Japanese large-flowered variety, tepals light blue. Anthers cream yellow. The cultivar name is name of a river (Ibaraki Pref.).

Group: Early large-flowered group
Pruning: Light prune (Group 2)
Raised by: Fumi Murayama
Country of origin: Japan
Date raised: 1997
Parentage: texensis 'Gravetye Beauty' x free pollination
Other name(s): None known

Further detail:

Flower diameter: 10-12cm