Glossary of Plant Systematics (1st ed.) by Simpson (2006)
- (a) With two whorls of parts. (cycly) (b) Perianth parts in two distinct whorls. (perianth cycly) (c) Having two whorls or cycles of stamens (stamen cycly) Syn (a-c): dicyclic. (d) Rays in wood that are made up of two vertical rows of cells.