, Germany, and the Baltic States, and in Australia from Northern Territory, Queensland, and New South Wales.
View Wikipedia Record: Hydrilla verticillata

Invasive Species

Hydrilla verticillata is a submerged freshwater aquatic weed that can tolerate salinity up to 7%. It crowds out native plants by shading them and out-competing them for nutrients. The dense masses it forms interfere with recreational activities such as boating, fishing and swimming. Hydrilla verticillata can be dispersed by river flow, waterfowl and recreational activities and is sold as an aquarium plant.
View ISSG Record: Hydrilla verticillata


Width [2]  6.6 feet (2 m)
Light Preference [3]  Mixed Sun/Shade
Soil Acidity [3]  Strong Base
Soil Fertility [3]  Mostly Infertile
Soil Moisture [3]  Submerged
Flower Type [2]  Monoecious
Leaf Type [1]  Evergreen
Lifespan [2]  Annual/Perennial
Pollinators [2]  Water
Structure [4]  Herb
Usage [2]  The plant is used in sugar refinery; No more details are given.
View Plants For A Future Record : Hydrilla verticillata

Protected Areas

Name IUCN Category Area acres Location Species Website Climate Land Use
Arun Valley 1205 England, United Kingdom
Big Cypress National Preserve V 732120 Florida, United States
Dorset Heaths (Purbeck and Wareham) and Studland Dunes 5491 England, United Kingdom
Dungeness 7966 England, United Kingdom
Everglades and Dry Tortugas Biosphere Reserve   Florida, United States  
Kakadu National Park II 4744348 Northern Territory, Australia
Llangorse Lake/ Llyn Syfaddan 533 Wales, United Kingdom  
Lower Derwent Valley 2263 England, United Kingdom
Minsmere to Walberswick Heaths and Marshes 3127 England, United Kingdom
Morecambe Bay Pavements 6449 England, United Kingdom
Nene Washes 218 England, United Kingdom
Pevensey Levels 8860 England, United Kingdom  
Razna 147312 Latvia  
River Derwent and Bassenthwaite Lake 4529 England, United Kingdom
River Eden 6087 England, United Kingdom  
River Wye/ Afon Gwy 5523 England/Wales, United Kingdom  
Sikhote-Alinskiy Biosphere Reserve 978001 Russia  
Silene 9452 Latvia  
Stodmarsh 1395 England, United Kingdom
The New Forest 72309 England, United Kingdom
Thursley, Ash, Pirbright and Chobham 12696 England, United Kingdom
Tortuguero National Park II 47632 Costa Rica



Ctenopharyngodon idella (silver orfe)[5]
Irediparra gallinacea (Comb-crested Jacana)[6]
Pangshura tecta (Indian Roofed Turtle)[7]
Parapoynx diminutalis (Hydrilla leafcutter moth)[8]
Pseudemys concinna concinna (Eastern river cooter)[9]
Pseudemys concinna floridana (Common cooter)[9]
Pseudemys nelsoni (Florida Redbelly Turtle)[9]
Pseudemys texana (Texas River Cooter)[10]
Trichechus manatus (West Indian Manatee)[11]
Chelydra serpentina (Common Snapping Turtle)[12]
Lymnaea stagnalis (swamp lymnaea)[12]


Shelter for 
Aedes albopictus (forest day mosquito)[12]
Ambystoma maculatum (Spotted Salamander)[12]
Ameiurus natalis (Yellow bullhead)[12]
Anax junius (green darner)[12]
Anguilla rostrata (American eel)[12]
Calopteryx maculata (Ebony jewelwing)[12]
Corydalus cornutus (dobsonfly)[12]
Dolomedes triton (Six-spottedfishingspider)[12]
Gambusia holbrooki (Bore-drain fish)[12]
Ischnura posita (Fragile forktail)[12]
Lampsilis radiata (eastern lampmussel)[12]
Libellula lydia (Common whitetail)[12]
Limnodrilus hoffmeisteri (Aquatic worm)[12]
Lithobates catesbeianus (American Bullfrog)[12]
Micropterus salmoides (Northern largemouth bass)[12]
Nerodia sipedon (Northern Water Snake)[12]
Notemigonus crysoleucas (Golden shiner minnow)[12]
Pomoxis nigromaculatus (Strawberry bass)[12]
Procotyla fluviatilis (Flatworm)[12]
Semotilus atromaculatus (Horned dace)[12]
Chelydra serpentina (Common Snapping Turtle)[12]
Lymnaea stagnalis (swamp lymnaea)[12]


E. Europe to Asia, Uganda to N. Zambia; Old World;



Attributes / relations provided by
1Kattge, J. et al. (2011b) TRY - a global database of plant traits Global Change Biology 17:2905-2935
2Plants For A Future licensed under a Creative Commons License
3ECOFACT 2a Technical Annex - Ellenberg’s indicator values for British Plants, M O Hill, J O Mountford, D B Roy & R G H Bunce (1999)
4USDA Plants Database, U. S. Department of Agriculture
5Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
6Dostine, P. L., & Morton, S. R. (2000). Seasonal abundance and diet of the comb-crested Jacana Irediparra gallinacea in the tropical Northern Territory. Emu-Austral Ornithology, 100(4), 299-311.
7Seasonal Variation in Feeding Behaviour of Indian Roofed Turtle, Pangshura tectum in Bangladesh, Md. Lokman Hossain, Shorab Uddin Sarker and Noor Jahan Sarker, Saudi Journal of Biological Sciences 15 (1) 53-58 June 2008
8Parapoynx diminutalis Snellen (Insecta: Lepidoptera: Crambidae), Julie Baniszewski, Emma N. I. Weeks, James P. Cuda, University of Florida, January 2014
9Dietary Overlap in Three Sympatric Congeneric Freshwater Turtles (Pseudemys) in Florida, Karen A. Bjorndal, Alan B. Bolten, Cynthia J. Lagueux and Dale R. Jackson, Chelonian Conservation Biology, 1997, 2(3):430-433
10Food Habits and Selective Foraging by the Texas River Cooter (Pseudemys texana) in Spring Lake, Hays County, Texas, JACQUELINE R. FIELDS, THOMAS R. SIMPSON, RICHARD W. MANNING, AND FRANCIS L. ROSE, Journal of Herpetology, Vol. 37, No. 4, pp. 726–729, 2003
11Consumption of Aquatic Plants by the West Indian Manatee, Kay Etheridge, G. B. Rathbun, J. A. Powell, and H. I. Kochman, J. Aquat. Plant Manage. 23: 21-25 (1985)
12Study of Northern Virginia Ecology
Protected Areas provided by GBIF Global Biodiversity Information Facility
Biological Inventories of the World's Protected Areas in cooperation between the Information Center for the Environment at the University of California, Davis and numerous collaborators.
Natura 2000, UK data: © Crown copyright and database right [2010] All rights reserved. Ordnance Survey Licence number 100017955
Images provided by Wikimedia Commons licensed under a Creative Commons License
Abstract provided by DBpedia licensed under a Creative Commons License
Weather provided by NOAA METAR Data Access