[Needlegrasses: The Genus Achnatherum East of the Cascade Mountains of Oregon and Washington]

Thurber's Needlegrass

Achnatherum thurberianum

Synonym: Stipa thurberiana

Thurber's Needlegrass: Achnatherum thurberianum (Synonym: Stipa thurberiana)

Thurber's needlegrass as seen on prehistoric Bretz Flood sand deposits at the southern base of Steamboat Rock, Steamboat Rock State Park.........June 1, 2013.

Hairy awns of Thurber's Needlegrass: Achnatherum thurberianum (Synonym: Stipa thurberiana) - Thurber's Needlegrass: Achnatherum thurberianum (Synonym: Stipa thurberiana)

Thurber's needlegrass as seen on prehistoric Bretz Flood sand deposits at the southern base of Steamboat Rock, Steamboat Rock State Park.........June 1, 2013. Note that the awn hairs are plumose for the first two turns.

Thurber's Needlegrass: Achnatherum thurberianum (Synonym: Stipa thurberiana)

Another close look at the awn hairs of Thurber's needlegrass as seen along the Round Mountain Trail #805 near Scissors Spring, Ochoco National Forest..........August 9, 2014.

Inflorescence of Thurber's Needlegrass: Achnatherum thurberianum (Synonym: Stipa thurberiana) - Inflorescence of Thurber's Needlegrass: Achnatherum thurberianum (Synonym: Stipa thurberiana) - Thurber's Needlegrass: Achnatherum thurberianum (Synonym: Stipa thurberiana)

Close-up images of what may be Thurber's needlegrass as seen at left and at center in open ponderosa pine forest on Missoula Flood sandbars between Five Mile and the Little Spokane River, Spokane County, WA........June 29, 2019. The photo at right shows what may be Thurber's needlegrass as seen at the same location.......July 4, 2018.

Thurber's Needlegrass: Achnatherum thurberianum (Synonym: Stipa thurberiana)

A close-up view of the inflorescence of Thurber's needlegrass as seen along the Rimrock Springs Trail #850, Crooked River National Grasslands..........June 24, 2017.

Paul Slichter