Goal: Maintain or enhance existing small-leaved rose occurrences with self sustaining populations to increase resilience to environmental and demographic stochasticity, maintain genetic diversity, and improve chances of persistence over the long term (>100 years) in chaparral and coastal sage scrub vegetation communities.
Management units: 3
In 2021, inspect small-leaved rose occurrences on Conserved Lands (see occurrence table) using the regional rare plant IMG monitoring protocol to record abundance and collect habitat and threats covariate data to determine management needs.
|IMP-1||Based upon occurrence status and threats, determine management needs including whether routine management or more intensive management is warranted.||on hold|
|IMP-2||Submit project metadata, monitoring datasets and management recommendations to the MSP Web Portal.||on hold|
|Surveys Completed in 2021 with Management Recommendations||2021|
|Threat Name||Threat Code|
|Human uses of the Preserves||HUMUSE|
Management units: 3
Beginning in 2017, conduct routine management actions as identified through the IMG monitoring conducted in 2016 and 2021 at the small-leaved rose occurrences on Conserved Lands (see occurrence table). Depending on the type and level of threat, management should be conducted as needed, not necessarily every year, and using BMPs with precautions to do no harm.
|IMP-1||Perform as needed routine management activities, such as protecting occurrences from disturbance through fencing and enforcement and controlling invasive non-native plant species to less than 20% absolute cover.||on hold|
|IMP-1||Perform as needed routine management activities, such as protecting occurrences from disturbance through fencing and enforcement and controlling invasive non-native plant species to less than 20% absolute cover.||available for implementation|
|IMP-2||Submit project metadata and management data to the MSP Web Portal.||on hold|
|IMP-2||Submit project metadata and management data to the MSP Web Portal.||available for implementation|
|Routine Management Completed as Needed Based Upon Monitoring Recommendations||2021|
|Threat Name||Threat Code|
|Human uses of the Preserves||HUMUSE|
2021-2026 Rare Plant Regional Discovery Surveys
Starting in 2021, surveys were conducted on suitable habitat on Conserved Lands to document whether historic plant occurrences were extant and to discover new occurrences for rare plant species. The purpose of these surveys is to refine and update the distribution of these plants in the Management and Monitoring Strategic Plan Area. Voucher specimens and photographs are taken for each occurrence. Some species are already part of the Rare Plant Inspect and Manage Program and any new occurrences for these species will be included in future monitoring. In the next update of the Management and Monitoring Strategic Plan (2027), species not formerly monitored will be evaluated and potentially added to the Rare Plant Inspect and Manage Program. Botanists surveyed for four rare plant species in 2021: San Diego coastalcreeper (Aphanisma blitoides), Blochman’s dudleya (Dudleya blochmaniae), coast wallflower (Erysimum ammophilum), and Orcutt’s bird’s-beak (Dicranostegia orcuttiana). In 2022, botanists surveyed for: San Diego coastalcreeper (Aphanisma blitoides), Baja California oat grass (Sphenopholis interrupta ssp californica), San Diego ambrosia (Abrosia pumila), Wiggins’ cryptantha (Crytantha wigginsii). In 2023, botanists will survey for five rare plant species: Deane’s milkvetch (Astragalus deanei), Parish brittlescale (Atriplex parishii), Mexican flannelbush (Fremontodendron mexicanum), Jennifer’s monardella (Monardella stoneana ), and small-leaved rose (Rosa minutifolia).
Rare Plant Inspect and Manage Monitoring 2014-2026
From 2014-2026, a Management and Monitoring Strategic Plan (MSP Roadmap) monitoring objective for 30 rare plant species is to inspect occurrences to determine management needs. The inspect and manage (IMG) objective is implemented to document the status of rare plant occurrences and assess habitats and threats to develop specific management recommendations. IMG monitoring is implemented by a combination of land managers and contracted biologists in coordination with the SDMMP. Available rare plant data is posted below. New annual updates are typically posted in March. Based upon an evaluation of these data, a 2014-2026 monitoring schedule has been developed for the 30 rare plant species (attached below). Coordinating data collection across the region allows analyses of species and population trends over time and provides a better understanding of the association between habitat and threat covariates and population dynamics.
|File name||Lead Author||Year||Type|
|DRAFT EXISTING CONDITIONS REPORT for the OTAY RANCH PRESERVE||2009||report|
|Management Strategic Plan (MSP) 2014 Monitoring Protocol for Rare Plant Occurrences on Conserved Lands in Western San Diego County||San Diego Management and Monitoring Program||2014||report|
|Management Strategic Plan (MSP) 2015 Monitoring Protocol for Rare Plant Occurrences on Conserved Lands in Western San Diego County||San Diego Management and Monitoring Program||2015||report|
|San Diego Rare Plant Monitoring Plan: Fiscal Year 2011||Greer, Keith; McEachern, Kathryn; Tracey, Jeff||2011||report|
|San Diego Regional Rare Plant Index Plot Survey Form - Small-leaved rose protocol testing 2011||Greer, Keith; Miller, Betsy||2011||field notes/data sheets|
|Summary Results of Rare Plant Field Monitoring City of San Diego MSCP||2009||fact sheet|
Distributed primarily along mesas and canyons near the coast in Baja California, Mexico, although it extends north into the very southern part of San Diego County . There is a transplanted occurrence and one potentially extant natural occurrence in MU3 in the MSPA. 
In the U.S. occurs in Diegan coastal sage scrub and in Baja California occurs in mesas and arroyos near the coast.  Found on rocky to heavy clay soils. 
Member of Rosaceae but does not belong to the same clade that includes most North America taxa and Asian and European taxa4. Most rose species in North America are the result of multiple introductions from European and Asian taxa. It is not determined if small-leaved rose originated in North America or in Europe or Asia.
Dicot shrub. Seeds collected from small-leaved rose plants in Baja California had low viability and were slow to germinate. 
Generally blooms March to July.  although flowering is unpredictable based on observations of the transplanted shrubs and appears to be dependent on the amount and timing of rainfall. 
Potential pollinators include bees. 
Lack of genetic diversity as transplanted occurrence consists of clones from a single plant. Vulnerable to loss from MSPA from a catastrophic event such as fire. Over the long-term the transplanted occurrence may be impacted by shrub overgrowth .
Special considerations: Originally, one shrub was located on Otay Mesa and was salvaged and divided into plants and cuttings that were transplanted to Dennery Canyon area.  Transplant success was high and occurrence appears stable over the short-term and relatively protected from threats. In 2009, two rose bushes were reported at the Otay Ranch Preserve‘s San Ysidro parcel, although these plants have not been found during subsequent surveys. [7,8]
 Reiser, C. 1994. Rare Plants of San Diego County. http://sandiego.sierraclub.org/rareplants/ Accessed 2012 and 2013.
 MSP-MOM. 2013. Management Strategic Plan Master Occurrence Matrix. http://www.sdmmp.com/Home.aspx
 Scheid, Gerald A. and Jennifer J. McAller. 2005. Year 5 Final Mitigation Monitoring Report for the Small-leaved Rose Translocation Project on the Ocean View Hills Property (Formerly California Terraces and Otay Corporate Center. Prepared for Pardee Homes.
 Bruneau, A., J.R. Starr, and J. Simon. 2007. Phylogenetic relationships in the genus Rosa: new evidence from chloroplast DNA sequences and an appraisal of current knowledge. Systematic Botany 32:366-378.
 Calflora. 2013. Small-leaved Rose. www.calflora.net/bloomingplants/smallleavedrose.html
 Greer, K. 2013. Personal Communication.
 Dudek and Associates. 2010. Baseline Biodiversity Survey for the Otay Ranch Preserve. Prepared for the County of San Diego.
 Dodero, M. 2013. Comment on the draft Management Strategic Plan version 01-07-13.