Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Aponogeton undulatus is a species of aquatic plant, sometimes used in aquariums. Some taxonomists consider this should be under the name Apontogenton stachyosporus. It is a submerged aquatic plant with an ovoid rhizome about 2 inches (5 cm) long by 1 inch (2.5 cm) broad. The leaves are a very pale green, 4 to 6 inches (10 to 15 cm) long with an undulating margin on petioles of 6 inches (15 cm) length. Floating leaves are not produced by the true species but some hybrids do produce them. The flowers are produced on a single erect stem with white flowers.

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