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A4144 Dudleya greenei - Dudleya spp. Succulent Scrub Alliance
Type Concept Sentence: The alliance forms an open to intermittent herbaceous layer with Dudleya greenei the dominant herb, and characteristic herbs Carpobrotus chilensis and Atriplex californica. It is found on San Miguel Island and may occur elsewhere in California and possibly Baja California, Mexico.
Common (Translated Scientific) Name: Greene''s Live-forever - Live-forever species Succulent Scrub Alliance
Colloquial Name: Live-forever Succulent Scrub
Hierarchy Level: Alliance
Type Concept: The alliance forms an open to intermittent herbaceous layer. The shrub layer is sparse to open and the tree layer is absent. Dudleya greenei is a dominant herb, and characteristic herbs include Carpobrotus chilensis and Atriplex californica. Those often present are Astragalus miguelensis and Erigeron glaucus. Commonly associated emergent shrubs at sparse cover include Isocoma menziesii, Coreopsis gigantea, and Eriogonum grande. The alliance occurs on San Miguel Island and may occur elsewhere in California and possibly Baja California, Mexico. It has been found on the middle to upper third of a slope at typically northern aspects. Soils are derived from a variety of substrates including volcanic flow rocks and alluvium. Soil textures include moderately coarse, sandy loam. Elevations range from approximately 20 to 140 m.
Diagnostic Characteristics: This alliance is characterized by an open to intermittent herbaceous layer of Dudleya greenei, Carpobrotus chilensis, and Atriplex californica. The overall herbaceous cover ranges from 9 to 43% with Dudleya greenei being the dominant.
Rationale for Nominal Species or Physiognomic Features: No Data Available
Classification Comments: No Data Available
Similar NVC Types: No Data Available
note: No Data Available
Physiognomy and Structure: No Data Available
Floristics: The alliance forms an open to intermittent herbaceous layer. The shrub layer is sparse to open and the tree layer is absent. Dudleya greenei is a dominant herb, and characteristic herbs include Carpobrotus chilensis and Atriplex californica (= Extriplex californica). Those often present are Astragalus miguelensis and Erigeron glaucus. Commonly associated emergent shrubs at sparse cover include Isocoma menziesii, Coreopsis gigantea (= Leptosyne gigantea), and Eriogonum grande.
Species of Interest: Dudleya greenei (CRPR 4.2) is characteristic of the alliance and is endemic to the northern Channel Islands. Astragalus miguelensis (CRPR 4.3) is often present. All of the following species tracked by the CNPS Rare Plant Inventory (2015) occur in one out of four samples of this alliance, Lotus dendroideus var. veatchii (= Acmispon dendroideus var. veatchii) (CRPR 4.3), Eriogonum grande var. rubescens (CRPR 1B.2), Erysimum insulare (CRPR 1B.3) and Malacothrix incana (CRPR 4.3).
Species of Interest: Dudleya greenei (CRPR 4.2) is characteristic of the alliance and is endemic to the northern Channel Islands. Astragalus miguelensis (CRPR 4.3) is often present. All of the following species tracked by the CNPS Rare Plant Inventory (2015) occur in one out of four samples of this alliance, Lotus dendroideus var. veatchii (= Acmispon dendroideus var. veatchii) (CRPR 4.3), Eriogonum grande var. rubescens (CRPR 1B.2), Erysimum insulare (CRPR 1B.3) and Malacothrix incana (CRPR 4.3).
Dynamics: No Data Available
Environmental Description: No Data Available
Geographic Range: No Data Available
Nations: MX?,US
States/Provinces: CA, MXBCN?
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.934838
Confidence Level: Low - Poorly Documented
Confidence Level Comments: No Data Available
Grank: GNR
Greasons: No Data Available
| Type | Name | Database Code | Classification Code |
|---|---|---|---|
| Class | 3 Desert & Semi-Desert Class | C03 | 3 |
| Subclass | 3.A Warm Desert & Semi-Desert Woodland, Scrub & Grassland Subclass | S06 | 3.A |
| Formation | 3.A.2 Warm Desert & Semi-Desert Scrub & Grassland Formation | F015 | 3.A.2 |
| Division | 3.A.2.Na North American Warm Desert Scrub & Grassland Division | D039 | 3.A.2.Na |
| Macrogroup | 3.A.2.Na.4 Saguaro - Organ Pipe Cactus - Burrobush Mojave-Sonoran Semi-Desert Scrub Macrogroup | M088 | 3.A.2.Na.4 |
| Group | 3.A.2.Na.4.a Coastal Agave - Boojum Tree - Tree Yucca / Live-forever species Coastal Succulent Scrub Group | G298 | 3.A.2.Na.4.a |
| Alliance | A4144 Greene''s Live-forever - Live-forever species Succulent Scrub Alliance | A4144 | 3.A.2.Na.4.a |
Concept Lineage: No Data Available
Predecessors: No Data Available
Obsolete Names: No Data Available
Obsolete Parents: No Data Available
Synonomy: = Dudleya greenei - Dudleya spp. Succulent Scrub Alliance (Rodriguez et al. 2017)
- Faber-Langendoen, D., J. Drake, M. Hall, G. Kittel, S. Menard, C. Nordman, M. Pyne, M. Reid, M. Russo, K. Schulz, L. Sneddon, K. Snow, and J. Teague. 2013-2019b. Screening alliances for induction into the U.S. National Vegetation Classification: Part 1 - Alliance concept review. NatureServe, Arlington, VA.
- Junak, S., D. A. Knapp, J. R. Haller, R. Philbrick, A. Schoenherr and T. Keeler-Wolf. 2007. The Channel Islands. Chapter 9 in: M. G. Barbour, T. Keeler-Wolf and A. A. Schoenherr, editors. Terrestrial vegetation of California, third edition. University of California Press, Berkeley.
- Rodriguez, D., K. G. Sikes, T. Keeler-Wolf, G. Kittel, J. Curtis, C. Curley, and J. Evens. 2017. Vegetation classification of Channel Islands National Park. Report to the National Park Service, Fort Collins, CO.
- Schoenherr, A. A., C. R. Feldmeth, and M. J. Emerson. 1999. Natural history of the islands of California. University of California Press, Berkeley, CA.
- Vanderplank, S. 2011. The flora of Greater San QuintÃn, Baja California, Mexico (2005-2010). Aliso 29:65-103.