Based on an September 2020 extract of the California Plant Rescue Database, University of California Botanical Garden holds 1 accessions of Clarkia imbricata in orthodox seed collection. We are uncertain as to how many total seeds are in this collection.
Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 4 accessions of Clarkia imbricata in orthodox seed collection. There are as many as 13817 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.
Based on an August 2020 extract of the California Plant Rescue Database, University of California Botanical Garden has collected 1 seed accessions of Clarkia imbricata from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass an unknown number of maternal plants
Proposed land use conversion
Inadequate regulatory mechanisms
Damage associated with trespassers collecting other rare plants
Narrowly endemic to a small area in Sonoma County, California. Historically, four populations were known; currently, there is one natural population, with a total of about 5000 plants, and one planted population with < 400 plants. One historic population may have been extirpated by roadside maintenance; the other was extirpated by Christmas tree farming and weed control activities. The natural population is potentially threatened by conversion to agriculture or other land use change. Unauthorized collection is also a threat.
Vine Hill Clarkia is currently known from two populations in southern Sonoma County, California, one natural and one planted in a reserve. The natural population contains 2,000 to 5,000 plants; the planted population has fluctuated between 200 and 300 plants.
The native population of Vine Hill clarkia was formerly split between two privately owned parcels. Until several years ago, The Nature Conservancy had cooperative agreements with both landowners to protect the population. Since then, the soil on one of the parcels was scraped, and the plants there have been extirpated. The other parcel was sold in 1997 and a portion of the Vine Hill clarkia habitat on this second parcel was disturbed. Plants may not reestablish on the disturbed soil based on prior observations that the plant depends on the presence of an undisturbed soil crust. The new landowner wants to build on the plant's habitat, but is willing to sell the parcel instead. The California Department of Fish & Game is seeking cooperation to protect this last remaining portion of the native population of Vine Hill clarkia (CDFG 2002).
Additional information is needed to identify suitable sites for reintroduction as well as for vegetation management.
Additional seed collection for long-term storage is desirable.
Be the first to post an update!