Manroot (Marah oreganus) is a perennial vine which grows from a large woody root, producing annual stems bearing tendrils and glossy green leaves with 5-7 lobes. Flowers arise from the leaf axils as separate male and female reproductive structures. Fruits are spherical, tapering to a beak and with dark green stripes and prickles.
Manroot was designated as Endangered by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) as there are fewer than 20 mature plants remaining with no evidence of seedling production. The main threats to the few remaining populations include habitat destruction or degradation (e.g., development, road maintenance/widening, recreational activities), competition from invasive alien plant species, and loss/alteration of habitats due to secondary succession under current fire suppression regimes. In British Columbia, manroot is ranked S1 (critically imperiled) by the Conservation Data Centre and is on the provincial Red list. The B.C. Conservation Framework ranks manroot as a priority #1 under goal #3 (maintain the diversity of native species and ecosystems). Recovery is considered to be biologically and technically feasible.
The population and distribution goal for manroot is to maintain the extant populations within British Columbia, and to re-introduce the species at the extirpated site, if deemed feasible.
The recovery objectives are to
1.Ensure long-term protection1 for the four known populations and habitat of manroot.
2.Assess and mitigate the extent of the main threats to existing manroot populations (e.g., residential development, recreational activities, road maintenance/widening, invasive alien plants and fire suppression).
3.Confirm the distribution of all populations (existing and new locations) in British Columbia.
4.Determine sizes and population trends (reproductive success, seed dispersal, germination rates, etc.) of all known populations.
5.Determine if a population can be re-established
B.C. Ministry of Environment. 2012. Recovery Plan for Manroot (Marah oreganus) in British Columbia. B.C. Ministry of Environment. BC Recovery Strategy (Species at Risk)
Topic: Recovery Planning
Keywords: perrenial, endangered, Committee on the Status of Endangered Wildlife in Canada, COSEWIC, S1, critically imperiled, British Columbia, Conservation Data Centre , CDC, habitat destruction, degradation
Scientific Name: Marah oreganus
English Name: Manroot
Other Identifier: QK495 C96 R42 2012 333.95'321609711 C2012-980198
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