<Tr> <Td_colspan="2"> <P> 9 - 11, see text </P> </Td> </Tr> <P> 9 - 11, see text </P> <P> Wolffia is a genus of nine to 11 species which include the smallest flowering plants on Earth . Commonly called watermeal or duckweed, these aquatic plants resemble specks of cornmeal floating on the water . Wolffia species are free - floating thalli, green or yellow - green, and without roots . The flower is produced in a depression on the top surface of the plant body . It has one stamen and one pistil . Individuals often float together in pairs or form floating mats with related plants, such as Lemna and Spirodela species . Most species have a very wide distribution across several continents . Wolffia species are composed of about 40% protein on a dry - matter basis, about the same as the soybean, making them a potential high - protein human food source . They have historically been collected from the water and eaten as a vegetable in much of Asia . The genus was first recorded in New Zealand by Ruth Mason . </P> <Table> <Tr> <Td> <Ul> <Li> Wolffia angusta </Li> <Li> Wolffia arrhiza </Li> <Li> Wolffia australiana </Li> <Li> Wolffia borealis </Li> <Li> Wolffia brasiliensis </Li> <Li> Wolffia columbiana </Li> <Li> Wolffia cylindracea </Li> <Li> Wolffia elongata </Li> <Li> Wolffia globosa </Li> <Li> Wolffia microscopica </Li> <Li> Wolffia neglecta </Li> </Ul> </Td> <Td> An 1885 illustration of Wolffia arrhiza </Td> </Tr> </Table>

The smallest flowering plant on the earth is
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