A collective organ part structure (PO:0025269) that is a slender, hollow extension of a corolla and has as parts segments of two more fused petals.
Source:ISBN:9781842464229
Comment
Often contains nectar. Use this term if the spur is part of two or more fused petals (PO:0009032). If the spur is part of a single petal, use petal spur (PO:0025511).
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