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|Jepson eFlora: Taxon page
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|Family: Hydrocharitaceae||View Description||Dichotomous Key|
|Genus: Hydrilla||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Hydrilla verticillata (L. f.) Royle
Habit: Perennial herb, rooting at nodes, submersed; dioecious. Stem: tuber-like; erect stems elongate, much-branched. Leaf: generally 4--8 per node, sessile, 1--2 cm, 1.5--2 mm wide, oblong, coarsely serrate, midrib prickled abaxially or not, tip generally sharp-pointed. Staminate Inflorescence: flower 1, bract at base of elongate perianth tube, spheric. Pistillate Inflorescence: flower 1, bract at base of elongate perianth tube, +- cylindric. Staminate Flower: deciduous, free-floating; perianth parts 6 in 2 whorls, 3--5 mm; stamens 3. Pistillate Flower: persistent, floating; perianth parts 6 in 2 whorls, 3--5 mm; stigmas 3. Fruit: 5--6 mm, +- fusiform. Chromosomes: 2n=32.
Ecology: Canals, ponds, lakes; Elevation: < 200 m. Bioregional Distribution: NCoRI, n&c SNF, ScV, SCo, D; Distribution Outside California: southeastern and eastern United States, Central America; native to Eurasia, Australia. Flowering Time: Jun--Aug
eFlora Treatment Author: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes
Jepson Online Interchange
Previous taxon: Hydrilla
Next taxon: Limnobium
Citation for this treatment: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes 2017. Hydrilla verticillata, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=28595, accessed on January 21, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on January 21, 2017.