Lyall's Mariposa Lily
Scientific Name: Calochortus lyallii
Taxonomy Group: Vascular Plants
Range: British Columbia
Last COSEWIC Assessment: May 2011
Last COSEWIC Designation: Special Concern
SARA Status: Schedule 1, Special Concern
Image of Lyall's Mariposa Lily
The Lyall's Mariposa Lily is a long-lived perennial herb with a single, long, flat, basal leaf and a hairless stem measuring 10 to 30 cm, which grows each year from a subterranean bulb. Its purplish, bell-shaped flowers are composed of three fringed, lance-shaped petals and three sepals.
Distribution and Population
The species occurs along the eastern slope of the Cascade Mountains from extreme south central British Columbia to Yakima County in Washington state. The entire Canadian population occurs south of Richter Pass, between the Similkameen river and the Okanagan Valley, and is limited to a single height of land adjacent to the United States border. There are eleven known colonies, all so close together that they constitute only 3 or 4 effective populations. Most of these occur on provincial Crown Land on the upper slopes of Black Mountain.
Lyall’s Mariposa Lilies inhabit open grass-forb meadows within Douglas-fir forests at an elevation of 900 to 1300 m. Sites are dry and water-shedding, with low shrub cover. Summers are warm and dry and winters are cool, as a result of the rain shadow effect cast by the Coast-Cascade Mountains (coastal mountains intercept the clouds and rain advancing from the west, resulting in dry eastern slopes). This mariposa lily is shade intolerant. Disturbances, such as fires, may play a role in creating the natural forest openings it requires.
The Lyall's Mariposa Lily comes into bloom by June. The flowers are insect pollinated and self-compatible (produce seeds when self pollinated). The species reproduces solely by seed, which are poor dispersers. They are shed close to the parent plant in July and germinate the following spring. Adult plants alternate between reproductive and vegetative states. The foliage and fruit are browsed by insects and the bulbs are eaten by small mammals.
Silvicultural practices (especially the planting of coniferous tree seedlings in logged areas, including in areas that were natural meadow openings), excessive trampling and grazing by livestock, and invasion of habitat by exotic weeds threaten the species. Herbivory by insects and small mammals can also have a detrimental impact on populations. Finally, pollinator availability and poor seed dispersal are intrinsic biological limiting factors.
Federal ProtectionMore information about SARA, including how it protects individual species, is available in the Species at Risk Act: A Guide.
Of the eleven colonies found in British Columbia, two occur on private land, and the other nine are on provincial Crown Land administered by the British Columbia Ministry of Forests.
Provincial and Territorial Protection
Status of Recovery Planning
Recovery Strategies :
Name Lyall's Mariposa Lily Recovery Strategy
Status Submitted for peer review/ review by F/P/T partners
PLEASE NOTE: Not all COSEWIC reports are currently available on the SARA Public Registry. Most of the reports not yet available are status reports for species assessed by COSEWIC prior to May 2002. Other COSEWIC reports not yet available may include those species assessed as Extinct, Data Deficient or Not at Risk. In the meantime, they are available on request from the COSEWIC Secretariat.
9 record(s) found.
- COSEWIC Status Reports (1 record(s) found.)
- COSEWIC Assessments (1 record(s) found.)
- Response Statements (1 record(s) found.)
- Management Plans (1 record(s) found.)
- Orders (2 record(s) found.)
- COSEWIC Annual Reports (1 record(s) found.)
- Consultation Documents (1 record(s) found.)
- Recovery Document Posting Plans (1 record(s) found.)
COSEWIC Status Reports
COSEWIC Annual Reports
Recovery Document Posting Plans
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