Publication: Illustrations of the Botany ... of the Himalayan Mountains ... 1: 376. 1839.
Origin: Introduced from Eurasia
selected vouchers: WTU
Notes: JPM gives authority as (L.f.) Casp., here we follow FNA and use (L. f.) Royle
FNA22: "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."