While Proto-Sino-Tibetan is commonly considered to have two direct descendants, Proto-Sinitic and Proto-Tibeto-Burman,[2] in recent years several scholars have argued that this was not well-substantiated,[3] and have taken to calling the group "Trans-Himalayan".[4] In this case, Proto-Tibeto-Burman may be considered as equivalent to Proto-Sino-Tibetan if Sinitic is indeed not the first branch to split from Proto-Sino-Tibetan.[5]
Reconstructed features include prefixes such as the causative s-, the intransitive m-, the miscellaneous b-, d-, g-, and r-, suffixes -s, -t, and -n, and a set of conditioning factors that resulted in the development of tone in most languages of the family.[6] The existence of such elaborate system of inflectional changes in Proto-Sino-Tibetan makes the language distinctive from some of its modern descendants, such as the Sinitic languages, which have mostly or completely become analytic.
Proto-Sino-Tibetan, like Old Chinese, also included numerous consonant clusters, and was not a tonal language.
The reconstruction by Peiros & Starostin suggests a much more complex consonant inventory.[7] The phonemes in brackets are reconstructions that are considered dubious.
The consonants /ptkqʔmnŋlrj/ can take coda position, as well as the cluster /rl/. While Hill does not reconstruct /j/ as an initial consonant due to Baxter and Sagart's Old Chinese reconstruction lacking such a phoneme, he mentions that Jacques and Schuessler suggest a /j/ initial for some Old Chinese words due to potential Tibetan or Rgyalrongic cognates.[10]
Hill also claims that his reconstruction is incomplete, as it does not account for Tibetic palatalization, proto-Burmish preglottalization, Sinitic aspirates, and the Sinitic type A and B distinction of syllables.
In Gong Huangcheng's reconstruction of the Proto-Sino-Tibetan language, the finals *-p, *-t, *-k, *-m, *-n, and *-ŋ in Proto-Sino-Tibetan remained in Proto-Sinitic and Proto-Tibeto-Burman. However, in Old Chinese, the finals *-k and *-ŋ that came after the close vowel *-i- underwent an irregular change of *-k＞*-t and *-ŋ ＞*-n. In Proto-Tibeto-Burman, *-kw and *-ŋw underwent a sound change to become *-k and *-ŋ respectively, while in Old Chinese those finals remained until Middle Chinese, where the finals underwent the same sound change.[11]
Furthermore, in Proto-Tibeto-Burman, the finals *-g, *-gw, and *-d underwent the following changes:
^Orlandi, Georg (2021). "Once again on the history and validity of the Sino-Tibetan bifurcate model". Journal of Language Relationship. 19 (4): 263–292.
^van Driem, George (2007). "The diversity of the Tibeto-Burman language family and the linguistic ancestry of Chinese". Bulletin of Chinese Linguistics. 1 (2): 211–270. doi:10.1163/2405478X-90000023.
^Peiros, Ilia; Starostin, S.A. (1996). A comparative vocabulary of five Sino-Tibetan languages. Parkville, VIC: Univ. of Melbourne, Dept. of Linguistics and Applied Linguistics. ISBN 9780732513504.
^Gong Huangcheng (龔煌城) (2003). 從原始漢藏語到上古漢語以及原始藏緬語的韻母演變 [Final changes from Proto-Sino-Tibetan to Old Chinese and Proto-Tibeto-Burman] (PDF). 古今通塞：漢語的歷史與發展. 第㆔屆國際漢學會議論文集語言組 (in Chinese). pp. 187–223. Archived from the original(PDF) on 2020-11-03. Retrieved 22 October 2023.
Hill, Nathan W. (2019). The Historical Phonology of Tibetan, Burmese, and Chinese. Cambridge: Cambridge University Press. doi:10.1017/9781316550939. ISBN 978-1-316-55093-9.
Italics indicates single languages that are also considered to be separate branches.
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Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction