Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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HYDROCHARITACEAE

WATERWEED FAMILY

Robert F. Thorne

Annual, perennial herb, aquatic, freshwater or marine, bisexual, monoecious, or dioecious
Leaves basal or cauline, alternate, opposite, or whorled, generally ± sheathing at base, glabrous
Inflorescence: cyme; flowers 1–few, subtended by ± sheathing, entire or lobed bract; staminate flowers sometimes deciduous, free-floating
Flower radial; perianth tube 0 or much elongated, peduncle-like in flower; sepals (0)3, green; petals (0)3, colored or white; stamens (1)3–many, generally in 1+ series; ovary inferior, chamber 1, placentas parietal or basal, ovules 1–many; style lobes generally 3, linear, lobed or notched
Fruit: achene or berry-like and dehiscing irregularly, linear to spheric, submersed
Genera in family: ± 17 genera, ± 130 species: worldwide; some cultivated for aquaria, others noxious weeds.

EGERIA

BRAZILIAN WATERWEED

Perennial, rooted in mud, submersed or floating, dioecious (CA plants staminate)
Stem slender, sometimes branched or not
Leaves opposite below, crowded and whorled above, 3–6 per whorl, sessile
Staminate inflorescence: flowers 2–3, clustered, peduncled; bract slender
Pistillate inflorescence: flower 1, axillary; bract slender, ± tubular
Staminate flower floating; perianth tube elongated, slender, peduncle-like, persistent on plant; stamens 9
Pistillate flower floating; perianth tube elongated, slender, peduncle-like, persistent on plant; stigmas 3, 3–4-lobed
Species in genus: 2 species: South America
Etymology: (Latin: a mythical water nymph)

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