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Wolffia

Genus of aquatic plants

Wolffia
Summary

Genus of aquatic plants

mm}} long.

Wolffia is a genus of aquatic plants with a cosmopolitan distribution. They include the smallest flowering plants on Earth. Commonly called watermeal or rootless duckweed, these aquatic plants resemble specks of cornmeal floating on the water. They often float together in pairs or form floating mats with related plants, such as Lemna and Spirodela species.

Description

Wolffia are free-floating aquatic plants with fronds that are nearly spherical to cylindrical in shape and lack airspaces or veins. They do not have roots. Their rarely seen flowers originate from a cavity on the upper surface of the frond, and each flower has one stamen and one pistil.

Although Wolffia can reproduce by seed, they usually use vegetative reproduction. A mother frond has a terminal conical cavity from which it produces daughter fronds.

Physiology

The growth rate of Wolffia varies within and among species. The rates of photosynthesis and respiration also vary proportionately to growth rate. The fastest growth rate (in fact, the fastest growth rate of any flowering plant) is shown by a clone of Wolffia microscopica, with a doubling time of 29.3 hours.

As food

Wolffia are a potential high-protein livestock food source. One species, W. microscopica, is over 20% protein by dry weight and has high content of essential amino acids. They have historically been collected from the water and eaten as a vegetable in Asia.

Species

An 1885 illustration of ''Wolffia arrhiza''

, eleven species are accepted on Kew's Plants of the World Online:

  • Wolffia angusta Landolt
  • Wolffia arrhiza (L.) Horkel ex Wimm.
  • Wolffia australiana (Benth.) Hartog & Plas
  • Wolffia borealis (Engelm.) Landolt
  • Wolffia brasiliensis Wedd.
  • Wolffia columbiana H.Karst.
  • Wolffia cylindracea Hegelm.
  • Wolffia elongata Landolt
  • Wolffia globosa (Roxb.) Hartog & Plas
  • Wolffia microscopica (Griff.) Kurz
  • Wolffia neglecta Landolt

References

References

  1. "Wolffia Horkel ex Schleid {{!}} Plants of the World Online {{!}} Kew Science".
  2. (2009-11-25). "The Charms of Duckweed".
  3. "UC/JEPS: Jepson Manual treatment for WOLFFIA".
  4. "USDA Plants Database".
  5. (2015-09-11). "How fast can angiosperms grow? Species and clonal diversity of growth rates in the genus Wolffia (Lemnaceae)". Acta Physiologiae Plantarum.
  6. (2017-02-15). "Nutritional value of duckweeds (Lemnaceae) as human food". Food Chemistry.
Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

lemnoideae araceae-genera freshwater-plants
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