mustard plant japanese mustard plant Brassica rapa L. subsp. nipposinica (L.H.Bailey) Hanelt Brassica rapa subsp. nipposinica Brassica rapa subsp. nipposinica (L. H. Bailey) Hanelt Japanese mustard greens Mizuna Mizuna (Japanese: 'water greens'), also called Xiu Cai, Kyona, Japanese Mustard, Potherb Mustard, Japanese Greens, California Peppergrass, Spider Mustard, etc., is a Japanese name used primarily for cultivated varieties of *Brassica rapa nipposinica* but also for *Brassica juncea* var. *japonica*. PLANTS:BRRA brassica juncea var. japonica brassica rapa nipposinica california peppergrass kyona potherb mustatd spider mustard water greens xiu cai