Juncus effusus var. effusus
Juncus effusus var. solutus
Additional species:
Juncus acuminatus (Taper-tip rush)
Juncus diffusissimus (Slimpod rush)

Family:
Juncaceae
Lifecycle:
Perennial
Native or Introduced:
Native
Nutrient Removal Rating:
High
Wildlife Value:
High
Invasiveness
Medium
Rooted or Floating:
Rooted
Site Requirements:
Full sun
Maximum Water Depth:
3 inches
Plant Description:
Soft rushes are herbaceous perennials that grow to be 1-4 feet in height. They produce heavily branched rhizomes that aid in formation of large colonies. Culms measure approximately 1/8 inch at sheath tips.
Flowering occurs in summer with fruiting stretching into the late summer and fall. Plants are found in and along the edges of swamps, marshes, and shallow bodies of water. They can also live in any area with frequently moist soils.
The species Juncus effuses is quite complex taxonomically. Many varieties have been recognized within the species. Juncus effusus var. effusus is a shorter variety of the southeastern US while Juncus effusus var. solutus is taller.
Sources:

Juncus diffusissimus (Slim-pod rush) - closeup of infloresence
