Figure 1.

Diagrammatic representation of fruits of focal species. Left panel: Erucaria erucarioides fruit in medial view. Right panel: Cakile lanceolata fruit in medial view. Central panel, top: transverse section through the distal segments of Erucaria and Cakile. Central panel, bottom: transverse sections through proximal segment of Erucaria (left) and Cakile (right). White arrowheads in left and right panels indicate the position of the joint, black arrowheads in the central panel indicate the position of the valve margin, dotted lines represent abscission zones at fruit maturation. o, ovules; ow, ovary walls; r, replum; s, septum; v, valves; *, endocarp b layer.