Lindley's False Silverpuffs
Scientific Name: Uropappus lindleyi
Taxonomy Group: Vascular Plants
Range: British Columbia
Last COSEWIC Assessment: April 2008
Last COSEWIC Designation: Endangered
SARA Status: Schedule 1, Endangered
Image of Lindley's False Silverpuffs
Lindley’s False Silverpuffs is an annual 10 to 70 cm tall. It usually has an unbranched stem. The basal leaves, which are 15 to 30 cm long, are narrow and long-pointed. The stem leaves are usually long and narrow; they grow on the bottom half of the stem. The flowers grow at the tips of flower stalks. These flowers are actually heads composed of many small yellow flowers on a common receptacle. The base of the head is surrounded by a group of small leaves, called bracts. These bracts, which are shaped like the head of a lance, are 15 to 30 mm long. The seeds are contained in dry fruit called achenes. The achenes are 7 to 17 mm long, slender, blackish, finely ribbed and crowned by a tuft of fine white hairs.
Distribution and Population
The range of Lindley’s False Silverpuffs extends from southwestern British Columbia disjunctly to Idaho and central Washington and south to Oregon, Utah, Texas, New Mexico, Arizona and California. It was previously observed in 1956 in the San Juan Islands in northwestern Washington. In Canada, Lindley’s False Silverpuffs is known from only the Gulf Islands in southwestern British Columbia. The species was first reported in 1974 in five localities in the Gulf Islands (Ruxton, North Pender, Galiano and Saturna islands), where it was still extant during the most recent surveys, in 2003 and 2004. One additional population was recorded in 1998, on southern Vancouver Island. This population has probably since been extirpated as a result of housing development. Existing population sizes range from 20 to 1200 plants. The total Canadian population is estimated at about 2000 individuals. Population trends are not known, and they will be difficult to assess because this species is an annual. The potential for rescue from the closest populations in the United States, 300 km away, is very low. Even locally, seed or pollen exchanges are rare, since existing populations are 10 to 15 km apart.
Populations of Lindley’s False Silverpuffs in British Columbia are found in Garry oak stands or neighbouring areas in southeastern Vancouver Island and the adjacent Gulf Islands. This area is in a rain shadow cast by the Olympic Mountains to the southwest and the Vancouver Island Ranges to the west, and it has a relatively warm and dry Mediterranean-like climate. The species is found in several different habitats, ranging from sandstone cliffs and steep, grassy slopes to dry, open deciduous or evergreen forests. On sandstone cliffs, the plants grow in cracks and on ledges among the few other plants growing there, such as Alaska brome and great camas. The steep, grassy slope locations are occupied mainly by exotic species such as early hairgrass and ripgut brome. Habitat trends for Lindley’s False Silverpuffs in Canada are unknown, but the species undoubtedly faces the same threats as the Garry oak ecosystems in which it is found—agricultural development, urbanization and invasion by aggressive introduced species.
In British Columbia, flowering of Lindley’s False Silverpuffs has been observed from late April to mid-May, with seed production occurring in mid-May to June. The flowers in this annual can be fertilized by their own pollen. Mature flowers and others still in bud can be found on the same plant. The ring of fine hairs with their bristly tips at the top of the fruit could attach to bird feathers, and this may possibly enable long-distance dispersal. Most seeds, however, are probably dispersed locally by wind and gravity.
In British Columbia, the most immediate threat to Lindley’s False Silverpuffs is habitat destruction through housing development. Nearly all the populations are located on highly desirable private property with ocean views. A marked increase in housing development on Salt Spring Island is related to the 78% increase in the human population between 1986 and 2001. Growth projections indicate a further increase of 43% by 2026. By increasing the geographic isolation of the populations, habitat destruction also threatens the species indirectly. Significant fragmentation of the habitat limits the ability of the species to become established in new locations or to re-establish extirpated populations. In addition, a large proportion of the remaining habitat suitable for Lindley’s False Silverpuffs has been heavily altered by introduced species.
Federal ProtectionThe Lindley's False Silverpuffs is protected under the federal Species at Risk Act (SARA). More information about SARA, including how it protects individual species, is available in the Species at Risk Act: A Guide.
In British Columbia, Lindley’s False Silverpuffs is not protected under any provincial statute.
Provincial and Territorial Protection
Status of Recovery Planning
Recovery Strategies :
Name Recovery Strategy for the Lindley's False Silverpuffs (Uropappus lindleyi) in Canada
Status Final posting on SAR registry
Garry Oak Ecosystems Recovery Team
Conan Webb - Chair/Contact - Parks Canada
Phone: 250-478-5153 Send Email
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.)
- Recovery Strategies (1 record(s) found.)
- Orders (2 record(s) found.)
- COSEWIC Annual Reports (1 record(s) found.)
- Consultation Documents (1 record(s) found.)
- Exceptions (1 record(s) found.)
COSEWIC Status Reports
COSEWIC Annual Reports
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