PROTECTION STATUS: Endangered
YEAR PLACED ON LIST: 1997
CRITICAL HABITAT: 83.2 kilometers of streams and rivers in Arizona’s Cochise and Santa Cruz counties designated in 1999
RECOVERY PLAN: None
RANGE: The San Pedro River, Santa Cruz River, Rio Yaqui, and Rio Sonora
THREATS: Destruction, modification, or curtailment of habitat resulting from wetland degradation and loss, groundwater pumping and growing water demand, livestock grazing, wood cutting, mining, fire suppression, water diversion, dredging, rural and urban development, and recreation; as well as nonnative plant invasion
POPULATION TREND: The plant has been extirpated from six of 26 sites in its historical range. Individual plant numbers are difficult to determine.