''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 pool
Vernal pools, also called vernal ponds or ephemeral pools, are seasonal pools of water that provide habitat for distinctive plants and animals. They are considered to be a distinctive type of wetland usually devoid of fish, and thus allow the safe ...
s. This is a petite annual herb forming dense clumps of hair-thin green stems no more than 3 or 4 centimeters high. The
inflorescence
An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Morphologically, it is the modified part of the shoot of seed plants where flowers are forme ...
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.
External links
Jepson Manual TreatmentPhoto gallery
uncialis
Flora of North America
Plants described in 1890
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