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Published In: Linnaea 13(4): 391–392. 1839. (Linnaea) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 7/9/2009)
Acceptance : Accepted
Project Data     (Last Modified On 7/22/2009)


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2. Spirodela Schleid. (big duckweed)

Plants of 1–3, unequal connected fronds, sometimes producing turions. Roots 2–20 per frond, attached at a node near the frond base. Fronds flat or slightly convex above and beneath, ovate to obovate or suborbicular, green, sometimes reddish beneath or with reddish margins, spots, or areas. Veins 5–16. Pouches 2, along the margin near node. Fruits with narrow lateral wings. Three species, worldwide.


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1 Roots 6–18 per frond; fronds 4–8 mm long, broadly obovate to suborbicular; veins 5–11(–17) 1 Spirodela polyrhiza
+ Roots 2–5 per frond; fronds 2–5 mm long, oblong to obovate; veins 2–5(–7) 2 Spirodela punctata
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