Basic Information
Common Name: Blochman's Dudleya
Scientific Name: Dudleya blochmaniae
Species Code: DUDBLO
Management Category: SL (species at risk of loss)
Occurrence Map
Table of Occurrences
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Species Information

MSP Species Background

Goals and Objectives

Goal: Maintain or enhance existing Blochman's dudleya occurrences and re-establish historic occurrences, as needed, to ensure multiple conserved occurrences with self sustaining populations to increase resilience to environmental and demographic stochasticity, maintain genetic diversity, and ensure persistence over the long term (>100 years) in coastal sage scrub vegetation communities.

regional and/or local NFO 2017, 2018, 2019, 2020, 2021 SL
MON-IMP-IMG DUDBLO-1

Management units: 1, 6

From 2017-2021, inspect Blochman's dudleya occurrences annually on Conserved Lands (see occurrence table) using the IMG regional monitoring protocol to record abundance and collect habitat and threats covariate data to determine management needs.

Action Statement Action status Projects
IMP-1 Based upon occurrence status and threats, determine management needs including whether routine management or more intensive management is warranted. in progress
IMP-2 Submit project metadata, monitoring datasets and management recommendations to the MSP Web Portal. in progress
Criteria Deadline year
Annual Surveys Completed with Management Recommendations 2021
Threat Name Threat Code
Human uses of the PreservesHUMUSE
Invasive plantsINVPLA
Loss of connectivityLOSCON
Urban developmentURBDEV
Code Obj. code Statement
DUDBLO-2 MGT-IMP-IMG Beginning in 2017, conduct routine management actions identified through the IMG monitoring at Blochman's dudleya occurrences on Conserved Lands (see occurrence table). Depending on the type and level of threat, management should only be conducted as needed, not necessarily every year, and using BMPs with precautions to do no harm.
DUDBLO-4 MGT-PRP-SBPL In 2021, begin preparing a section for Blochman's dudleya in the MSP Seed Collection, Banking and Bulking Plant to preserve genetic diversity and rescue occurrences in case of catastrophic disturbance. The plan should incorporate best science and management practices (e.g., Wall 2009, KEW 2016) and provide guidelines for collecting and storing seeds over the long term at a permanent, established conservation seed bank (e.g., Institute for Conservation Research Native Plant Seed Bank, Rancho Santa Ana Botanic Garden Seed Conservation Program) and for providing a source of seeds for management purposes. The plan should include recommendations for: collecting and storing seeds for conservation banking; management oriented research; rescuing occurrences after catastrophic disturbances; and seed bulking and out-planting to augment extant occurrences or to establish new occurrences with consideration of genetic implications for population sustainability.
DUDBLO-6 MGT-PRP-MGTPL In 2021, begin preparing a section for Blochman's dudleya in the MSP Rare Plant Management Plan that prioritizes management actions to maintain or expand conserved occurrences based upon an assessment of data on occurrence status habitat and threats. Minimum criteria for enhancement are to reduce invasive annual nonnative plants and thatch to at least 20% absolute cover within the occurrence
local NFO 2017, 2018, 2019, 2020, 2021 SL
MGT-IMP-IMG DUDBLO-2

Management units: 1, 6

Beginning in 2017, conduct routine management actions identified through the IMG monitoring at Blochman's dudleya occurrences on Conserved Lands (see occurrence table). Depending on the type and level of threat, management should only be conducted as needed, not necessarily every year, and using BMPs with precautions to do no harm.

Action Statement Action status Projects
IMP-1 Perform routine management activities as needed, such as protecting occurrences from disturbance through enforcement and controlling invasive non-native plant species to =20% absolute cover. available for implementation
IMP-2 Submit project metadata and management data to the MSP Web Portal. available for implementation
Criteria Deadline year
Routine Management Completed as Needed Based Upon Monitoring Recommendations 2021
Threat Name Threat Code
Human uses of the PreservesHUMUSE
Invasive plantsINVPLA
Loss of connectivityLOSCON
Urban developmentURBDEV
Code Obj. code Statement
DUDBLO-1 MON-IMP-IMG From 2017-2021, inspect Blochman's dudleya occurrences annually on Conserved Lands (see occurrence table) using the IMG regional monitoring protocol to record abundance and collect habitat and threats covariate data to determine management needs.
DUDBLO-1 MON-IMP-IMG From 2017-2021, inspect Blochman's dudleya occurrences annually on Conserved Lands (see occurrence table) using the IMG regional monitoring protocol to record abundance and collect habitat and threats covariate data to determine management needs.
DUDBLO-4 MGT-PRP-SBPL In 2021, begin preparing a section for Blochman's dudleya in the MSP Seed Collection, Banking and Bulking Plant to preserve genetic diversity and rescue occurrences in case of catastrophic disturbance. The plan should incorporate best science and management practices (e.g., Wall 2009, KEW 2016) and provide guidelines for collecting and storing seeds over the long term at a permanent, established conservation seed bank (e.g., Institute for Conservation Research Native Plant Seed Bank, Rancho Santa Ana Botanic Garden Seed Conservation Program) and for providing a source of seeds for management purposes. The plan should include recommendations for: collecting and storing seeds for conservation banking; management oriented research; rescuing occurrences after catastrophic disturbances; and seed bulking and out-planting to augment extant occurrences or to establish new occurrences with consideration of genetic implications for population sustainability.
DUDBLO-6 MGT-PRP-MGTPL In 2021, begin preparing a section for Blochman's dudleya in the MSP Rare Plant Management Plan that prioritizes management actions to maintain or expand conserved occurrences based upon an assessment of data on occurrence status habitat and threats. Minimum criteria for enhancement are to reduce invasive annual nonnative plants and thatch to at least 20% absolute cover within the occurrence
Regional NFO 2019 SL
MON-SURV-SPEC DUDBLO-3

Management units: 1, 2, 6, 7

In 2019, survey historic Blochman's dudleya locations to determine occurrence status; survey and delineate potentially suitable habitat for new occurrences; survey existing occurrences to identify the potential for enhancement and expansion; and at all sites collect data on occurrence status, habitat and threats and determine management needs.

Action Statement Action status Projects
SURV-1 At each extant occurrence, map the extent of the occurrence, collect data on abundance, map adjacent suitable habitat for potential occurrence expansion, collect covariate data on threats including estimates of cover of invasive non-native plants and trampling. On hold
SURV-2 Submit project metadata, habitat mapping, and a report with site prioritizations and recommendations for management based upon occurrence status, habitat and threats assessments to the MSP Web Portal. On hold
Criteria Deadline year
Surveys and Report Completed by 2020 2021
Threat Name Threat Code
Human uses of the PreservesHUMUSE
Invasive plantsINVPLA
Loss of connectivityLOSCON
Urban developmentURBDEV
Code Obj. code Statement
DUDBLO-4 MGT-PRP-SBPL In 2021, begin preparing a section for Blochman's dudleya in the MSP Seed Collection, Banking and Bulking Plant to preserve genetic diversity and rescue occurrences in case of catastrophic disturbance. The plan should incorporate best science and management practices (e.g., Wall 2009, KEW 2016) and provide guidelines for collecting and storing seeds over the long term at a permanent, established conservation seed bank (e.g., Institute for Conservation Research Native Plant Seed Bank, Rancho Santa Ana Botanic Garden Seed Conservation Program) and for providing a source of seeds for management purposes. The plan should include recommendations for: collecting and storing seeds for conservation banking; management oriented research; rescuing occurrences after catastrophic disturbances; and seed bulking and out-planting to augment extant occurrences or to establish new occurrences with consideration of genetic implications for population sustainability.
DUDBLO-6 MGT-PRP-MGTPL In 2021, begin preparing a section for Blochman's dudleya in the MSP Rare Plant Management Plan that prioritizes management actions to maintain or expand conserved occurrences based upon an assessment of data on occurrence status habitat and threats. Minimum criteria for enhancement are to reduce invasive annual nonnative plants and thatch to at least 20% absolute cover within the occurrence
Regional NFO 2021 SL
MGT-PRP-SBPL DUDBLO-4

Management units: 1, 2, 6, 7

In 2021, begin preparing a section for Blochman's dudleya in the MSP Seed Collection, Banking and Bulking Plant to preserve genetic diversity and rescue occurrences in case of catastrophic disturbance. The plan should incorporate best science and management practices (e.g., Wall 2009, KEW 2016) and provide guidelines for collecting and storing seeds over the long term at a permanent, established conservation seed bank (e.g., Institute for Conservation Research Native Plant Seed Bank, Rancho Santa Ana Botanic Garden Seed Conservation Program) and for providing a source of seeds for management purposes. The plan should include recommendations for: collecting and storing seeds for conservation banking; management oriented research; rescuing occurrences after catastrophic disturbances; and seed bulking and out-planting to augment extant occurrences or to establish new occurrences with consideration of genetic implications for population sustainability.

Action Statement Action status Projects
PRP-1 Consult the San Diego County Rare Plant Working Group made up of plant ecologists, geneticists, rare plant experts, land managers, restoration practitioners, seed banking and bulking practitioners, wildlife agencies, and other stakeholders to provide input and recommendations for the Blochman's dudleya section in the MSP Seed Collection, Banking and Bulking Plan. some occurrences are in progress
PRP-2 Prepare a seed collection plan to collect seeds over multiple years, collect seeds several times within a season, accumulate seeds across populations, and to sample among habitats and ecological niches. Include guidelines for collecting and storing seeds along maternal lines from small occurrences (<1,000 plants) and to provide propagules to be used in management experiments, enhancement of existing occurrences, and establishment of new occurrences. some occurrences are in progress
PRP-3 The seed collection plan should include guidelines for collecting seeds from occurrences of sufficient size to accommodate harvest and based on genetic studies as available. Include provisions for collecting seed from unconserved populations planned for development. some occurrences are in progress
PRP-4 Include protocols and guidelines for collecting voucher specimens and submitting to the San Diego Natural History Museum (McEachern et al. 2007). some occurrences are in progress
PRP-5 Include guidelines for testing seeds for viability and to obtain information on dormancy and germination rates. some occurrences are in progress
PRP-6 Submit project metadata and MSP Seed Collection, Banking and Bulking Plan to the MSP Web Portal. some occurrences are in progress
Criteria Deadline year
By 2022, Completed Blochman's Dudleya Section in MSP Seed Collection, Banking and Bulking Plan 2021
Threat Name Threat Code
Human uses of the PreservesHUMUSE
Invasive plantsINVPLA
Loss of connectivityLOSCON
Urban developmentURBDEV
Code Obj. code Statement
DUDBLO-1 MON-IMP-IMG From 2017-2021, inspect Blochman's dudleya occurrences annually on Conserved Lands (see occurrence table) using the IMG regional monitoring protocol to record abundance and collect habitat and threats covariate data to determine management needs.
DUDBLO-1 MON-IMP-IMG From 2017-2021, inspect Blochman's dudleya occurrences annually on Conserved Lands (see occurrence table) using the IMG regional monitoring protocol to record abundance and collect habitat and threats covariate data to determine management needs.
DUDBLO-6 MGT-PRP-MGTPL In 2021, begin preparing a section for Blochman's dudleya in the MSP Rare Plant Management Plan that prioritizes management actions to maintain or expand conserved occurrences based upon an assessment of data on occurrence status habitat and threats. Minimum criteria for enhancement are to reduce invasive annual nonnative plants and thatch to at least 20% absolute cover within the occurrence
regional NFO 2021 SL
MGT-PRP-MGTPL DUDBLO-6

Management units: 1, 2, 6, 7

In 2021, begin preparing a section for Blochman's dudleya in the MSP Rare Plant Management Plan that prioritizes management actions to maintain or expand conserved occurrences based upon an assessment of data on occurrence status habitat and threats. Minimum criteria for enhancement are to reduce invasive annual nonnative plants and thatch to at least 20% absolute cover within the occurrence

Action Statement Action status Projects
PRP-1 Consult the San Diego County Rare Plant Working Group made up of plant ecologists, geneticists, rare plant experts, land managers, restoration practitioners, seed banking and bulking practitioners, wildlife agencies, and other stakeholders to provide input and recommendations for Blochman's dudleya in the MSP Rare Plant Management Plan. waiting for precedent action
PRP-2 Develop a conceptual model that identifies management actions to effectively reduce threats to Blochman's dudleya populations. waiting for precedent action
PRP-3 Use occurrence status and threats data to develop management recommendations to reduce threats and promote resilience of occurrences. waiting for precedent action
PRP-4 Develop an implementation plan for Blochman's dudleya that prioritizes management actions for the next 5 years and details tasks, lead entities, responsibilities, and timelines, budgets. waiting for precedent action
PRP-5 Submit project metadata, project datasets, and MSP Rare Plant Management Plan to the MSP Web Portal. waiting for precedent action
Criteria Deadline year
By 2022, Completed Blochman's Dudleya Section in MSP Rare Plant Management Plan 2021
Threat Name Threat Code
Human uses of the PreservesHUMUSE
Invasive plantsINVPLA
Loss of connectivityLOSCON
Urban developmentURBDEV
Code Obj. code Statement
DUDBLO-1 MON-IMP-IMG From 2017-2021, inspect Blochman's dudleya occurrences annually on Conserved Lands (see occurrence table) using the IMG regional monitoring protocol to record abundance and collect habitat and threats covariate data to determine management needs.
DUDBLO-1 MON-IMP-IMG From 2017-2021, inspect Blochman's dudleya occurrences annually on Conserved Lands (see occurrence table) using the IMG regional monitoring protocol to record abundance and collect habitat and threats covariate data to determine management needs.
DUDBLO-3 MON-SURV-SPEC In 2019, survey historic Blochman's dudleya locations to determine occurrence status; survey and delineate potentially suitable habitat for new occurrences; survey existing occurrences to identify the potential for enhancement and expansion; and at all sites collect data on occurrence status, habitat and threats and determine management needs.
DUDBLO-4 MGT-PRP-SBPL In 2021, begin preparing a section for Blochman's dudleya in the MSP Seed Collection, Banking and Bulking Plant to preserve genetic diversity and rescue occurrences in case of catastrophic disturbance. The plan should incorporate best science and management practices (e.g., Wall 2009, KEW 2016) and provide guidelines for collecting and storing seeds over the long term at a permanent, established conservation seed bank (e.g., Institute for Conservation Research Native Plant Seed Bank, Rancho Santa Ana Botanic Garden Seed Conservation Program) and for providing a source of seeds for management purposes. The plan should include recommendations for: collecting and storing seeds for conservation banking; management oriented research; rescuing occurrences after catastrophic disturbances; and seed bulking and out-planting to augment extant occurrences or to establish new occurrences with consideration of genetic implications for population sustainability.
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.

Current Distribution Rangewide

From the central coast of California to southern San Diego, and into northern Baja California, Mexico [1, 2, 3].

Known Populations in San Diego County

Three occurrences on Conserved Lands in MUs 3 (Border Field State Park) and 6 (Carlsbad Oaks North Habitat Conservation Area).

List Status

None [3].

Habitat Affinities

Rocky, often clay or serpentine soils [3]. Primary habitat associations are coastal bluff scrub, chaparral, coastal scrub, and valley and foothill grassland. Elevation range is 5-450 meters.

Taxonomy and Genetics

Crassulaceae family [3]. Northern and southern populations are genetically distinct.

Life History Demography

Herbaceous perennial [3].

Seasonal Phenology

Bloom period is April-June [2].

Threats

Threatened by grazing, trampling, development, erosion, and non-native plants [3].

Special Considerations:

Hybrids with Dudleya edulis suspected [2].

Literature Sources

[1]  McCabe, S. W. 2016. Dudleya blochmaniae subsp. Blochmaniae, in Jepson Flor Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgibin/get_IJM.pl?tid=50229, accessed on August 31, 2016.

[2] “Dudleya Blochmaniae.” 2016. Calflora. http://www.calflora.org/cgi-bin/species_query.cgi?where-taxon=Dudleya+blochmaniae.

[3] CNPS, Rare Plant Program. 2016. Inventory of Rare and Endangered Plants (online edition, v8-02). California Native Plant Society, Sacramento, CA. http://www.rareplants.cnps.org, accessed 31 August 2016.