Jepson eFlora: Key page
Vascular Plants of California
Key to families | Table of families and genera

Key to Hydrocharitaceae

View taxon page for Hydrocharitaceae


Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Plants floating (rooted in mud when stranded); leaves (when floating) with swollen spongy cells abaxially ..... LIMNOBIUM

1' Plants submersed to emergent; leaves without swollen spongy cells abaxially

2. Leaves , petioled, , lower, submersed blades  to , upper, floating or emergent blades ovate to  or  – flower , emergent ..... [OTTELIA]

2' Leaves cauline to   or 

3. Perianth 0; leaves ± opposite to ± whorled; seeds smooth or pitted ..... NAJAS

3' Perianth present; leaves opposite or generally whorled; seeds smooth

4. Leaves 1.2–4 cm, 2–5 mm wide; staminate flowers 2–3, petals 8–10 mm ..... EGERIA

4' Leaves < 1.5(2) cm, < 3 mm wide; staminate flowers 1, petals generally <= 5 mm

5. Leaves often 2 per  proximally, 3–7 distally, minutely , midrib abaxially ± smooth ..... ELODEA

5' Leaves generally 4–8 per node, coarsely serrate, midrib abaxially prickled or not ..... HYDRILLA



Citation for the whole project: Jepson Flora Project (eds.) . Jepson eFlora, [accessed on ]

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

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