Aponogeton longiplumulosus is a submerged aquatic plant that is native to Madagascar. It possesses an elongated rhizome 2–3 cm in diameter. The leaves are an olive green-brown, 8 - 14 inches long and 2.5 inches broad, with a fluted margin and a petiole up to about 24 inches long. No floating leaves are formed. New leaf colour forms have been introduced recently. The flowers are a dark violet in colour.