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Patagonian Semi-Desert Scrub Macrogroup | NatureServe Biotics 2019
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Name: Patagonian Semi-Desert Scrub Macrogroup
Reference: NatureServe Biotics 2019
Description: This macrogroup represents the xeromorphic scrubs of the southern portion of the Monte biogeographic region, transitional to the Patagonia steppes. It is dominated by the shrub <i>Larrea tridentata (= Larrea divaricata)</i>, forming open scrubs which cover extensive plateaus between the Colorado and Negro rivers in Argentina, where it is associated with <i>Chuquiraga hystrix ssp. erinacea</i> and <i>Baccharis darwinii</i>. Towards the west at around 1000 m elevation, the associated species are <i>Retanilla patagonica</i> and <i>Maihuenia patagonica</i>, in a topography of steep slopes and with very xeric conditions. In the plains or depressions, with a shallow water table and halophilous conditions, <i>Larrea</i> is replaced by <i>Geoffroea decorticans</i> which forms large, dense, monodominant stands up to 2-2.5 m high. Also in topographic depressions with higher soil moisture but no salinity, associated species are <i>Baccharis pingraea</i> and <i>Melica bonariensis</i>. South of the Negro River, steppes dominated by <i>Larrea tridentata (= Larrea divaricata)</i> continue, but they occur in cooler climatic conditions and on sandy soils with other characteristics. In these conditions, the accompanying species are <i>Larrea ameghinoi, Tetraglochin caespitosus</i>, and <i>Perezia recurvata</i>, among others. 
Accession Code: urn:lsid:vegbank.org:commConcept:41018-{AD947C36-8E4B-49C0-A7D5-8E548356D323}
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 17-Apr-2014 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.885147 NatureServe ExplorerNatureServe Explorer logo
  Code: M790
  Scientific: Patagonian Semi-Desert Scrub Macrogroup