The Black Cottonwood (P. trichocarpa, Hook.) is the giant of the genus, reaching 200 feet in height and 7 to 8 feet in trunk diameter. It is tall and stately, with a broad, rounded crown supported upon heavy upright limbs. One of the beautiful sights of the Yosemite Park is the autumnal gold of black cottonwood groves whose abundant foliage embowers the stream borders at the altitude of about 4,000 to 5,000 feet. The tree's range covers the coast plain and western slopes of mountains from Alaska to southern California. The largest trees are on the lowest levels. The dark rich green of the leaves gives this tree its name. They are ovoid, 3 to 4 inches long, with the finest of sawtoothed margins. The wood has come into extensive use for the manufacture of various woodenwares and for staves of sugar barrels.