Macadamias are large, spreading evergreen trees reaching 30 to 40 ft. high and almost as wide. The bark is rough, brown and dark red when cut. The two species are fairly easily distinguished by their foliage. The leaves of M. integrifolia are 8 to 11 inches in length and occur usually in whorls of 3. The spiny, often sessile leaves of M. tetraphylla usually appear in whorls of 4 and may grow to 20 inches long. The new growth is bronzy pink. . M. integrifolia has creamy white flowers borne in clusters 6 to 12 inches long, while the flowers of M. tetraphylla are cream-colored or pink and borne in clusters up to 15 inches long. Macadamia nuts have a very hard seed coat enclosed in a green husk that splits open as the nut matures. The husk holds a creamy white kernel containing 65% - 80% oil and 4% - 8% sugar. When roasted it develops a uniform color and texture.