Conservation Evaluation of the Pacific Population of Dwarf Woollyheads, Psilocarphus brevissimus var. brevissimus, in Canada


  • George W. Douglas Deceased
  • Jenifer L. Penny Conservation Data Centre, British Columbia Ministry of Environment, Ecosystems Branch, PO BOX 9993 Stn Prov Govt, Victoria British Columbia V8W 9R7
  • Ksenia Barton 204-4272 Albert Street, Burnaby, British Columbia V5C 2E8



Dwarf Woolly-heads, Psilocarphus brevissimus var. brevissimus, British Columbia, endangered, distribution, population size


In Canada, Dwarf Woolly-heads, Psilocarphus brevissimus var. brevissimus, is restricted to the Similkameen River valley, south of Princeton in southwestern British Columbia and the extreme southeast and southwest corners of Alberta and Saskatchewan, respectively. This paper deals with the three British Columbia populations which represent the northwestern limit of the species which ranges from south-central British Columbia, southward in the western United States to Montana, Idaho, Washington, Oregon, Nevada, Utah, Wyoming, California and Baja California, Mexico. In British Columbia, P. brevissimus is associated with calcareous vernal pools and ephemeral pond edges in large forest openings. This habitat is rare in the area the few existing populations could easily be extirpated or degraded through slight changes in groundwater levels, coalbed methane gas drilling, housing development or recreational vehicles.