1. A central dorsal ridge, like the keel of a boat. 2. The two anterior united petals of a papilionaceous flower.
GardenWeb Glossary of Botanical Terms
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There are three types of irregular flowers:
Papilionaceous (Peas or beans) - five petals of three distinct types. Lathyrus odoratus (sweet pea) and Lupinus spp. (lupine) are examples. The three types of petals are: ...
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