Siouan languages
Authors who call the entire family "Siouan" distinguish the two branches as "Western Siouan" and "Eastern Siouan" or as "Siouan-proper" and "Catawban". Others restrict the name "Siouan" to the western branch and use the name "Siouan–Catawban" for the entire family. Generally, however, the name "Siouan" is used without distinction.
Saisiyat language
The language area of Saisiyat is small, situated in the northwest of the country between the Hakka Chinese and Atayal regions in the mountains (Wufeng, Hsinchu; Nanchuang and Shitan, Miaoli).
There are two main dialects: Ta'ai (North Saisiyat) and Tungho (South Saisiyat). Ta'ai is spoken in Miao-Li and Tungho is spoken in Hsinchu.
Kulon, an extinct Formosan language, is closely related to Saisiyat but is considered by Taiwanese linguist Paul Jen-kuei Li to be a separate language.