The outer petals of a rose, especially those that are larger than and also enclose the inner petals. If you are looking up names of plants, check the Horti Plex plant database here at GardenWeb. Proper nouns are generally not included in the glossary.
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You can browse the glossary, but there are many pages. With this setting, epiphyt will match both epiphyte and epiphytic. You can also limit your search to just terms or just definition. If there is still no match, all non-word characters are stripped. This glossary was compiled by the editors of GardenWeb from a variety of sources.