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Published In: Beiträge zur Botanik 1: 233. 1844. (11-13 Jul 1844) (Beitr. Bot.) Name publication detail

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


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3. Wolffia Horkel (watermeal)

Plants minute, of 1 or 2 unequal, connected fronds, sometimes producing turions. Roots absent. Fronds 0.4–1.0 mm long, globose or ovoid, flat or concave above in some species, green or with red or brown spots. Veins absent. Pouches 2 per frond, the one along the margin of the frond producing vegetative buds, the one on the upper surface producing flowers. Fruits 0.3–0.6 mm long, lacking wings, the seed lacking ribs. Eight species, worldwide.

Wolffia contains the smallest flowering plants known. Magnifications of 10¥ or higher are necessary to separate the species.


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1 Fronds rounded above, lacking red or brown spots and papules 3 Wolffia columbiana
+ Fronds flattened to concave above, usually punctate with small red or brown spots (2)
2 (1) Fronds rounded at tip, with a large central papule 2 Wolffia brasiliensis
+ Fronds pointed at tip, lacking a central papule 1 Wolffia borealis
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