Wood-poppy (Stylophorum diphyllum) COSEWIC assessment and status report: chapter 11
Technical Summary
Stylophorum diphyllum
Wood-poppy – Stylophore à deux feuilles
Extent and Area Information
[Actual area occupied by the three populations is <1 ha] :
Population Information
List populations with number of mature individuals in each:
Threats (actual or imminent threats to populations or habitats)
- Habitat destruction and modification
- Development
- Invasive species
- Seed predation
- Trespass and recreation
- Genetic contamination
- Trampling
- Collection
Rescue Effect (immigration from an outside source)
Status of outside population(s)? USA:
[other jurisdictions or agencies] : See Table 1
Quantitative Analysis
n/a
Current Status
COSEWIC: Endangered (2000, 2007)
MNR: Endangered
Status and Reasons for Designation
Status: Endangered
Alpha-numeric code: Endangered B1ab(iii)+2ab(iii)
Reasons for Designation: A showy perennial herb of Carolinian woodlands restricted to 3 small and highly fragmented populations occupying very limited areas. The habitat is declining in quality due to the presence of invasive plants and habitat disruption due to recreational activities that increase the risk of trampling. Further potential habitat disruption may occur with the expansion of housing development and other commercial activities adjacent to two of the sites. The species is widely available from nurseries but garden-grown plants cultivated in Canada likely originate from U.S. stocks. Cultivated plants are not included in the COSEWIC assessment.
Applicability of Criteria
Criterion A (Declining Total Population): Threatened A2ace A 35% decline in populations in under 3 generations and continuing decline in habitat quality with ongoing threats from invasive exotic plants and other factors.
Criterion B (Small Distribution, and Decline or Fluctuation): Endangered B1ab(iii)+2ab(iii) EO and AO below limits for endangered and only 3 severely fragmented locations with continuing decline in quality of the habitat.
Criterion C (Small Total Population Size and Decline): Threatened C2a(i) No population with >1000 mature individuals but nearly meeting endangered with only 1 population barely exceeding 250 mature individuals.
Criterion D (Very Small Population or Restricted Distribution): Threatened D1+2<1000 mature individuals and only 3 populations with an AO <20 km².
Criterion E (Quantitative Analysis): None available.
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