This illustration shows a Figwort, a member of the genus Scrophularia. It has the characteristic features of a five-lobed calyx, a nearly globose corolla (the upper lip of which is two-lobed and the lower three-lobed), and a capsule opening with two valves, the edges of which are turned in. The illustration also shows 1) a cross section of a flower, and 2) fruit.
John H. Finley ed. Nelson's Perpetual Loose-Leaf Encyclopaedia (vol. 5) (New York, NY: Thomas Nelson and Sons, 1917)