National Council for The Conservation of Plants and Gardens
National Collection of the Genus Codonopsis and Allied Genera
Another twining climber of the Pseudocodonopsis group with large open blue flowers, slightly paler than C.vinciflora, with a dark "eye". Codonopsis forrestii flowers later than both C. vinciflora and C.grey-wilsonii and in some years is the last to flower for us. The leaves are less toothed than C.vinciflora and the calyx lobes fully clasp the bud. C.forrestii can be quite vigorous reaching 2 metres or more and makes a grand spectacle in late summer.
The seed is medium sized and light brown.
Yunnan, Sichuan and possibly Tibet