The name P. incisa was published first but the name was used prior by Lamarck in 1779. The next validly published names for this species, P. blinii and P. florida were published in the same year (1915) but P. blinii was published earlier in that year (Jan-Mar versus April). P. blinii, P. souliei and P. rupicola are closely related but distinguishable by the leaves. The illustration in the Flora of China is helpful in this regard. P. blinii has leaves ovate to oblong, with a distinct petiole, farinose underneath (sometimes efarinose), short, rough hairs above, rounded apex, and an incised-dentate to pinnatifid margin. Flowers are purple in umbels of 2-8 and the calyx is campanulate and five ribbed.P. longipinnatifida Chen is listed as a synonym of P. blinii. Though this species looks distinct, it seems to be an extreme variation which I once thought should be separate. At present I am keeping it under P. blinii (see last 4 images below). See blog post "Primula longipinnatifida"