aggressive perennial grass with long slender white rhizomes;
rhizome tips are yellowish and sharp-pointed; base of leaf blade
with claw-like appendage that clasps the stem; spikelets, up to 15
cm long, are in 2 long rows borne flatwise to the stem
easily regenerates from very small broken rhizome fragments
making mechanical control difficult
Photo courtesy Dean Swan, Washington State
University (retired)