Scientific name: Lapeirousia laxa (alternatively, Anomayheca laxa （ラペイロウシア）) Common name: False Freesia.
Anomayheca laxa originates from South Africa, and is found in the family of the irises. They grow from bulbs and naturalize easily and look great in a pot or rock garden.
Good info at http://www.plantstogo.com/plantdescriptions/anomathecalaxa.htm and wonderful flash pictures at http://mtntks.cool.ne.jp/haiku1/himehiougi.swf
NATURE IN JAPAN 