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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.


Perennial herb, rooting at nodes, submersed; dioecious or some flowers bisexual. Stem: slender, generally branched. Leaf: often 2 per node proximally, 3–7 distally, sessile, minutely serrate, midrib abaxially ± smooth. Inflorescence: axillary, sessile or not; flower 1; bract generally notched. Staminate flower: floating, deciduous or not; perianth tube elongate, slender, peduncle-like; stamens 3–9. Pistillate flower: floating; perianth tube elongate, slender, peduncle-like; style slender, stigmas 3, lobes 0 or 2. Fruit: cylindric to ovoid. Seed: several, smooth.
± 12 species: temperate, tropical America. (Greek: of marshes)
Unabridged references: [St. John, 1965 Rhodora 67:1–35, 155–180]

Key to Elodea

1. Mid-stem leaves 2–3 per node, tip rounded or obtuse; staminate inflorescence bract 10–42 mm ..... E. bifoliata

1' Mid-stem leaves 3(4) per node, tip obtuse, abruptly pointed, or acute; staminate inflorescence bract 2.2–13.5 mm

2. Leaves 2–5 mm wide, tip obtuse to abruptly pointed; staminate flowers deciduous in late bud or when flowers open, petals ± 5 mm; pistillate sepals ± 2–3 mm ..... E. canadensis

2' Leaves 0.3–2 mm wide, tip acute; staminate flowers deciduous in bud, petals generally 0 or ± 0.5 mm; pistillate sepals ± 1 mm ..... E. nuttallii


Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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