Tsuga chinensisvar. formosana, first described in 1954 by (Hayata) H. L. Li & H. Keng is commonly known as 台湾铁杉 (tai wan tie shan) in the Chinese language. Synonyms include Tsuga formosana Hayata (1908) and T. chinensis var. daibuensis S. S. Ying.
Aljos Farjon, a conifer expert from the Royal Botanic Gardens at Kew, considers this variety identical with the type, but according to Raven and Wu, there are subtle differences in the seed scales. In T. c. var. chinensis, seed scales are are pentagonal-ovate, subsquare, or suborbicular, while in var. formosana they are compressed orbicular to nearly semiorbicular. Otherwise, they varieties are identical.
Distribution. This variety is native to China — exclusive to the island of Taiwan, growing in the mountains at elevations of (2,000 - 3,500 m) above sea level.
Attribution from: Flora of China website, eFloras.org
Tsuga chinensis var. formosana in Taiwan, Tataka, ca.2700m
Photo by asianflora.com
Tsuga chinensis var. formosana — foliage and seed cone detail.
Photo by mingiweng, via Flickriver.com