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Avena fatua - Bromus spp. Ruderal Annual Grassland Alliance | NatureServe Biotics 2019
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Name: Avena fatua - Bromus spp. Ruderal Annual Grassland Alliance
Reference: NatureServe Biotics 2019
Description: This alliance of non-native annual grasslands and forblands is composed of cool-season, annual grasses mostly introduced from Europe. They are invasive in disturbed areas throughout much of California. The composition varies widely. Many alien annual species may be present, including <i>Aegilops triuncialis, Aira caryophyllea, Avena barbata, Avena fatua, Brachypodium distachyon, Brassica</i> spp., <i>Bromus diandrus, Bromus hordeaceus, Bromus madritensis, Centaurea melitensis, Centaurea solstitialis</i>, and <i>Cynosurus echinatus</i>. The composition of this alliance is largely determined by amount of disturbance coupled with fall temperatures and precipitation, light intensity, litter thickness and microtopography. The percentage of exotic alien species is often directly related to disturbance history with heavy disturbance correlating with heavy exotic invasion. Annual grasses are supremely adapted to the Mediterranean climate of California; many species evolved under similar conditions in southern Europe and northern Africa. Plants germinate during winter rains, and complete their life cycles by the beginning of the summer drought. Seeds often remain viable for many years. 
Accession Code: urn:lsid:vegbank.org:commConcept:39080-{EE89CE48-CFEC-40F6-9EA2-5F673E9F8EB5}
Plot-observations of this Community Concept: 22
      Party Perspective according to: NatureServe (organization)
Perspective from: 18-Dec-2014 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.899921 NatureServe ExplorerNatureServe Explorer logo
  Code: A3870
  Translated: Wild Oat - Brome species Ruderal Annual Grassland Alliance
  Common: Californian Ruderal Annual Grassland
  Scientific: Avena fatua - Bromus spp. Ruderal Annual Grassland Alliance
(convergence) and Synonyms:
(similar) Avena fatua - Bromus spp. Ruderal Annual Grassland Alliance