Frogbit and duckweed are both floating aquatic plants which both inhabit still and slow moving bodies of freshwater. They are also both widely used as ornamental plants in aquariums and ponds. Both plants have an incredibly similar appearance and are often described as looking like small water lilies. However, they are actually very different and are not even closely related. So join us as we discover everything you need to know about frogbit vs duckweed!
Comparing Duckweed vs Frogbit
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The 4 Key Differences Between Frogbit and Duckweed
The main differences between frogbit and duckweed are the shape and size of their leaves. Frogbit is larger than duckweed and has heart-shaped leaves. However, duckweed has a completely different structure than frogbit. The other differences between them include the color of their flowers and how fast they grow.
Frogbit vs Duckweed: Classification
The first difference between frogbit and duckweed is how they are classified. Despite appearances, they are not actually closely related. Duckweed is the common name for a species in the Lemnoideae subfamily, of which there are approximately 35 species across four genera. Lemnoideae is a subfamily of the Araceae family group which is known as the arum family or the aroids. Although many of the duckweeds are native to the Americas, there are a few species which are native to Africa, Asia, Australia, and parts of Europe.
Frogbit is the common name given to several species of plant within the Hydrocharitaceae family group. The species which are known as frogbit include three in the Hydrocharis genus – H. chevalieri, H. dubia, and H.morsus-ranae – and one in the Limnobium genus – L. spongia (American frogbit). The most common species is the common frogbit (Hycharis morsus-ranae). The frogbits are native to Africa, Asia, Europe, and the Americas.
Frogbit vs Duckweed: Leaves
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One of the main differences between these two plants is the shape of their leaves. Frogbit often looks like small water lilies as it develops heart-shaped leaves which float on of just underneath the surface of the water. Each individual leaf can be 0.5 to 2.5 inches wide and they are usually a glossy green color, although their underside can sometimes be a little brown.
Duckweed is smaller than frogbit, being only 0.04 to 0.6 inches wide. At first glance duckweeds simply look like small, round-shaped leaves floating around on the water. However, they are not even really leaves at all. Instead, they have a simple structure and consist of a “leaf-like body” with a single root hanging below. This simple structure is typically described as a “thallus” or a “frond”. This small structure often has air pockets which help it to float in the water.
Frogbit vs Duckweed: Root
As we’ve just mentioned, duckweeds are a single, simple structure with a single root hanging below the body of the plant. The root of the duckweed plant is small just like the plant itself. Each frond has a single root hanging just below it in the water. The roots are thin and usually short (although the length depends on the species), and they don’t develop any branches or hairs on them.
Unlike duckweed, frogbit develop roots which are covered in very fine hairs. In many cases the hairs are so fine they are almost impossible to see. The roots of frogbit are usually much longer than those of duckweed and although it again depends on the individual species, in some cases they can reach 20 inches long.
Frogbit vs Duckweed: Flowers
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The most noticeable difference between frogbit and duckweed is their flowers. Frogbit is undoubtedly the more visually appealing of the two plants as it develops small white flowers. The flowers have a yellow center and consist of three small white petals. Frogbit flowers in mid to late summer, typically during the months of July and August.
Although duckweed is classed as a flowering plant, it does not always flower in the typical sense due to its simple structure. If it does flower at all then the flowers are tiny and green – making it one of the smallest flowering plants around.
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