Fig. 1.

Illustration of a hypothetical 3D Euclidean flower morphospace. Each dimension is a variable describing a quantitative aspect of floral morphology (petal width, petal length, degree of petal union), and each point in this space is the position of a hypothetical flower in morphospace. Three of these flowers (black dots) are represented as sketches to illustrate that any displacement in this space that is not parallel to any of the axes can be directly interpreted as a simultaneous change in petal size and union.