Magnolia denudata, known as the Yulan magnolia (simplified Chinese: ド?; traditional Chinese: ド孽; pinyin: y?l?nhu?; literally: 'jade orchid/lily'), is native to central and eastern China. It has been cultivated in Chinese Buddhist temple gardens since 600 CE. Its flowers were regarded as a symbol of purity in the Tang Dynasty and it was planted in the grounds of the Emperor's palace. It is the official city flower of Shanghai. Magnolia denudata is a rather low, rounded, thickly branched, and coarse-textured tree to 30 feet (9.1 m) tall. The leaves are ovate, bright green, 15 cm long and 8 cm wide. Bark is a coarse dark gray. The 1016 cm white flowers that emerge from early to late spring, while beautiful and thick with a citrus-lemon fragrance, are prone to browning if subjected to frost.