is a perennial herb growing in clusters in wet places in
mountainous regions, with runners stretching in all directions. The
height is to measure 5-20cm. Leaves are of opposite phyllotaxis,
each 5-20mm in size, oval-shaped, with 3-8 obtuse serrations on the
margins. Bracts are greenish, in the same shape as on-stem leaves.
Flowers are as small as 2mm in diameter, light yellow, sepals
erecting, and stamens numbering 4 in all. Bloom time: April-May.