龙骨瓣（Carina）指蝶形花中下面两片花瓣部分联合（合生）形成龙骨状。如蝶形花科(Papilionaceae)植物的花
...旗瓣(standard)；两侧两枚较小，在旗瓣之内，称翼瓣 (wing)；最下面两枚最小且上部联合并向上弯曲成龙骨状，特称“龙骨瓣 (keel)”。为豆科蝶形花亚科特有的花冠类型。
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一侧有爪，呈龙骨瓣三角状半圆形。
Claw on one side, showing triangular-shaped semi-circular keel.
热带美洲一种多年生藤本植物，有时由于美丽的总状花序的紫色和黄色而栽培，花冠的龙骨瓣盘卷像一个蜗牛的壳。
Perennial tropical American vine cultivated for its racemes of showy yellow and purple flowers having the corolla keel coiled like a snail shell; sometimes placed in genus phaseolus.
结果发现：除了翼瓣和花丝表皮以外，气孔均分布在花朵的其它器官表皮上， 如花萼、旗瓣、龙骨瓣、雌蕊托、子房、花柱和花药。
Photosynthesis of flower organs was also measured. Stomata were on the surface of sepal , vexilla, keel, anther, gynophore, ovary, and style but not wing or filaments.
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