Conservation Evaluation of the Small-flowered Tonella, Tonella tenella, 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



Small-flowered Tonella, Tonella tenella, endangered, distribution, population size, British Columbia


In Canada, the Small-flowered Tonella, Tonella tenella, is restricted to the west side of Saltspring Island in the Gulf Islands of southwestern British Columbia. This population represents the northern limits of the species which is disjunct from its main range in southern Washington (Columbia River gorge), through Oregon to central California. In British Columbia, Tonella tenella is associated with rock outcrops and dry, steep, sparsely forested talus slopes at elevations of 50 to 300 m. The population on Saltspring Island is on private property and not directly imperilled at this time. There is, however, a potential for housing development in the future on this waterfront site, thus the authors consider the species endangered.