You are here
Species
Hydrilla verticillata (L. f.) Royle
IUCN
NCBI
EOL Text
Hydrilla, Hydrilla verticillata, is an aquatic weed not native to Florida but widespread within the state. It is a submerged, rooted (usually) perennial with long, sinewy branching stems that often reach the surface and form dense mats. The stems are covered in small, pointed, often serrate leaves arranged in 4-8 whorls. Leaf midribs are often reddish with one or more sharp spines. Small pale subterranean tubers occur attached to the roots. Small white flowers grow above the water line on stalks (Godfrey and Wooten 1979, Illinois-Indiana Sea Grant College Program undated).H. verticillata exhibits a degree of penotyoic plasticity (variable physical appearance) in response to age, habitat conditions, and water quality (Kay 1992). Branching is generally sparse in submerged portions of the plant, tending to become profuse at the surface (Langeland 1996).
| License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
| Rights holder/Author | Text can be freely copied and altered, as long as original author and source are properly acknowledged. |
| Source | http://www.sms.si.edu/irlspec/Hydrilla_verticillata.htm |
In Florida, Hydrilla may be easily mistaken for a related (confamilial) non-native aquatic weed Egeria densa with which it co-occurs in much of the state. The leaves of E. densa occur in whorls of 3-6 and have very fine serrations that can only be discerned under magnification.Hydrilla can also be confused with a native aquatic plant, Elodea canadensis, although this species only occurs in northernmost Florida.
| License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
| Rights holder/Author | Text can be freely copied and altered, as long as original author and source are properly acknowledged. |
| Source | http://www.sms.si.edu/irlspec/Hydrilla_verticillata.htm |
Red List Criteria
Year Assessed
Assessor/s
Reviewer/s
Contributor/s
| License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
| Rights holder/Author | © International Union for Conservation of Nature and Natural Resources |
| Source | http://www.iucnredlist.org/apps/redlist/details/167871 |
United States
Origin: Exotic
Regularity: Regularly occurring
Currently: Unknown/Undetermined
Confidence: Confident
Habitat and Ecology
Systems
- Freshwater
| License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
| Rights holder/Author | © International Union for Conservation of Nature and Natural Resources |
| Source | http://www.iucnredlist.org/apps/redlist/details/167871 |
United States
Rounded National Status Rank: NNA - Not Applicable
"
Global Distribution
Asia, Europe and Africa
Indian distribution
State - Kerala, District/s: All Districts
"
"Systems: It is locally common in rivers and ponds. This species is hardy and tolerant to heavy metals. Many studies have investigated the ecological role of this species in polluted waters (i.e., Wang et al. 2007, Bao 2008, Huang et al. 2009). List of Habitats: Freshwater"
| License | http://creativecommons.org/licenses/by/3.0/ |
| Rights holder/Author | "Molur et al, 2011", IUCN and ZOO 2011, India Biodiversity Portal |
| Source | http://indiabiodiversity.org/species/show/259142 |
Rounded Global Status Rank: GNR - Not Yet Ranked
"Range Description: Widespread from the temperate and tropical regions of the Eastern Hemisphere. It is considered an noxious plant in the USA and has been introduced in many European countries. This aquatic plant is believed to be native to Africa, south and southeast Asia. Countries - Native: Afghanistan; Bangladesh; Belarus; Bhutan; Burundi; Cambodia; China (Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hebei, Heilongjiang, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Shaanxi, Shandong, Sichuan, Tibet [or Xizang], Yunnan, Zhejiang); Congo, The Democratic Republic of the; Estonia; Hong Kong; India; Indonesia (Jawa, Maluku, Sulawesi, Sumatera); Iran, Islamic Republic of; Ireland; Japan (Nansei-shoto); Kazakhstan; Kenya; Korea, Republic of; Lao People's Democratic Republic; Lithuania; Malaysia (Peninsular Malaysia, Sabah, Sarawak); Myanmar; Nepal; Papua New Guinea; Philippines; Russian Federation (Altay, Amur, Irkutsk, Khabarovsk, Krasnoyarsk, Primorye, West Siberia); Rwanda; Sri Lanka; Taiwan, Province of China; Tanzania, United Republic of; Thailand; Uganda; United Kingdom; Viet Nam; Zambia Introduced: Austria; Germany; Hungary; Italy; Spain (Canary Is., Spain (mainland)); United States; Present - origin uncertain:Latvia; Poland"
| License | http://creativecommons.org/licenses/by/3.0/ |
| Rights holder/Author | "Molur et al, 2011", IUCN and ZOO 2011, India Biodiversity Portal |
| Source | http://indiabiodiversity.org/species/show/259142 |