BC Conservation Data Centre: Conservation Status Report
Sagina decumbens ssp. occidentalis
western pearlwort
| Scientific Name: | Sagina decumbens ssp. occidentalis |
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| English Name: | western pearlwort |
| Provincial Status Summary | |
| Status: | S5 |
| Date Status Assigned: | April 30, 2019 |
| Date Last Reviewed: | April 30, 2019 |
| Reasons: | This species occurs in at least 22 locations and ranges over about 11,000 square km on southern Vancouver Island, where it is mostly not threatened. |
| Range | |
| Range Extent: | F = 20,000-200,000 square km |
| Range Extent Comments: | Using GIS tools, this species range in BC is about 11,000 square km on S Vancouver Island. |
| Area of Occupancy (km2): | U = Unknown |
| Occurrences & Population | |
| Number of Occurrences: | C = 21 - 80 |
| Comments: | There are at least 22 occurrences in BC. |
| Number of Occurrences with Good Viability / Ecological Integrity: | U = Unknown |
| Number of Occurrences Appropriately Protected & Managed: | C = 4 - 12 |
| Comments: | Two populations effectively protected in Ecological Reserves (Trial Island, Race Rocks); several more are in Provincial Parks, where their level of protection will depend upon effective communication between management and field staff. |
| Population Size: | D = 1,000 - 2,500 individuals |
| Comments: | There are at least 1000 plants documented in BC, but potentially many more exist in appropriate habitats on S Vancouver Island. |
| Threats (to population, occurrences, or area affected) | |
| Degree of Threat: | Unthreatened |
| Comments: | Only very non-imminent stochastic threats such oil spills limit this species, although its occurrences do coincide with a major shipping lane. It is widely scattered so that recreational pressures would probably never make a big impact. |
| Trend (in population, range, area occupied, and/or condition of occurrences) | |
| Short-Term Trend: | U = Unknown |
| Long-Term Trend: | U = Unknown |
| Other Factors | |
| Intrinsic Vulnerability: | U=Unknown |
| Environmental Specificity: | C=Moderate. Generalist or community with some key requirements scarce. |
| Comments: | Mostly associated with shorelines. |
| Other Rank Considerations: | |
| Information Gaps | |
| Research Needs: | |
| Inventory Needs: | |
| Stewardship | |
| Protection: | |
| Management: | |
| Version | |
| Author: | Penny, J.L. |
| Date: | March 29, 2001 |
| References | |
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British Columbia Conservation Data Centre. Botany Program. 2000. Database containing records of rare plant collections and observations in the province of British Columbia.
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Douglas, G.W., D. Meidinger, and J. Penny. 2002. Rare Native Vascular Plants of British Columbia, 2nd ed. B.C. Conserv. Data Centre, Terrestrial Inf. Branch, Victoria. 358pp.
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Please visit the website Conservation Status Ranks for information on how the CDC determines conservation status ranks. For global conservation status reports and ranks, please visit the NatureServe website http://www.natureserve.org/.
Suggested Citation:
B.C. Conservation Data Centre. 2001. Conservation Status Report: Sagina decumbens ssp. occidentalis. B.C. Minist. of Environment. Available: https://a100.gov.bc.ca/pub/eswp/ (accessed Jun 7, 2026).