Ecological Risk Screening Summary - Cuban Bulrush (Cyperus blepharoleptos) - High Risk

Species that are considered high risk have a well-documented history of invasiveness in at least one location globally and are of establishment concern for the contiguous United States based on a climate matching analysis.

Cyperus blepharoleptos, Cuban Bulrush, is a flowering aquatic epiphyte plant that is native to Central and South America. It has been introduced and become established in Africa and the United States. Cyperus blepharoleptos forms dense mats on the surface of bodies of water. Cyperus blepharoleptos is dependent on a preexistent aquatic vegetation to form floating mats or “tussocks.” Historically, this species was likely introduced through ship ballast. It may also be spread by migratory birds ingesting and transporting achenes or seeds. Cyperus blepharoleptos tussocks impede water navigation as well as recreational activities. Cyperus blepharoleptos also outcompetes submersed aquatic plants for light and degrades water quality from increased organic matter and decreasing oxygen levels. The History of Invasiveness for Cyperus blepharoleptos is classified as High due to its history of introductions and establishment and its economic and ecological impact. The climate matching analysis indicates establishment concern for this species.Areas of high match were found in the Southeast and Southwest. The Certainty of Assessment for this ERSS is classified as Medium due tothe contradicting information regarding this species native distribution. The Overall Risk Assessment Category for Cyperus blepharoleptos in the contiguous United States is High.