. The Canadian field-naturalist. Natural history. 454 The Canadian Field-Naturalist Vol. 115. Figure 3. A dense population of Balsamorhiza deltoidea on the Campbell River Indian Reserve. (Photo by Sylvia M. Douglas). plants. Park enhancement projects, road and trail developments and heavy recreational use by humans often result in the destruction of the native vegeta- tion and rare plant species. The largest population (1600 plants), located on an Indian Reserve at Campbell River, is also the most seriously threatened population. The loss of Balsamorhiza deltoidea at this site seriously jeopar
. The Canadian field-naturalist. Natural history. 454 The Canadian Field-Naturalist Vol. 115. Figure 3. A dense population of Balsamorhiza deltoidea on the Campbell River Indian Reserve. (Photo by Sylvia M. Douglas). plants. Park enhancement projects, road and trail developments and heavy recreational use by humans often result in the destruction of the native vegeta- tion and rare plant species. The largest population (1600 plants), located on an Indian Reserve at Campbell River, is also the most seriously threatened population. The loss of Balsamorhiza deltoidea at this site seriously jeopardizes the future of this species in Canada considering that the number of individuals comprising the remaining populations number less than 250 plants in total. Evaluation of Status Balsamorhiza deltoidea is considered, by the British Columbia Conservation Data Centre (Douglas et al. 1998a) to be endangered in Canada and is known only from six extant colonies restricted to southeastern Vancouver Island. Except for the large population (1600 plants) at Campbell River, the remaining populations range from five to 72 individu- als and may be in danger of extirpitation. The progno- sis for this species is not good considering the threats posed by potential developments and by aggressive competitive species such as Cytisus scoparius which dominate many suitable habitats and directly threaten some colonies. Therefore, even if all colonies were protected from human interference, many colonies may eventually disappear as a result of aggressive introduced species. Likewise, much of the Quercus garryana vegetation in which Balsamorhiza deltoidea is usually found has been extensively altered or destroyed, thus Umiting the potential of this species to become established at new sites. Acknowledgments We thank Carmen Cadrin for information acquired at one of the sites and Betty Brooks, Marta Donovan, Sylvia Douglas, Tracy Fleming, Marie Fontaine, Sharon Hartwell and Jenifer Penny for aid- in
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