part_of part of part of corolla collective phyllome structure keel 2011-09-15T02:09:23Z A boat-shaped collective phyllome structure (PO:0025023) that consists of the two lowest petals (PO:0009032) of a papilionaceous corolla (PO:0009059). PO:0025327 The two petals of the keel are often fused at the apex and free at the base. The keel projects toward the front of the flower. Found in the flowers of some Fabaceae. plant_anatomy quilla (Spanish, exact) rwalls 竜骨（イネ科）、舟弁（マメ科） (Japanese, exact)