Saw a plant that looks like the narrow leaved vallis at Fu Wo. Owner say he has the plant for a few months liao and they are just about 1ft tall... Looks rather clean but dunno what plant it is and so dunno its actual height... It's supposed to be a sort of thick hairgrass as there are 'seeds' on the end of emersed leaves.

Had not had the opportunity to take pics of the plant. If I am there again, will as permission to take. In the meantime, anyone had been there, seen this plant and know the ID of the plant?