Hydrilla

Rich.
Description: 
Submerged, freshwater annual or perennial herbs, gynodioecious; roots unbranched; stems horizontal and stoloniferous below, erect and spreading above; bulbil-like turions (hibernacula) developing underground terminally on stolons, or axillary on erect stems or their branches. Leaves opposite and scale-like towards base of stem or branch, otherwise linear to ovate and in whorls of 3
Distribution: 
Monotypic: Hydrilla verticillata (L.f.) Royle, Old World, naturalised in America and a serious pest in U.S.A.; sthn trop Afr.: Zambia, Mozambique, probably introduced.
Source: 
SSTA
Classification: 
HYDROCHARITACEAE

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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith