Lyall?s mariposa lily (Calochortus lyallii) is found only in the extreme south-central B.C. where it inhabits semi-arid, mid-elevation grasslands between the Okanagan Valley and Similkameen River. It is known from only 5 populations, containing 18 subpopulations. Lyall?s mariposa lily was designated as Special Concern by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC 2011). This plant was formerly designated as Threatened, but most of the area where it occurs has been designated as a provincial protected area. Of the two subpopulations that were on private land at the time of the last COSEWIC assessment, one is now within the Sage and Sparrow Conservation Area owned by the Nature Conservancy of Canada. It is expected that the current listing of Threatened in Canada on Schedule 1 of the Species at Risk Act (SARA) will be changed to Special Concern to align with the current COSEWIC assessment. In B.C., the Lyall?s mariposa lily is ranked S3 (special concern, vulnerable to extirpation or extinction) by the B.C. Conservation Data Centre and is on the provincial Blue list. The B.C. Conservation Framework ranks Lyall?s mariposa lily as priority 1 under goal 1 (contribute to global efforts for species and ecosystem conservation), priority 6 under goal 2 (prevent species and ecosystems from becoming at risk), and priority 1 under goal 3 (maintain the diversity of native species and ecosystems).
The management goal for this species is to maintain all known populations within British Columbia, as they are currently represented by subpopulation sizes and distribution.
The following are the management objectives for this species:
1. Assess and mitigate livestock impacts at 3 known Lyall?s mariposa lily populations and 2 of the known subpopulations during critical phenological periods.
2. Assess and mitigate the threats of invasive alien species encroachment and forest encroachment (secondary succession) due to fire suppression.
3. Monitor all known Lyall?s mariposa lily populations every 3?5 years.
Ministry of Environment. 2015. Management Plan for Lyall?s Mariposa Lily (Calochortus lyallii) in British Columbia. Province of BC, Ministry of Environmennt. Management Plan (Species at Risk)
Topic: Recovery Planning
Scientific Name: Calochortus lyallii
English Name: Lyall's Mariposa Lily
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