related to Eurasian watermilfoil. It gets its name from bright green, feather-like leaves which are whorled around its stem, forming thick mats that choke waterbodies, impede recreation, and threaten to change the physical and chemical characteristics of Pennsylvania’s lakes and streams. Species Description Parrotfeather has both submersed and emergent leaves that can extend up to 30 cm above the water surface. Submerged leaves are more feathery and reddish, while emergent leaves are bright green. Leaves are often arranged in whorls of four to six around each node of the stem. The emergent green stem, which often looks like a fir tree, is its most identifying characteristic. When emergent stems and leaves are not present, parrotfeather may be confused with bladderworts, hornworts, and other leafy milfoils. Native & Introduced Ranges While its native range extends throughout most of South America, parrotfeather was brought to the United States by the aquarium industry as a popular indoor and outdoor garden plant; possibly as early as the 1800s. After it escaped cultivation, most likely by release from an aquarium owner, it spread throughout the United States. In Pennsylvania, parrotfeather has been found in south central regions such as Bedford and Adams counties, and in eastern Pennsylvania in Lackawanna, Lehigh, Bucks, Philadelphia, and Delaware counties
To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.