Gabbro Soils and Plant Distributions on Them

@inproceedings{Alexander2011GabbroSA,
  title={Gabbro Soils and Plant Distributions on Them},
  author={Earl B. Alexander},
  year={2011}
}
Abstract Gabbro is a mafic rock with many species that do not occur on soils of granitic or ultramafic rocks. Although some gabbro soils harbor many unique or endemic species, others do not, as botanists have noted from the Appalachian Piedmont to the mountains of California and Oregon. Gabbro soils were sampled in the Peninsular Ranges and in the foothills of the Sierra Nevada to identify special features of the gabbro soils with unique plant species distributions. No soil morphological or… 
Gabbro Soil-Plant Relations in the California Floristic Province
Abstract The paper reviews published botanical and pedological literature concerning gabbro in the California Floristic Province. Gabbro is a mafic plutonic rock that is common in the Sierra Nevada,
Comment on the Gabbro Soils of Pine Hill
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Data indicate that the greatest differences between the surface soils at sites with different ceanothus species were different amounts of Mehlich III (dilute acids and EDTA) extractable P.
Foliar Analyses of Conifers On Serpentine and Gabbro Soils In the Klamath Mountains
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The high Mg in the serpentine soils may interfere with the utilization of Ca by Douglas-fir trees causing their foliage to have lower Ca concentrations than in the foliage of Douglas- fir trees on gabbro soils, and for each of the three tree species, foliar N, P, and K concentrations were not appreciably different on serpentine versus gabb ro soils.
Soil Chemistry Patterns In An Edaphic Endemism Hotspot: The Pebble Plains of the San Bernardino Mountains, California
Abstract Pebble plains are a unique edaphic environment known only from the high valleys of the San Bernardino Mountains, California. The pebble plains have long been celebrated for the high vascular
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Abstract Ceanothus otayensis McMinn (Rhamnaceae) was previously known only from metavolcanic-derived soils of the northern Peninsular Ranges—predominantly the San Ysidro Mountains—in San Diego
Carex xerophila (Cyperaceae), a New Sedge from the Chaparral of Northern California
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Three Edaphic-Endemic Ceanothus (Rhamnaceae) New to Science
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Three new taxa of Ceanothus are described, two initially noted among existing collections, and another discovered during botanical exploration in San Diego County, which are edaphic micro-endemics found only in the southern California Floristic Province, California.
Limited hybridization across an edaphic disjunction between the gabbro-endemic shrub Ceanothus roderickii (Rhamnaceae) and the soil-generalist Ceanothus cuneatus.
TLDR
There is little genetic exchange between the focal species across an edaphic disjunction, despite the absence of prezygotic barriers, implying that soil conditions, as well as other extrinsic factors, should be considered as forces that may restrict hybridization and gene flow in Ceanothus, influencing local adaptation and speciation.

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