Juncus is a member of the rush family. This variety is known as the corkscrew rush. It is cool season, clump forming , and loves lots of moisture! There is a large specimen at Thompson Rivers University in Kamloops.
Variety:
Juncus effusus 'Spiralis' leaves are dark green, round, spiralling up and out from the crown, to 18" tall flowers are brown, forming part way along the stem zone 4 requires moist soil, good along waters' edge also does very well in a pot partly submersed in a pond (do not let the crown be under water!)