The Manual on Uniform Traffic Control Devices (MUTCD) is approved by the Federal Highway Administrator. as the National Standard in accordance with Title 23 U.S. Code, Sections 109(d), 114(a), 217, 315, and 402(a), 23 CFR 655, and 49 CFR 1.48(b)(8), 1.48(b)(33), and 1.48(c)(2).
The dominant vegetation types are grassy prairie and grass steppe in which numerous species of the grass genus Stipa are particularly conspicuous. Pampas grass (Cortaderia selloana) is an iconic species of the Pampas. Vegetation typically includes perennial grasses and herbs.
Pampas grass is a nonnative species used in ornamental plantings in Washington and is a known invasive species in California and is escaped in Oregon.Last year, escaped populations of pampas grass were discovered in Washington State, with one infestation having almost 500 plants.ay be confused with: Class C noxious weed jubata grass Cortaderia jubata, is very similary in appearance to pampas grass. Ravenna grass Saccharum ravennae, a Class A noxious weed, is also similar to pampas grass.