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Arenaria hookeri Rock Alliance | NatureServe Biotics 2019
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Name: Arenaria hookeri Rock Alliance
Reference: NatureServe Biotics 2019
Description: Stands of this alliance have a sparse, short herbaceous layer of mostly perennial, mat-forming cushion plants and a few grasses. These vegetation mats are surrounded by bare ground. These perennials are very drought-tolerant. The diagnostic cushion plant is the perennial forb <i>Arenaria hookeri</i>. Other characteristic plants include <i>Astragalus gilviflorus, Astragalus sericoleucus, Astragalus spatulatus, Comandra umbellata, Ipomopsis spicata, Oenothera flava, Penstemon</i> spp., and <i>Phlox hoodii</i>. The characteristic graminoid is the medium-tall bunchgrass <i>Achnatherum hymenoides</i>. Wet springs bring an abundance of cool-season annuals. Common annuals include <i>Vulpia octoflora</i> and <i>Plantago patagonica</i>. Vegetation in this alliance has been described from the Pawnee National Grasslands in northeastern Colorado at elevations between 1300 and 1935 m. Stands are restricted to hot, dry sites such as exposed siltstone barrens and ravines on convex slopes where erosion is active and moisture penetration is minimal. Soils are shallow with little development, fine-textured and often gravelly. 
Accession Code: urn:lsid:vegbank.org:commConcept:38259-{79C2A685-7BC7-4E6F-A09B-76135721DF7F}
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 08-Jan-2014 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.899159 NatureServe ExplorerNatureServe Explorer logo
  Code: A1642
  Translated: Hooker's Sandwort Rock Alliance
  Common: Hooker's Sandwort Barrens
  Scientific: Arenaria hookeri Rock Alliance
(convergence) and Synonyms:
(similar) A.1642
(similar) Arenaria hookeri Barrens Herbaceous Alliance