This plant propagates on moist soil and is cultivated at Kagoshima prefecture and elsewhere.  It is called Wengcai as a Chinese vegetable.   
Flowers white.  Photo of greenhouse-cultivated plant taken 1975.10.15.   
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1 x 1 (thumbnail images) : For indexing 2 x 2, 4 x 4, 8 x 8 : For viewing on monitor 8 x 8, 16 x 16 : For printing