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Concavo-convex is an adjective that describes the shape of an object which is concave on one side and convex on the other with the concavity being greater than the convexity. It has been used to describe the shape of Yucca and Nolina leaves. It also describes the Longspike Tridens (Tridens strictus) fruit which is a grain and bluets, star violet (Hedyotis) seeds.