Waterleaf

This modest-sized, yellow grass grows up to 1 foot (30.5 cm) tall. The very thin stalks grow in sparse patches that are resistant and they overwhelm an area rapidly.

When mature, the end of the stem eventually transforms into a medium-sized, green puff.

During the late autumn, it produces an average amount of pollen; it can cause severe allergic reactions, and after flowering, it is left with lots of small grains.