In British Columbia, scarlet ammannia (Ammannia robusta Rottb.) is restricted to two sites in the south-central part of the province in the Osoyoos Lake area. Two other sites discovered in 1953 are considered extirpated. The two extant sites represent the northern limit of this species, which extends from British Columbia down through much of the central and western U.S.A. to Mexico and Central America. Population trends and phenological patterns appear to totally depend on seasonal water levels. The continued survival of this species at both sites in B.C. depends on water levels controlled by dams. Given that there is a limited number of populations, and that their persistence is precarious, it is recommended that A. robusta be considered Endangered in British Columbia.
Douglas, George W.. 1999. Status of Scarlet Ammania in British Columbia. Ministry of Environment, Lands and Parks. Species Status Report. B93
Topic: Species status
Keywords: scarlet ammannia, ammannia robusta rottb., species, status
Scientific Name: Ammannia robusta
English Name: Scarlet Ammannia
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