Black tea is a variety of tea that is more oxidized than the green, oolong and white varieties. All four varieties are made from leaves of Camellia sinensis. Black tea is generally stronger in flavor and contains more caffeine than the less oxidized teas. In Chinese and culturally influenced languages, black tea is known as "crimson tea" (¼t²è, Mandarin Chinese h¨®ngch¨¢; Japanese k¨­cha; Korean hongcha), perhaps a more accurate description of the colour of the liquid. The name black tea, however, could alternatively refer to the colour of the oxidized leaves. In Chinese, "black tea" is a commonly used classification for post-fermented teas, such as Pu-erh tea. However, in the Western world, "red tea" more commonly refers to rooibos, a South African tisane.