Taxon: Hydrilla verticillata (L. f.) Royle

• Check PlantSearch database of Botanic Gardens Conservation International for possible non-NPGS germplasm.

A declared noxious weed by USDA-APHIS.

A declared aquatic or terrestrial noxious weed and/or noxious-weed seed in these U.S. states (see state noxious weed lists), with links to state information or web documents:

ALª*, AZª*°, CAª, COª, CTª, FLª, MAª, MEª, MNª, MSª, NCª, NHª, NMª, NVª, OKª, ORª, PRª, SCª, TXª, VTª, WAª.

ªAquatic.

*Terrestrial.

°In seed.

Link to noxious weed information from

Link to species profile at

Common names:

• Florida-elodea   (Source: Weed CIBA ) – English
  
• hydrilla   (Source: World Econ Pl ) – English
  
• water-thyme   (Source: Weed CIBA ) – English
  
• hei zao   (Source: F ChinaEng ) – Transcribed Chinese
  
• Wasserquirl   (Source: Dict Rehm ) – German
  
• vattenkrans   (Source: Vara kulturvaxt namn ) – Swedish
  

Economic importance:

• Environmental: ornamental   (aquarium plant fide Dict Gard; Invasive Pl Spec)
  
• Medicines: folklore   (fide Herbs Commerce ed2)
  
• Weed: potential seed contaminant   (fide Weed CIBA; Atlas WWeed; Invasive Pl Spec)
  

More:

View ethnobotanical data from Duke's Phytochemical and Ethnobotanical Databases

Distributional range:

• AFRICA
  East Tropical Africa: Kenya; Tanzania; Uganda
  West-Central Tropical Africa: Burundi; Zaire
  West Tropical Africa: Cote D'Ivoire; Ghana
  Western Indian Ocean: Madagascar; Mauritius; Reunion
• ASIA-TEMPERATE
  Western Asia: Afghanistan
  Siberia: Russian Federation - Eastern Siberia, Western Siberia
  Middle Asia: Kazakhstan
  China: China
  Eastern Asia: Japan; Korea
• ASIA-TROPICAL
  Indian Subcontinent: Bangladesh; Bhutan; India; Nepal; Pakistan; Sri Lanka
  Indo-China: Myanmar; Thailand; Vietnam
  Malesia: Indonesia; Malaysia; Papua New Guinea; Philippines
• AUSTRALASIA
  Australia: Australia
• EUROPE
  Northern Europe: Ireland
  Middle Europe: Germany; Poland
  East Europe: Belarus; Latvia; Lithuania
  Southeastern Europe: Italy

• AFRICA
  Macaronesia: Spain - Canary Islands
• AUSTRALASIA
  New Zealand: New Zealand
• NORTHERN AMERICA
  Mexico
  United States
• PACIFIC
  Northwestern Pacific: Guam
  Southwestern Pacific: Fiji; New Caledonia
• SOUTHERN AMERICA
  South America

• also cultivated

• exact native range obscure

References:

• Acevedo-Rodríguez, P. & M. T. Strong. 2012. Catalogue of seed plants of the West Indies. Smithsonian Contr. Bot. 98.
• Aldén, B., S. Ryman & M. Hjertson. 2009. Våra kulturväxters namn - ursprung och användning. Formas, Stockholm (Handbook on Swedish cultivated and utility plants, their names and origin).
• Bosser, J. M. et al., eds. 1976–. Flores des Mascareignes.
• CIBA-GEIGY, Basel, Switzerland. Documenta CIBA-GEIGY (Grass weeds 1. 1980, 2. 1981; Monocot weeds 3. 1982; Dicot weeds 1. 1988)
• Center for Aquatic and Invasive Plants. Florida state list aquatic & wetland noxious weeds - from Department of Environmental Protection (on-line resource).
• Conant, P. et al. 1997. Appendix. Selected plant species interfering with resource management goals in North American natural areas. In: Luken, J. O. & J. W. Thieret, eds., Assessment and management of plant invasions. 255–267.
• Davidse, G. et al., eds. 1994. Flora mesoamericana.
• Euro+Med Editorial Committee. Euro+Med Plantbase: the information resource for Euro-Mediterranean plant diversity (on-line resource).
• FNA Editorial Committee. 1993–. Flora of North America.
• George, A. S., ed. 1980–. Flora of Australia.
• Haynes, R. R. & L. B. Holm-Nielsen. 1985. A generic treatment of Alismatidae in the Neotropics with special reference to Brazil. Acta Amazon. suppl. 15:170.
• Holm, L. et al. 1979. A geographical atlas of world weeds.
• Huxley, A., ed. 1992. The new Royal Horticultural Society dictionary of gardening.
• Institute of Pacific Islands Forestry. Pacific Island Ecosystems at Risk (PIER): plant threats to Pacific ecosystems (on-line resource).
• Kartesz, J. T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland.
• Krasnoborov, I. M., ed. 2000–. Flora of Siberia (English translation).
• Langeland, K. A. 1996. Hydrilla verticillata (L.F.) Royle (Hydrocharitaceae) The perfect aquatic weed. Castanea 61:293–304.
• Lazarides, M. & B. Hince. 1993. CSIRO Handbook of Economic Plants of Australia.
• McGuffin, M., J. T. Kartesz, A. Y. Leung, & A. O. Tucker. 2000. Herbs of commerce, ed. 2.
• Rehm, S. 1994. Multilingual dictionary of agronomic plants.
• Turrill, W. B. et al., eds. 1952–. Flora of tropical East Africa.
• USDA National Agricultural Library. National Invasive Species Information Center (on-line resource).
• Weber, E. 2003. Invasive plant species of the world: a reference guide to environmental weeds.
• Wu Zheng-yi & P. H. Raven et al., eds. 1994–. Flora of China (English edition).

More:

Search AGRICOLA article citation database for citations referencing Hydrilla verticillata.

Search NCBI's Entrez search engine for PubMed citations referencing Hydrilla verticillata.

Search Biodiversity Heritage Library for historical publications referencing Hydrilla verticillata.

Check other web resources for Hydrilla verticillata (L. f.) Royle:

• Flora of North America: Collaborative Floristic Effort of North American Botanists
• PLANTS: USDA-NRCS Database of Plants of the United States and its Territories
• BONAP: North American Plant Atlas of the Biota of North America Program
• Flora of China: Online version from Harvard University
• AVH: Australia's Virtual Herbarium
• ABRS: Australian Biological Resources Study Flora of Australia online
• TROPICOS: Nomenclatural and Specimen Database of the Missouri Botanical Garden
• Mansfeld: Mansfeld's World Database of Agricultural and Horticultural Crops
• ePIC: Electronic Plant Information Centre of Royal Botanic Gardens, Kew
• AGRICOLA: Article Citation Database or NAL Catalog of USDA's National Agricultural Library
• Entrez: NCBI's search engine for PubMed citations, GenBank sequences, etc.

Images:

• Disseminule drawings: U.S. National Seed Herbarium drawing
• Forestry Images: from www.forestryimages.org
• Fruit and seed: U.S. National Seed Herbarium image
• Seed: U.S. National Seed Herbarium image

More:

• Check PlantSystematics.org for additional images
• Images Note: Be advised that their identity may be inaccurate. Proper identification of a plant may require specialized taxonomic knowledge or comparison with properly documented herbarium material.

Abbreviations & symbols in GRIN Taxonomy

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