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CEGL003179 Arctostaphylos hookeri ssp. montana Shrubland
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Mount Tamalpais Manzanita Shrubland
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This association is endemic to the Golden Gate National Recreation Area and adjacent areas on Mount Tamalpais State Park, California. Stands are found at rocky serpentine ridgetops or the upper third of south-facing slopes that are convex or curved. Soils are moderately coarse and gravelly sandy loams derived from serpentine. Stands of this shrubland form an intermittent herb layer 25-50 cm tall and an intermittent shrub layer 0.5 to 1 m tall. It is strongly dominated by Arctostaphylos hookeri ssp. montana, a rare species generally found on serpentine outcrops on Mount Tamalpais. Adenostoma fasciculatum and Arctostaphylos glandulosa ssp. glandulosa are also found in this association. Heteromeles arbutifolia, Calamagrostis ophitidis, Melica sp., Clarkia sp., Vulpia myuros, Eriodictyon californicum, Pseudotsuga menziesii, Castilleja foliolosa, Iris douglasiana, and Hypericum concinnum may also contribute minor cover. Compared to the other chaparral associations on serpentine in the Mount Tamalpais area, this association is lower in stature and occupies the tops of ridgelines or dry exposed south-facing upper slopes.
Diagnostic Characteristics: No Data Available
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: Stands of this shrubland form an intermittent herb layer averaging 40% cover at 25-50 cm tall and an intermittent shrub layer averaging 35% cover at 0.5 to 1 m tall. It is strongly dominated by Arctostaphylos hookeri ssp. montana, a rare species generally found on serpentine outcrops on Mount Tamalpais, making up about 70-90% relative cover of the stands. Adenostoma fasciculatum and Arctostaphylos glandulosa ssp. glandulosa are also found at this association. Heteromeles arbutifolia, Calamagrostis ophitidis, Melica sp., Clarkia sp., Vulpia myuros, Eriodictyon californicum, Pseudotsuga menziesii, Castilleja foliolosa, Iris douglasiana, and Hypericum concinnum may also contribute minor cover. Compared to the other chaparral associations on serpentine in the Mount Tamalpais area, this association is lower in stature and occupies the tops of ridgelines or dry exposed south-facing upper slopes.
Dynamics: No Data Available
Environmental Description: Stands are found at rocky serpentine ridgetops or the upper third of south-facing slopes that are convex or curved. Soils are moderately coarse and gravelly sandy loams derived from serpentine.
Geographic Range: This association is only known from the Golden Gate National Recreation Area and adjacent areas on Mount Tamalpais State Park, California. Because the characteristic species is endemic to Mount Tamalpais the global extent is essentially the same as the local extent.
Nations: US
States/Provinces: CA
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.684237
Confidence Level: Moderate
Confidence Level Comments: No Data Available
Grank: G1
Greasons: No Data Available
| Type | Name | Database Code | Classification Code |
|---|---|---|---|
| Class | 2 Shrub & Herb Vegetation Class | C02 | 2 |
| Subclass | 2.B Temperate & Boreal Grassland & Shrubland Subclass | S18 | 2.B |
| Formation | 2.B.1 Mediterranean Scrub & Grassland Formation | F038 | 2.B.1 |
| Division | 2.B.1.Na Californian Scrub & Grassland Division | D327 | 2.B.1.Na |
| Macrogroup | 2.B.1.Na.1 Chamise - Whiteleaf Manzanita - Scrub Oak Chaparral Macrogroup | M043 | 2.B.1.Na.1 |
| Group | 2.B.1.Na.1.c Woolly-leaf Manzanita - Glossyleaf Manzanita - Barranca Brush Maritime Chaparral Group | G258 | 2.B.1.Na.1.c |
| Alliance | A3858 Brittleleaf Manzanita - Woolly-leaf Manzanita Central Coast & Island Chaparral Alliance | A3858 | 2.B.1.Na.1.c |
| Association | CEGL003179 Mount Tamalpais Manzanita Shrubland | CEGL003179 | 2.B.1.Na.1.c |
Concept Lineage: No Data Available
Predecessors: No Data Available
Obsolete Names: No Data Available
Obsolete Parents: No Data Available
Synonomy: = Arctostaphylos hookeri (Hooker’s manzanita chaparral) Provisional Alliance (Sawyer et al. 2009) [37.321.00]
= Hooker Manzanita (Arctostaphylos hookeri ssp. montana) Alliance (Schirokauer et al. 2003) [pi code 21440]
= Hooker Manzanita (Arctostaphylos hookeri ssp. montana) Alliance (Schirokauer et al. 2003) [pi code 21440]
- Sawyer, J. O., T. Keeler-Wolf, and J. Evens. 2009. A manual of California vegetation. Second edition. California Native Plant Society, Sacramento CA. 1300 pp.
- Schirokauer, D., T. Keeler-Wolf, J. Meinke, and P. van der Leeden. 2003. Plant community classification and mapping project. Point Reyes National Seashore, Golden Gate National Recreation Area, San Francisco Water Department Watershed Lands, Mount Tamalpais, Tomales Bay, and Samuel P. Taylor State Parks. Final report. California State Department of Fish and Game, Wildlife and Habitat Data Analysis Branch, Sacramento, National Park Service, Point Reyes Station, and Aerial Information Systems, Redlands, CA. 82 pp. [http://biology.usgs.gov/npsveg/pore_goga/index.html]
- Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.