Check this out, I was able to find some newer genomic research that is saying the Yunnan strains are the origin of cannabis sativa:
Genetic origins of Cannabis Sativa.pdf (474.9 KB)
https://www.researchgate.net/publication/357405767_The_origin_of_the_genus_Cannabis
And also this interesting reference from an Etienne De Mejier paper from back a few decades:
“References on Chinese fibre strains are hardly available, indicating that landraces are still primarily cultivated. At the beginning of the 20th century Chinese landraces were used to select the now extinct Kentucky hemp cultivars that were cultivated until the mid-1950s in the United States. The first improved selection from Chinese origin was called ‘Minnesota No. 8’ (Dewey, 1913). Dewey (1927) gives the ancestries of the later developed Kentucky cultivars: ‘Kymington’ was selected from the progeny of a free-pollinated single female plant of ‘Minnesota No. 8’. ‘Chington’ was obtained by successive individual selection in the progeny of a single female plant from a different introduction from China. ‘Arlington’ was selected from the progeny of the crossing (‘Kymington’ x ‘Chington’). ‘Ferramington’ was selected from the progeny of a cross between the Northern Italian landrace ‘Ferrara’ and ‘Kymington’. A Chinese strain is presently used in Hungary as a heterosis breeding parent which is relatively unrelated to the crossing partners of European origin (Bócsa 1954).“