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Lemnoideae; close-up of two different duckweed types: spirodela polyrrhiza and wolffia globosa: the latter are less than 2 mm long. scientific classification; kingdom: plantae. Archives and past articles from the philadelphia inquirer, philadelphia daily news, and philly.com.. Raising fish at your home based farm could be a profitable business. you will need some basic fish farming knowledge and business knowledge to run a successful.