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Achnatherum lemmonii Herbaceous Alliance | Western Ecology Working Group of...
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Name: Achnatherum lemmonii Herbaceous Alliance
Reference: Western Ecology Working Group of...
Description: The bunchgrass Achnatherum lemmonii (= Stipa lemmonii) and the moss Racomitrium canescens dominate this alliance, found on hilltop balds along valley margins of the Willamette Valley, Oregon. Cover values are not available, but frequencies in 0.01-square-meter plots show Achnatherum from 15-56% and Racomitrium from 74-100%. Other native bunch grasses include Festuca idahoensis and Koeleria macrantha. Quercus garryana trees are usually found on the margins of this type, but most areas are too shallow-soiled to support much tree or shrub growth. Toxicodendron diversilobum is found under the isolated trees and on the margins of these grasslands. Native forbs from this grass bald include Trifolium microcephalum, Viola douglasii, Lotus micranthus, Allium amplectens, and Eriogonum nudum. Exotic grasses which have invaded most stands include Aira caryophyllea, Bromus hordeaceus (= Bromus mollis), Bromus rigidus, Cynosurus echinatus, Holcus lanatus, and Arrhenatherum elatius. 
Accession Code: VB.CC.21261.ACHNATHERUMLEMM
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 26-Nov-1997 to: 01-May-2019
     
  • status: accepted
  • This Community's Level: Alliance
  • This Community's Children: [none]
Names:   Scientific: Achnatherum lemmonii Herbaceous Alliance
  Translated: Lemmon's Needlegrass Herbaceous Alliance
  UID: HIGHER_CLASS_UNIT.2.124930 NatureServe ExplorerNatureServe Explorer logo
  Code: A.1292