. The Canadian field-naturalist. Natural history; Sciences naturelles. Conservation Evaluation of Slender Collomia, (\)ll(>mia tcnclla. in Canada* George W. Douglas' and Jenifer L. Penny^ ' Deceased. - Conservation Data Centre, British Columbia Ministry of Environment, Ecosystems Branch. PO Box 9993 Stn Prov Govt, Victoria. British Columbia VXW 9R7 Douglas, George W., and Jeniter L. Penny. 2006. Conservation evaluation of Slender Collomia. Collomia tenella, in Canada. Canadian Field-Naturalist 120(2): 175-178. In Canada, Slender Collomia, Collomia tenella, is restricted to the Princeton are
. The Canadian field-naturalist. Natural history; Sciences naturelles. Conservation Evaluation of Slender Collomia, (\)ll(>mia tcnclla. in Canada* George W. Douglas' and Jenifer L. Penny^ ' Deceased. - Conservation Data Centre, British Columbia Ministry of Environment, Ecosystems Branch. PO Box 9993 Stn Prov Govt, Victoria. British Columbia VXW 9R7 Douglas, George W., and Jeniter L. Penny. 2006. Conservation evaluation of Slender Collomia. Collomia tenella, in Canada. Canadian Field-Naturalist 120(2): 175-178. In Canada, Slender Collomia, Collomia tenella, is restricted to the Princeton area in southwestern British Columbia. The single population represents the northern limits of the species, which ranges from southwestern British Columbia, south in the westcm United States to Wyoming, Utiih, Nevada and Oregon. In British Columbia, C. tenella is with an crfxlcd section of a steeply sloping, southeast-facing sandy ridge. Population numbers fluctuate and in some years plants fail to appear. The major threats to C. tenella are through drilling for coalbed methane , sand removal for road construction, housing dc\el()pmcni and off-road recreational vehicles. Key Words: Slender Collomia, Collomia tenella, endangered, distribution, population size. British Columbia. Slender Collomia. Collomia tenella A. Gray' (Pole- moniaceae), is member of a genus of about 13 species found in North and South America (Hitchcock et al. 1959). Four species occur in British Columbia and Canada (Scoggan 1979; Pojar 1999). Collomia tenella was first recorded in Canada by Douglas et al. (1998a). Collomia tenella is an ascending to spreading, freely branched, annual, tap-rooted herb up to 15 cm tall (Figure 1; Pojar 1999). The leaves are alternate, lin- ear, entire, 1-5 cm long and mm wide. Flowers are single or in pairs at the branch tips, in the leaf axils or at the forks of the branches. The pinkish to white corollas are five-lobed. The calyces, which bow out and often f
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