Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 4 accessions of Thelypodium stenopetalum in orthodox seed collection. There are as many as 19471 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.
Endemic to California, Thelypodium stenopetalum is known from 10 total, and perhaps as few as 3 or 4 extant, occurrences in the meadows of Big Bear Basin in San Bernardino County. It is protected in part at Baldwin Lake Ecological Reserve. Seriously threatened by urbanization, ORVs, weeds, grazing and burros. Ownership is a mix of USFS, DFG, Private and City lands.
Thelypodium stenopetalum populations are subject to several impacts leading to destruction, alteration and fragmentation of habitat. Threats include:
Alteration of hydrologic regimes
Unauthorized livestock grazing
Thelypodium stenopetalum exhibits high variation in population size based on conditions related to climate. This species is more abundant in years with above average rainfall (USDA FS 2007).
Little is known about the biology and ecology of T. stenopetalum.
A recovery plan for T.stenopetalum was approved in July 1998 (USFWS 1998). The recovery plan identifies criteria for downlisting T. stenopetalum and recovery tasks that could include San Bernardino National Forest management or cooperation and/or National Forest System lands.The following list of conservation practices should be considered for T. stenopetalum:
Continue implementation of the 1998 recovery plan for T. stenopetalum, and the revised Recovery Plan when completed.
Implement actions in the SBNF Meadow Habitat Management Guide.
Continue to monitor fence lines and signing that protects populations and reconstruct in a timely manner as necessary. Work with adjacent landowners to reduce effects of unclassified trail use on NFS lands.
Survey all new occurrences of T. stenopetalum and any occurrences that have not been visited in the past ten years, and record occurrence status, habitat condition, and threats.
Apply the habitat suitability criteria and detection protocol developed for this taxon to surveys at the project level.
Collect a herbarium voucher specimen of T. stenopetalum to document new occurrences or to verify a historical occurrence if the occurrence is not known to have been documented in at least ten years prior.
San Bernardino National Forest occasionally performs surveys for this species; according to the Habitat Management Guide populations should be monitored every ten years.
Establish and maintain a genetically representative seed bank.
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