in the Stock (Afattbiota incanct). 
459 
Fig. 12-19. Matthiola incana. 12. A straight 4-valved siliqua slightly asymmetrical with four 
orthogonal valves and four diagonal commissures. 13, 14. Two coiled 4-valved fruits; the lateral 
valve on the one (concave) side imperfectly developed with ruptured edges, hence the spiral form of 
the siliqua. 15. A small 4-valved siliqua with four orthogonal valves, of which the two median 
show rupture of the tissues, one being torn completely across. 16. Apex of the same, showing the 
stigmatic area formed by three of the valves; the fourth valve ends a little below without forming a 
stigma. 17. (Semi-diagrammatic.) Apex of a symmetrical 4-valved siliqua, showing the four 
sutural knobs, the outline of the two lateral valves right and left, the central cavity, and the 
stigmatic surfaces forming a double figure of 8. 18. Transverse section of a young 4-valved 
siliqua, showing the formation of two septa by the four diagonal solid carpels. 19. Transverse 
section of a siliqua composed of four valves and three commissures. 
