Also named as brasenia peltata tursh, the water shield belongs to nymphaeaceae renascent perennial root herb. Xianghu Lake water shield is a top one of the kind and is second to none in southern China no matter for the quality, planting history or reputation. When the Southern Song Dynasty capitalized in Lin’an, Xianghu Lake water shield served as a tribute for the royal court. In the 1920’s, the water shield was exported to Japan and presently, it is sold to Japan, US, Hong Kong and Taiwan etc.