Western spiderwort (Tradescantia occidentalis) recovery strategy 2013: chapter 1
1. COSEWIC* Species Assessement Information
Date of Assessment: November 2002
Common Name (population): Western Spiderwort
Scientific Name: Tradescantia occidentalis
COSEWIC Status: Threatened
Reason for Designation: A perennial restricted to four disjunct sand dune habitats where the species is at risk from invading leafy spurge, cattle grazing, and dune stabilization.
Canadian Occurrence: Alberta, Saskatchewan and Manitoba
COSEWIC Status History: Designated Threatened in April 1992. Status re-examined and confirmed in November 2002.
* COSEWIC: Committee on the Status of Endangered Wildlife in Canada