Juncus uncialis is a species of rush known by the common names twelfth rush and inch-high rush. It is native to the western United States, where it is known from wet habitat such as vernal pools. This is a petite annual herb forming dense clumps of hair-thin green stems no more than 3 or 4 centimeters high. The inflorescence is made up of a single tiny flower atop each stem. The flower has several reddish segments about 2 to 5 millimeters long wrapped around the developing fruit.
| Attributes | Values |
|---|---|
| rdfs:comment |
|
| binomial authority | |
| class | |
| division | |
| family | |
| genus | |
| kingdom | |
| order (taxonomy) |