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.
A large perennial grass, native to South America, pampas grass grows in large clumps eight to ten feet high. In the summer it can bear silvery-white or pinkish silken plumes that grow up to 12 feet high. Some have purple flowers and still others are smaller plants that grow four to five feet tall.The variety Cortaderia selloana 'pumula' is a dwarf form with very narrow grass-like leaves. large perennial grass, native to South America, pampas grass grows in large clumps eight to ten feet high. In the summer it can bear silvery-white or pinkish silken plumes that grow up to 12 feet high. Some have purple flowers and still others are smaller plants that grow four to five feet tall.