This glossary is incomplete; you can help by expanding it: you can also help by adding illustrations that assist an understanding of the terms.
1. in flowering plants, ring of structures that may be united in a tube, arising from the corolla or perianth of a flower and standing between the perianth lobes and the stamens. The trumpet of a daffodil is a corona.
1. an assemblage of two or more cultivars within a species or hybrid.
as a name misapplied by gardeners
1. the upper of two bracts enclosing a grass flower, major contributors to chaff in harvested grain.