Morphology
A. vesiculosa is a rootless aquatic plant; seedlings develop a short protoroot, however this fails to develop further and senesces. The plant consists of floating stems reaching a length of 6–40 cm. The 2–3 mm trap leaves grow in whorls of 5-9 in close succession along the plant's central stem. The actual traps are held by petioles which hold air sacks that aid in flotation. One end of the stem continually grows while the other end dies off. Growth is quite rapid (4–9 mm/day in Japanese populations ), so that in optimal conditions a new whorl is produced once or more each day.
Read more about this topic: Aldrovanda Vesiculosa
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