The pinyin name of Lapsang Souchong is Zheng Shan Xiao Zhong and the pronunciation in Cantonese is Cheeng Shaan Siu Jung (quote from Jim). It is a very famous red tea from the Wuyi Mountain, Fujian province. The meaning of Zheng Shan Xiao Zhong is "small species of the exact mountain (Wuyi Mountain)" and it is produced in Tong Mu Guan (tung wood pass) area, Xing Cun (star village), Song An County, so it is also called "Tong Mu Guan Xiao Zhong" or "Xing Cun Xiao Zhong".
For all the other xiao zhong red tea that is produced outside the Wuyi Mountain (such as Zheng He, Tan Yang, Bei Ling, or the Qian Shan from the Jiang Xi province), they are called "Wai Shan Xiao Zhong (small species from the exterior of the mountain)" or "Ren Gong Xiao Zhong (man-made small species)". These red teas copy the processing method of the Zheng Shan Xiao Zhong but have less character than the Zheng Shan Xiao Zhong.
And there are some very low quality so-call Zheng Shan Xiao Zhong that are made from low grade Gong Fu Red Tea. They undergo a fumed and scented processing, like the one that Kuri mentioned [quote: It has a smoky taste. Now, it's often flavored]. This type of red tea is called "Yan Xiao Zhong (smoky small species)" or "Jia Xiao Zhong (fake small species)".
A high quality Lapsang Souchong should hold a full and tight appearance with shiny and dark color. The liquor of this tea has a rich dark orange-red color. The fragrance is high combined with an obvious smoky pine wood smell (the last baked processing use and only use pine wood), and the taste is mellow, thick with a strong dry longan fruit flavor. And it is said that the Zheng Shan Xiao Zhong is the only red tea can still hold a full character when it is aged.
Jing