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Achnatherum speciosum Shrub Herbaceous Alliance | Western Ecology Working Group of...
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Name: Achnatherum speciosum Shrub Herbaceous Alliance Reference: Western Ecology Working Group of... Description: This shrub herbaceous alliance of the Mojave Desert grows in very xeric conditions with hot summers and occasional freezes in the winter. This alliance requires well-drained rocky or sandy soils. The alliance was formerly widespread, but overgrazing has decimated stands. Remaining stands occur from 600-1000 m elevation, on flat ridges, lower slopes, valleys, and washes. Stands of this shrub herbaceous alliance of the Mojave Desert are dominated by Achnatherum speciosum (= Stipa speciosa), which is the sole, dominant or important plant in the herbaceous layer. Species composition varies between stands, but Achnatherum speciosum is the unifying species. Other graminoids which may be present include Nassella lepida, Achnatherum hymenoides (= Oryzopsis hymenoides), Nassella cernua, Poa secunda, and Elymus elymoides. Emergent shrubs, such as Hymenoclea salsola or Larrea tridentata, compose 10-25% cover in the shrub layer.  Accession Code: VB.CC.27255.ACHNATHERUMSPEC 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 speciosum Shrub Herbaceous Alliance   Translated: Desert Needlegrass Shrub Herbaceous Alliance   UID: HIGHER_CLASS_UNIT.2.126002 NatureServe Explorer   Code: A.1549