The Collaborative International Dictionary
Nelumbo \Ne*lum"bo\, prop. n. [Ceylonese word.] (Bot.) A genus of great water lilies. The North American species is Nelumbo lutea, the Asiatic is the sacred lotus, Nelumbo speciosa. [Written also Nelumbium.]
Yoncopin \Yon"co*pin\, n. [Perhaps corrupted from Illinois micoupena, Chippewa makopin, the American lotus.] (Bot.) A local name in parts of the Mississippi Valley for the American lotus ( Nelumbo lutea).
Wikipedia
Nelumbo lutea is a species of flowering plant in the monotypic family Nelumbonaceae. Common names include American lotus, yellow lotus, water-chinquapin, and volée. It is native to North America. The Linnaean binomial Nelumbo lutea ( Willd.) is the currently recognized name for this species, which has been classified under the former names Nelumbium luteum and Nelumbo pentapetala, among others.