ITIS Basic Information
Common Name: Sticky Dudleya
Scientific Name: Dudleya viscida
Species Code: DUDVIS
Management Category: SS (species not considered at risk of loss but still requires management)
Occurrence Map

Historically present
Currently present
Currently not detected
Table of Occurrences
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Species Information

MSP Species Background

Goals and Objectives

Goal: Maintain or enhance existing sticky dudleya 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.

regional and/or local NFO 2021 SS
MON-IMP-IMG DUDVIS-1

Management units: 6

In 2021, inspect sticky dudleya 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.

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. on hold
IMP-2 Submit project metadata, monitoring datasets and management recommendations to the MSP Web Portal. on hold
Criteria Deadline year
Surveys Completed in 2021 with Management Recommendations 2021
Threat Name Threat Code
Human uses of the PreservesHUMUSE
Invasive plantsINVPLA
Code Obj. code Statement
DUDVIS-2 MGT-IMP-IMG Beginning in 2017, conduct routine management actions as identified through the IMG monitoring conducted in 2016 and 2021 at sticky dudleya 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.
DUDVIS-2 MGT-IMP-IMG Beginning in 2017, conduct routine management actions as identified through the IMG monitoring conducted in 2016 and 2021 at sticky dudleya 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.
local NFO 2017, 2018, 2019, 2020, 2021 SS
MGT-IMP-IMG DUDVIS-2

Management units: 6

Beginning in 2017, conduct routine management actions as identified through the IMG monitoring conducted in 2016 and 2021 at sticky dudleya 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.

Action Statement Action status Projects
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 =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
Code Obj. code Statement
DUDVIS-1 MON-IMP-IMG In 2021, inspect sticky dudleya 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.
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

Endemic to southwestern California occurring in southeastern Orange, southwestern Riverside, and northwestern San Diego Counties [1]. Most occurrences are in the Santa Ana Mountains. There are 4 occurrences in MU 6[2].

List Status

None

Habitat Affinities

Found on steep rocky north facing slopes in chaparral and coastal sage scrub [1]. Often found on gabbroic rock and growing in very shallow soils or from vertical rock.

Taxonomy and Genetics

In the family Crassulaceae. Dudleya is a difficult genus with much hybridization and closely related species [4]. The original base chromosome number in Crassulaceae is thought to be 8 and polyploidy has played an important role in the evolution of clades. The genus Dudleya belongs to clade Leucosedum which is widespread in the southwest United States, Mexico and Europe with most taxa having base chromosome numbers of 6 or 7. However, the meiotic chromosome number of sticky dudleya is n=17.

Life History Demography

Herbaceous perennial [3].

Seasonal Phenology

looms May through June [5].

Pollination Seed Dispersal

No information.

Threats

Threatened by the release of water from upstream reservoirs, trampling by hikers and climbers, and invasive plants, especially those escaped from cultivation in the urban-wildland interface [6, 7].

Special Considerations:

Sticky dudleya has been successfully translocated and seeded into cut and fill slopes above Highway 7 [6,8].

Literature Sources

[1] Reiser, C. 1994. Rare Plants of San Diego County. http://sandiego.sierraclub.org/rareplants/ Accessed 2012 and 2013.

[2] MSP-MOM. 2013. Management Strategic Plan Master Occurrence Matrix. http://www.sdmmp.com/Home.aspx

[3] Calflora. 2013. Sticky Dudleya. www.claflora.org/

[4] Mort, M.E., D. E. Soltis, P.S. Soltis, J. Francisco-Ortega and A. Santos-Guerra. 2001. Phylogenetic relationships and evolution of Crassulaceae inferred from matK sequence data. Journal of Botany 88:76-91.

[5] Munz, P.A. 1974. A Flora of Southern California. University of California Press, Berkeley, California.

[6] Dodero, M. 2013. Personal Communication.