This site provides information on aquatic alien plants in Northrhine-Westphalia (including images). Only available in German language. [Editorial staff vifabio]
The family of duckweeds (botanically, the Lemnaceae) are the smallest flowering plants. These plants grow floating in still or slow-moving fresh water around the globe, except in the coldest regions. The growth of these high-protein plants can be extremely rapid. Lemna is one of the best known of this group and has been the subject of much research. Researchers are using these plants to study basic plant development, plant biochemistry, photosynthesis, the toxicity of hazardous substances, and much more. Genetic engineers are cloning duckweed genes and modifying duckweeds to inexpensively produce pharmaceuticals. Environmental scientists are using duckweeds to remove unwanted substances from water. Aquaculturists find them an inexpensive feed source for fish farming. To learn more about these fascinating plants, next read the botanical facts, or view some duckweed illustrations. Read about cloning. ... [Information of the supplier]
The primary purpose of this guide is to assist U.S. Army Corps of Engineers (Corps) personnel working with the regulatory program under Section 404 of the Clean Water Act and Section 10 of the Rivers and Harbors Act of 1899. It provides an easy-to-use, pictorial guide to wetlands primarily for individuals who are not botanists, although botanists may also find it useful. A secondary purpose is to provide a guide for individuals working with other agencies and programs dealing with wetlands. Finally, this guide serves to enhance public awareness of wetlands by illustrating their diversity and values. The guide specifically addresses wetland plants and plant communities of Minnesota and Wisconsin, but is applicable in general to wetlands of the entire Great Lakes Region. Note that the 144 plant species included in the guide do not represent, nor are they intended to represent, a listing of all plant species found in wetlands of Minnesota and Wisconsin. For a complete listing of these species, refer to the botanical references listed in the bibliography. ... [Information of the supplier]