Potamogeton zosteriformis
Encyclopedia
Potamogeton zosteriformis is a species of aquatic plant
Aquatic plant
Aquatic plants are plants that have adapted to living in aquatic environments. They are also referred to as hydrophytes or aquatic macrophytes. These plants require special adaptations for living submerged in water, or at the water's surface. Aquatic plants can only grow in water or in soil that is...

 known by the common names flatstem pondweed and eel-grass pondweed. It is native to much of northern North America, including most of Canada and the northern United States. It grows in water bodies such as ponds, lakes, and slow-moving streams. This plant produces a very narrow, flattened, winged stem up to a roughly a meter in maximum length. The rigid, light green leaves are linear in shape, up to 20 centimeters long but less than 1 wide. The inflorescence
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. Strictly, it is the part of the shoot of seed plants where flowers are formed and which is accordingly modified...

 is a spike of flowers arising from the water surface on a peduncle
Peduncle (botany)
In botany, a peduncle is a stem supporting an inflorescence, or after fecundation, an infructescence.The peduncle is a stem, usually green and without leaves, though sometimes colored or supporting small leaves...

 a few centimeters long. The plant often produces turions, a specialized bud that may resprout after a dormant winter.

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