It is a perenninal inhabiting
its rhizomes crawls sideways and extend runners long, but not
growing to clusters. Stems measure 20-50cm in height, with radical
leaves occasionally extends longer than the stems. The other leaves
are slender and long, and 2-3mm in width. Flower stalks, slim and
tender, bear 2-5spikelets at the tips; perianth lobes are white and
fluffy, grow as long as 2cm long in the flowering time, and become
into one clustes. Bloom time: May-July.