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Hydrilla verticillata (L. f.) Royle
Hydrilla; Oxygen weed; Water thyme; Water weed; Hydilla; Serpicula verticillata Lf; Elodea verticillata Lf FMuell; Hydrilla dentata Casp; Udora australis FMuell sensu Mueller, FJH von 1854; Elodea nuttallii auct, non (Planch) H St John; Hydrilla lithuanica Dandy pro parte; Serpicula verticillata L f; Waterthyme; Water-Thyme

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Hydrilla verticillata
© Les Mehrhoff, 2008-2010 · 2
Hydrilla verticillata
Hydrilla verticillata
© Les Mehrhoff, 2008-2010 · 2
Hydrilla verticillata
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Kingdom Plantae  
 Phylum Magnoliophyta  
 Class Liliopsida  
 Order Alismatales  
 Family Hydrocharitaceae  
 Genus Hydrilla  
  Hydrilla verticillata    (L. f.) Royle, 1839 
Provider: Ching-I Peng 
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Synonyms: Elodea verticillata Epigynanthus blumei Hydora lithuanica Hydrilla angustifolia Hydrilla dentata Hydrilla dentata pomeranica Hydrilla lithuanica Hydrilla najadifolia Hydrilla ovalifolia Hydrilla polysperma Hydrilla roxburghii details
Citation: Flora of Taiwan 2nd ed. 5: 15, 2000
Name Code: 201734
  IUCN Red List:LC      
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FNA | Family List | FNA Vol. 22 | Hydrocharitaceae | Hydrilla

1. Hydrilla verticillata (Linnaeus f.) Royle, Illustrations of the Botany ... of the Himalayan Mountains ... 1: 376. 1839.

Serpicula verticillata Linnaeus f., Suppl. Pl., 416. 1782

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.

Flowering summer--fall. Lakes, streams, rivers, bayous; introduced; 0--200 m; introduced; Ala., Calif., Conn., Del., D.C., Fla., Ga., La., Md., Md., Miss., S.C., Tenn., Tex., Va.; Mexico; West Indies; Central America; South America (Venezuela); Eurasia; Africa; Australia.

Hydrilla verticillata apparently entered the United States in 1959 at Miami, Florida (D. F.F. Austin 1978). It was introduced as an aquarium plant, star-vine or oxygen plant (D. P. Tarver et al. 1978). By 1960 the species was reported as naturalized in Florida (G. E. Allen 1976).

Hydrilla verticillata is widely distributed in the Eastern Hemisphere but it is uncertain as to where it is truly native. It grows in a variety of aquatic habitats ranging from acidic to basic, oligotrophic to eutrophic, fresh to brackish, and from a few centimeters to a meter or more if light penetrates that deeply. Growth and spread often are rapid. Stem fragments become rooted by fine, unbranched adventitious roots and soon produce vegetative reproductive structures from both subterranean and erect stems. Tubers produced on subterranean stems are pale brown; those produced on erect stems are dark olive-green and covered with short, stiff scales. Both types germinate quickly to produce new stems.

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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Hydrilla+verticillata&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Hydrilla+verticillata&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant
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Updated: 2018-04-22 09:20:06 gmt
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