- Azolla pinnata is a small fern with a triangular frond that measures up to 1 in. (2.5 cm) in length and floats on the water.
- The frond is made up of many rounded or angular overlapping leaves each 0.08 in. (0.2 cm.) long. They are green, blue-green, or dark red in color and coated in tiny hairs, giving them a velvety appearance. The hairs make the top surface of the leaf water-repellent, allowing the plant to float.
- Ferns do not produce a flower.
- The small fruit is a capsule that can contain up to 64 small spores.
- Ecological Threat
- Azolla pinnata can quickly spread to cover open areas of water. It forms dense surface mats that impede water flow and navigation, and clog irrigation pumps. Mats of Azolla pinnata also reduce oxygen levels and the amount of light available to other aquatic organisms. It can be found in lakes, slow moving rivers and streams, ponds and wetlands.
Image Sets View other image sets:
EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org
State Invasive List - This map identifies those states that list this species on their invasive species list. For more information, visit Invasive.org
Invasive Listing Sources
|Common Name Reference:|| Weed Science Society of America Common Names List|
|Scientific Name Reference:||USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|