You are here
Species
Hydrilla verticillata (L. f.) Royle
IUCN
NCBI
EOL Text
Hydrilla first appeared in the Crystal River system of Florida in 1960. Imported by the aquarium trade, its presence on the Delmarva Peninsula was confirmed in 1981. It attracted national attention when infestations were found in the Potomac River in Washington, D.C. in the early 1980s. It is a federal noxious weed.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | U.S. National Park Service |
Source | http://www.nps.gov/plants/alien/pubs/midatlantic/hyve.htm |
Caulescent, glabrous, profusely branched freshwater herb with 5-50 mm long internodes and fibrous roots at some nodes. Leaves oblong-linear to lanceolate, (8-) 10-40 (-50) mm long, (1-) 2-3 mm wide, green, margin serrate-dentate, apex acute-apiculate; nodal scales 2, axillary, membranous with orange brown cilia on margin. Male spathe 1.25-1.50 mm long, bursting open to liberate male flower, beset with subulate appendages. Male flower: sepals reflexed, 1.5-3 mm long; petals linear-spathulate, equalling the sepals, patent or reflexed, obtuse; stamens with minute filaments. Female spathe c. 5 mm long, reddish-brown striped, bidentate. Ovary oblong, 3.4 mm long, with 1.5-10 cm long slender rostrum. Fruit ± terete. 5-7 mm long. Seeds dark brown, c. 2.5 mm long.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
Source | http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=200024721 |
Flowering summer--fall.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
Source | http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=200024721 |
Physical, chemical and biological controls have been used for control of hydrilla, with varying levels of success. Water level drawdowns have generally been ineffective in our area. Mechanical aquatic weed harvesters provide temporary relief and open boating lanes, but resulting plant fragments can help spread the vegetation faster. Contact herbicides provide temporary control, but systemic herbicides provide more long-term control. Herbivorous fish such as sterile grass carp have been used for hydrilla control where allowed by law. Other biological controls are still being investigated. Each control method has its drawbacks and liabilities. On the Potomac River and other parts of the Chesapeake Bay watershed, resource managers struggle with hydrilla because submerged aquatic vegetation, including hydrilla, provides water quality benefits and habitat for fish and shellfish.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | U.S. National Park Service |
Source | http://www.nps.gov/plants/alien/pubs/midatlantic/hyve.htm |
Hydrilla verticillata (L. f.) Royle, 1839
Materials
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; stateProvince: Kachin; verbatimLocality: Tanaing Township; verbatimLatitude: 26° 22' 22'' N; verbatimLongitude: 96° 43' E; Event: eventDate: Sep. 15, 2005 ; Record Level: collectionID: MBK040056; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; stateProvince: Shan State; locality: Pindaya ; verbatimLatitude: 20° 59' 57" N; verbatimLongitude: 96° 39' 59" E; Record Level: collectionID: MBK080634; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; locality: Mandalay Division ; verbatimLatitude: 22° 00' 29'' N; verbatimLongitude: 96° 28' 06'' E; Event: eventDate: Jan. 11, 2002 ; Record Level: collectionID: Tanaka et al. 021712; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; locality: Mandalay Division ; verbatimLatitude: 20° 48' N; verbatimLongitude: 95° 15' E; Event: eventDate: Mar. 4, 2003 ; Record Level: collectionID: Tanaka et al. 028704; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; locality: Bago Division ; verbatimLatitude: 18° 42' 22'' N; verbatimLongitude: 95° 5' 59'' E; Event: eventDate: Dec. 9, 2006 ; Record Level: collectionID: Sugawara et al. 036433; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; locality: Kachin State ; verbatimLatitude: 26° 6' 34'' N; verbatimLongitude: 96° 42' 58'' E; Event: eventDate: Sep. 19, 2005 ; Record Level: collectionID: Tanaka et al. 040483; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; locality: Shan State ; verbatimLatitude: 20° 35' 41'' N; verbatimLongitude: 96° 31' 46'' E; Event: eventDate: Nov. 26, 2008 ; Record Level: collectionID: Tanaka et al. 080050; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; locality: Shan State ; verbatimLatitude: 20° 35' 41'' N; verbatimLongitude: 96° 31' 46'' E; Event: eventDate: Nov. 26, 2008 ; Record Level: collectionID: Tanaka et al. 080057; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; locality: Shan State ; verbatimLatitude: 20° 27' 28'' N; verbatimLongitude: 96° 50' 37'' E; Event: eventDate: Dec. 4, 2008 ; Record Level: collectionID: Tanaka et al. 080663; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; locality: Taunngyi ; verbatimLatitude: 20° 47' 14" N; verbatimLongitude: 97° 2' 7" E; Event: eventDate: Jan. 5, 1938 ; Record Level: collectionID: F.G. Dickason 9334; institutionCode: GH
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Thailand ; locality: Chiang Mai Province; Chiang Dao District ; verbatimLatitude: 19° 28' 46" N; verbatimLongitude: 98° 54' 44" E; Event: eventDate: Dec. 11, 1992 ; Record Level: collectionID: V.A. Sunthorn, P. Palee 101; institutionCode: GH
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Thailand ; verbatimLatitude: 13° 45' 10" N; verbatimLongitude: 100° 29' 45" E; Record Level: collectionID: T- 50413 [TI]; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Thailand ; locality: Pha Team National Park, Ubon Ratchathani, Thailand ; verbatimLatitude: 15° 24' 07'' N; verbatimLongitude: 105° 29' 20'' E; Record Level: collectionID: Tr. Tanaka; institutionCode: TNS
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Thailand ; locality: Hotel river Kwai, Kantchanabury ; verbatimLatitude: 14° 1' 59" N; verbatimLongitude: 99° 31' 10" E; Event: eventDate: Nov. 15, 2012 ; Record Level: collectionID: Y. Ito 1724; institutionCode: BKF
Distribution
Bangladesh, Bhutan, China (nationwide), Indonesia (nationwide), Japan, Malaysia (nationwide), Myanmar, Nepal, Pakistan, Papua New Guinea, Thailand, Sri Lanka.
License | Public Domain |
Rights holder/Author | No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation. |
Source | http://treatment.plazi.org/id/080DBBDBB57749418F6620161FEB4CDE |
600-1600 m
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
Source | http://www.efloras.org/florataxon.aspx?flora_id=110&taxon_id=200024721 |
Fl. Per.: October-January.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
Source | http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=200024721 |
Hydrilla outcompetes native submerged aquatic vegetation and can quickly fill a pond or lake, thus choking off the water body for boating, fishing, swimming and other recreational uses. Although non-native and invasive, it provides good quality habitat for fish and shellfish as well as water quality benefits.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | U.S. National Park Service |
Source | http://www.nps.gov/plants/alien/pubs/midatlantic/hyve.htm |
Hydrilla verticillata (L. f.) Royle, 1839
Materials
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; stateProvince: Kachin; verbatimLocality: Tanaing Township; verbatimLatitude: 26° 22' 22'' N; verbatimLongitude: 96° 43' E; Event: eventDate: Sep. 15, 2005 ; Record Level: collectionID: MBK040056; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; stateProvince: Shan State; locality: Pindaya ; verbatimLatitude: 20° 59' 57" N; verbatimLongitude: 96° 39' 59" E; Record Level: collectionID: MBK080634; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; locality: Mandalay Division ; verbatimLatitude: 22° 00' 29'' N; verbatimLongitude: 96° 28' 06'' E; Event: eventDate: Jan. 11, 2002 ; Record Level: collectionID: Tanaka et al. 021712; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; locality: Mandalay Division ; verbatimLatitude: 20° 48' N; verbatimLongitude: 95° 15' E; Event: eventDate: Mar. 4, 2003 ; Record Level: collectionID: Tanaka et al. 028704; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; locality: Bago Division ; verbatimLatitude: 18° 42' 22'' N; verbatimLongitude: 95° 5' 59'' E; Event: eventDate: Dec. 9, 2006 ; Record Level: collectionID: Sugawara et al. 036433; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; locality: Kachin State ; verbatimLatitude: 26° 6' 34'' N; verbatimLongitude: 96° 42' 58'' E; Event: eventDate: Sep. 19, 2005 ; Record Level: collectionID: Tanaka et al. 040483; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; locality: Shan State ; verbatimLatitude: 20° 35' 41'' N; verbatimLongitude: 96° 31' 46'' E; Event: eventDate: Nov. 26, 2008 ; Record Level: collectionID: Tanaka et al. 080050; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; locality: Shan State ; verbatimLatitude: 20° 35' 41'' N; verbatimLongitude: 96° 31' 46'' E; Event: eventDate: Nov. 26, 2008 ; Record Level: collectionID: Tanaka et al. 080057; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; locality: Shan State ; verbatimLatitude: 20° 27' 28'' N; verbatimLongitude: 96° 50' 37'' E; Event: eventDate: Dec. 4, 2008 ; Record Level: collectionID: Tanaka et al. 080663; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Myanmar ; locality: Taunngyi ; verbatimLatitude: 20° 47' 14" N; verbatimLongitude: 97° 2' 7" E; Event: eventDate: Jan. 5, 1938 ; Record Level: collectionID: F.G. Dickason 9334; institutionCode: GH
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Thailand ; locality: Chiang Mai Province; Chiang Dao District ; verbatimLatitude: 19° 28' 46" N; verbatimLongitude: 98° 54' 44" E; Event: eventDate: Dec. 11, 1992 ; Record Level: collectionID: V.A. Sunthorn, P. Palee 101; institutionCode: GH
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Thailand ; verbatimLatitude: 13° 45' 10" N; verbatimLongitude: 100° 29' 45" E; Record Level: collectionID: T- 50413 [TI]; institutionCode: TI
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Thailand ; locality: Pha Team National Park, Ubon Ratchathani, Thailand ; verbatimLatitude: 15° 24' 07'' N; verbatimLongitude: 105° 29' 20'' E; Record Level: collectionID: Tr. Tanaka; institutionCode: TNS
Type status: Other material. Occurrence: recordedBy: Y. Ito ; Location: country: Thailand ; locality: Hotel river Kwai, Kantchanabury ; verbatimLatitude: 14° 1' 59" N; verbatimLongitude: 99° 31' 10" E; Event: eventDate: Nov. 15, 2012 ; Record Level: collectionID: Y. Ito 1724; institutionCode: BKF
Distribution
Bangladesh, Bhutan, China (nationwide), Indonesia (nationwide), Japan, Malaysia (nationwide), Myanmar, Nepal, Pakistan, Papua New Guinea, Thailand, Sri Lanka.
License | Public Domain |
Rights holder/Author | No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation. |
Source | http://treatment.plazi.org/id/F755E6E150180800A452C4962B6D8D93 |
Rhizomes and erect stems with turions; subterranean turions cream-brown, appearing as tubers, surface smooth; turions from erect stems olive-green, covered with short, stiff scales. Leaves 8--15(--20) ´ 1.2--4 mm, margins serrulate. Inflorescences: spathe of 2 connate bracts. Flowers 1 per spathe; staminate pedicels 0.5 mm; pistillate flowers with floral tube 10--50 mm; ovary 1-locular. 2n = 32.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
Source | http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=200024721 |