Name:
Festuca idahoensis ssp. roemeri - Cerastium arvense - Koeleria macrantha Grassland
Reference:
NatureServe Biotics 2019
Description:
This grassland association occurs only in the Puget Lowland of western Washington and the Georgia Basin of southwestern British Columbia, primarily in the rainshadow of the Olympic Mountains and Vancouver Island mountains from sea level to 625 m elevation. Stands are confined to very dry sites that are typically very shallow to bedrock, and on southern to western aspect slopes. It probably burned relatively frequently in pre-European settlement times, and its continued survival on at least some sites is dependent on disturbance to remove trees. This medium-tall bunch grassland has variable cover of forbs, mosses and lichens. Scattered trees are sometimes present, especially <i>Pseudotsuga menziesii</i>, and scattered dwarf-shrubs sometimes occur, especially <i>Mahonia aquifolium</i>. <i>Festuca idahoensis ssp. roemeri</i> is always present and usually dominant, though <i>Danthonia californica</i> or <i>Festuca rubra</i> (native varieties) are sometimes codominant and occasionally dominant, especially on sites moderately impacted by past grazing. The moss <i>Racomitrium canescens</i> and the clubmoss <i>Selaginella wallacei</i> are usually present and often have high percent cover. Of the many herbaceous species that occur, the following have high constancy: <i>Koeleria macrantha, Elymus glaucus, Cerastium arvense, Achillea millefolium, Allium acuminatum, Eriophyllum lanatum</i>, and <i>Zigadenus venenosus</i>. This association is distinguished from similar associations by >10% combined cover of <i>Festuca idahoensis ssp. roemeri</i>, native <i>Festuca rubra</i>, and <i>Danthonia californica</i>, along with the presence of <i>Cerastium arvense, Selaginella wallacei</i>, or <i>Elymus glaucus</i>, in combination with the presence of at least one of the following: <i>Camassia quamash, Aspidotis densa, Koeleria macrantha</i>.
Accession Code:
urn:lsid:vegbank.org:commConcept:32231-{7BC1AEEC-FE9C-4E0D-B08D-465ECD2989F4}
Plot-observations of this Community Concept:
0
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