Ranunculoid

An Epicycloid with $n=5$ cusps, named after the buttercup genus Ranunculus (Madachy 1979).

See also Epicycloid

References

Madachy, J. S. Madachy's Mathematical Recreations. New York: Dover, p. 223, 1979.

Pickover, C. A. Keys to Infinity. New York: Wiley, pp. 79-80, 1995.