We attempted to distinguish western wheatgrass
(Agropyron smithii) from thick-spike wheatgrass (Agropyron dasystachyum), but the two species can be very similar morphologically (Lavin, 2012), and we may have erred occasionally.
* Increase density and distribution of cool-season grasses, such as western wheatgrass
and needle-and-thread, and shrubs, such as fourwing saltbush and winterfat, to ensure that pastures have a variety of plants.
This list also includes Buffalo grass and Western wheatgrass
, both capable of absorbing hydrocarbons from the land.
The site consisted of mixed grass prairie, with Western Wheatgrass
(Pascopyrum smithii) initially comprising over 90% of vegetation (Branson 2008, Branson and Haferkamp 2014).
Cool-season grasses are limited to Texas bluegrass (Poa arachnifera), western wheatgrass
(Pascopyrum smithii), and annual grasses such as sixweeks fescue (Vulpia octoflora) and nonnative annual brome species (Bromus species).
Individual stands tended to be small (< 3 ha) and surrounded by typical western Great Plains short grass dominated by blue grama (Bouteloua gracilis [Lag.]) and western wheatgrass
(Agropyron smithii [Rybd.]).
For example, at Burneyville stands of all entries except Barton western wheatgrass
were nearly or completely eliminated within 26 mo of planting (Tables 3 and 4).
Among the dominant species noted in a small study area are Kentucky Bluegrass (Poa pratensis), Western Wheatgrass
(Agropyron smithii), Green Muhly (Muhlenbergia racemosa), Plains Muhly (M.
inrermedium Beauv.) or western wheatgrass
(Pascopyrum smithii (Rybd) Love), yields more and is more digestible than western wheatgrass
, but has a similar digestibility and is lower yielding than intermediate wheatgrass (Frank and Karn 1988).
"We don't just want to discourage the bad weeds; we also want to promote the good grasses, such as western wheatgrass
, needleandthread, and other native perennial grasses," Vermeire says.
Common grasses were western wheatgrass
(Pascopyron smithii) and bluegrama (Bouteloua gracilis) with scattered patches of shrub live oak (Quercus turbinella), Utah juniper (Juniperus osteosperma), and pinyon pine.
Seeds of four grass species common to both study sites, Schizachyrium scoparium (little bluestem; weighing 1.4 g per 1000 seeds fresh mass), Panicum virgatum (switchgrass; 1.1 g per 1000 seeds fresh mass), Sorghastrum nutans (indiangrass; 1.9 g per 1000 seeds fresh mass) and Pascopyron smithii (western wheatgrass
; 2.89 g per 1000 seeds fresh mass) were purchased locally (Johnston's Feed-store of Enid, Oklahoma) in Feb.