NPSpecies

Data Source: NatureServe. 2007. Vascular Plant Inventory of Obed Wild and Scenic River. Draft Report Submitted to NPS, Appalachian Highlands I&M Network.

Data Source: NatureServe. 2007. Vascular Plant Inventory of Obed Wild and Scenic River. Draft Report Submitted to NPS, Appalachian Highlands I&M Network. Legacy NPSpecies information may no longer be applicable, please remove if it is not applicable. In legacy NPSpecies Cultivation value was Not cultivated with comment: Data Source: NatureServe. 2007. Vascular Plant Inventory of Obed Wild and Scenic River. Draft Report Submitted to NPS, Appalachian Highlands I&M Network. In legacy NPSpecies Weedy value was Yes In legacy NPSpecies Pest value was Yes with comment: TN EPPC RANK = SIGNIFICANT THREAT; NatureServe I Rank = High. This species has been called "the perfect aquatic weed" (Langeland 1997). Hydrilla verticillata alters ecosystem processes, community structure, and community composition by forming dense mats of floating vegetation that impede water flow and suppress all other aquatic vegetation (Batcher et al 2003; Langeland 1997; Jacono and Richerson 2003). It has a direct negative impact on several native plant species: Potamogeton spp., Vallismeria americana, and Ceratophyllum demersum (Ramey 2001). Numerous recent reports of new infestations in Pennsylvania, Massachusettes, Maine, New Jersery, Louisana, California, Washington, and Arkansas (Jacono and Richerson 2003). Reproduces by propagules, known as "turions," and from plant fragments (Langeland 1997). Disperses by water currents, waterfowl, and human activity (Batcher et al 2003; Langeland 1997). Management is very difficult, requiring more than ten years (Balciunas et al. 2002; Batcher et al 2003; Langeland 1997) (NatureServe 2007).

Data Source: NatureServe. 2007. Vascular Plant Inventory of Obed Wild and Scenic River. Draft Report Submitted to NPS, Appalachian Highlands I&M Network.