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U.S. Forest Service

Threatened, Endangered, and Proposed (TEP) Plant Profile

Howellia aquatilis in flower. Howellia aquatilis. Photo by Rod Gilbert.

Howellia aquatilis habitat. Howellia aquatilis habitat. Photo by Rod Gilbert.

Howellia aquatilis range map. Howellia aquatilis range map.

Howellia aquatilis, water howellia

ESA Status

Visit the U.S. Fish & Wildlife Service Species Profile link below for links to listing and other USFWS documents.


  • Loss of alteration of habitat by timber harvest activities, such as alteration of the hydrologic regime and increased siltation of wetlands
  • Livestock use of howellia wetlands
  • Invasion by non-native plant species, especially reed canary grass
  • Outright conversion of wetland habitat to other uses by draining, diking, and damming
  • Urban development
  • Lack of genetic variation
  • Climate change leading to changes in seasonal wetland inundation patterns

Conservation Status

National Forest and Grassland Occurrence

More Information