BC Conservation Data Centre: Species Summary
Polygonum sawatchense ssp. oblivium
Sawatch knotweed
| Scientific Name: | Polygonum sawatchense ssp. oblivium Costea & Tardif | ||||||||||
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| Scientific Name Synonyms: |
Polygonum douglasii ssp. johnstonii
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| English Name: | Sawatch knotweed | ||||||||||
| Classification / Taxonomy | |||||||||||
| Scientific Name - Concept Reference: | Costea, M. and F.J. Tardif. 2003. Typicfication, taxonomy, and a new subspecies of Polygonum sawatchense (Polygonaceae) from North America. SIDA 20(4):1631-1640. | ||||||||||
| Classification Level: | Subspecies | ||||||||||
| Taxonomy Comments: | Polygonum sawatchense is listed as a synonym of P. douglasii ssp. johnstonii in IFBC, but in 2006 the BC CDC decided to follow the treatment in FNA, which recognizes P. sawatchense ssp. sawatchense and P. sawatchense ssp. oblivium. | ||||||||||
| Species Group: | Vascular Plant | ||||||||||
| Species Code: | POLYSAW1 | ||||||||||
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| Conservation Status / Legal Designation | |||||||||||
| Global Status: | GNRTNR | ||||||||||
| Provincial Status: | S2S3 (Apr 2019) | ||||||||||
| BC List: | Blue | ||||||||||
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| Habitats: (Type / Subtype / Dependence) |
Forest / Conifer Forest - Dry / Facultative - frequent use
Forest / Conifer Forest - Mesic (average) / Facultative - occasional use Grassland/Shrub / Meadow / Obligate |
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| Provincial Phenology: (1st half of month/ 2nd half of month) |
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| Elevation (m) (min / max): | Provincial: | ||||||||||
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| Endemic: | N | ||||||||||
| Disjunct, more common elsewhere: | |||||||||||
| Peripheral, major distribution elsewhere: | |||||||||||
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| References and Related Literature | |||||||||||
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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Douglas, G.W., D. Meidinger, and J. Pojar, eds. 1999. Illustrated Flora of British Columbia, Vol. 4, Dicotyledons (Orobanchaceae through Rubiaceae). B.C. Minist. Environ., Lands and Parks, and B.C. Minist. For., Victoria. 427pp. |
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Flora of North America Editorial Committee (FNA). 2005. Flora of North America north of Mexico. Vol. 5. Magnoliophyta: Caryophyllidae: Caryophyllales, Polygonales, and Plumbaginales. Oxford Univ. Press, New York. vii + 656 pp. |
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Please visit the website Conservation Status Ranks for definitions of the data fields used in this summary report.
Suggested Citation:
B.C. Conservation Data Centre. Species Summary: Polygonum sawatchense ssp. oblivium. B.C. Minist. of Environment. Available: https://a100.gov.bc.ca/pub/eswp/ (accessed Jun 6, 2026).