Forty-two species of Geranium from Yunnan, Sichuan, Gansu, W Hubei and adjacent territories are keyed and described. Four new species are published: G. canopurpureum Yeo, G. duclouxii Yeo, G. fargesii Yeo and G. retectun Yeo. One previously described species is reduced to varietal rank (as G. hupehanum var. wilsonii (Knuth) Yeo) and many others are reduced to synonymy. The name G. platyanthum Duthie is taken up for G. eriostemon Fischer ex DC, which is a later homonym of G. eriostemum Poiret. A catalogue of collectors' numbers is supplied.