Japanese large-flowered variety, tepals purplish blue with red middle bar. Anthers yellow. The cultivar name is that of a river (Hokkaidoo).

Group: Early large-flowered group
Pruning: Light prune (Group 2)
Raised by: Masako Takeuchi
Country of origin: Japan
Date raised: 1992
Parentage: Mrs.N.THompson' x 'Barbara Jackman'
Other name(s): None known

Further detail:

Flower diameter: 10-12cm