Sparganium Americanum and Sparganium Eurycarpum are two species of bur-reed that can be found in wetland areas. While they may look similar at first glance, there are several key differences that set them apart.
One noticeable difference is in the size and height of the plants. Sparganium Eurycarpum, also known as giant bur-reed, has thicker and taller stems, reaching up to 2.5 meters in height. In contrast, Sparganium Americanum has smaller and thinner stems that typically grow to about 1 meter in height. This difference in size can have an impact on the overall appearance and presence of these plants in a garden or landscape.
Another distinguishing feature is the shape and structure of the leaves. Sparganium Eurycarpum has strongly keeled leaves, meaning they have a distinct ridge or keel running along the center of the leaf. This gives the leaves a more pronounced V-shape when viewed from the side. On the other hand, Sparganium Americanum has leaves that are less keeled and have a more rounded or flat shape.
The flowering heads of these two species also show some variation. Sparganium Eurycarpum has larger flowering heads, measuring around 3 to 4 centimeters in diameter. These heads are composed of multiple small flowers, each with two stigmas. In comparison, Sparganium Americanum has smaller flowering heads, typically measuring around 2 to 3 centimeters in diameter. The flowers of Sparganium Americanum also have only one stigma per flower.
When it comes to the fruiting structures, the achenes of these two species differ in size and shape. Sparganium Eurycarpum produces larger achenes, ranging from 6 to 10 millimeters in length. These achenes are wedge-shaped, broader near the tip and tapering towards the base. In contrast, Sparganium Americanum produces smaller achenes that are more elongated and cylindrical in shape.
In terms of habitat preference, both species can be found in wetland areas such as marshes, ponds, and streams. However, they may have slightly different ecological requirements and tolerances to specific environmental conditions. It is important to consider these factors when selecting the appropriate species for a particular wetland or garden setting.
Sparganium Eurycarpum and Sparganium Americanum can be differentiated by their size, stem thickness, leaf shape, flower size, number of stigmas per flower, and achene characteristics. These differences contribute to their distinct appearance and growth habits. Understanding these variations can help in choosing the right species for specific landscaping or gardening purposes.
