Crinum calamistratum is an aquatic angiosperm native to Cameroon.

[1] It is known by the common names of narrow crinum or African onion plant.

[2] The species was first discovered by botanist H. Gregory from a population near Kumba, Cameroon in 1948, and was described by Josef Bogner and Hermann Heino Heine in 1987.

[3] C. calamistratum is an aquatic plant with distinct, curly leaves and a thick, onion-like bulb.

[3] The species is commonly used as an ornamental plant in freshwater aquascaping.