Annales des Sciences Naturelles, Botanique sér. 3, 11: 79. 1849.

Common names: South American elodea
Etymology: Latin egeri, a nymph, in reference to aquatic habitat
Treatment appears in FNA Volume 22.

Plants perennial, of fresh waters. Rhizomes and stolons absent. Erect stems rooted in substrate, branched or unbranched, elongate. Leaves cauline, in whorls of 5 or more [opposite], submersed, sessile; blade linear, base sloping to stem, apex obtuse; midvein without rows of lacunae along side(s), blade uniform in color throughout;; abaxially surface without prickles or aerenchyma; intravaginal squamules entire. Inflorescences 1-flowered, sessile; spathes not winged. Flowers unisexual, staminate and pistillate on different plants, projected to surface by slender, elongate floral tube base, pedicellate; petals white. Staminate flowers: filaments distinct; anthers linear; pollen in monads. Pistillate flowers: ovary 1-locular; styles 3, not 2-fid. Fruits ovoid, smooth, dehiscing irregularly. Seeds fusiform, mucilaginous.


Introduced; North America, Central America, South America, Eurasia, Africa, Australia.


Species 2 (1 in the flora).

Lower Taxa

... more about "Egeria"
Robert R. Haynes +
Planchon +
South American elodea +
North America +, Central America +, South America +, Eurasia +, Africa +  and Australia. +
Latin egeri, a nymph, in reference to aquatic habitat +
Annales des Sciences Naturelles, Botanique +
cook1984c +  and john1961a +
Hydrocharitaceae +