(1967)  Page(s) 51.  Includes photo(s).
 
[From article "Chromosome studies and evolution in Rosa" by G. D. Rowley, Vol. 37, pp. 45-52:]
Cytological study of Boulenger's Rosa nanothamnus ....shows it to be a tetraploid of the canina-type, not a diploid as was previously imagined (fig. 5). Boulenger...cites a distribution range for nanothamnus from Asia Minor to Western China, extending to Sze-Chuan where Rosa chinensis also occurs....
I should like to close by thanking Andrew Roberts for the use of his photographs and unpublished data on Rosa nanothamnus.