in the Stock {Mat thiol a incana). 
461 
Figs. 20-35. Matthiola incana. 20. A curved 3-valved siliqua with one lateral valve on the 
convex side and one of the pair of diagonal valves with ruptured edges on the concave side. 
21. A similar 3-valved fruit seen from the side, showing partial rupture of the edges of the two 
diagonal valves. 22, 23. Very young 3-valved siliqua with the two diagonal valves completely dis¬ 
joined. 22. Seen from the side of the lateral valve. 23. Seen from the opposite side, showing the 
disjunction of the diagonal valves. 24-6. Apex of a 3-valved siliqua with valves disjoined at the 
apex. 24. Seen from above, the dotted lines indicate the positions of the three commissures. 
25, 26. Different views of the same seen from the side. 27. Transverse section of a symmetrical 
fruit with three valves and three commissures. 28. Transverse section of a siliqua with one lateral and 
two diagonal valves which have fused at their mid-ribs and formed a wing (cut away). 29. Transverse 
section of a similar siliqua ; the two diagonal valves after fusing at their mid-ribs have separated again 
for a short distance and then reunite to form a two-winged edge. 30. A 2-valved siliqua, seen from 
the side, with a projecting rib extending the whole length of one commissure and terminating just 
below the sutural knob in a short process. 31. Lower end of the same siliqua seen from the front, 
showing the rib in the centre of the commissure. 32. Upper end of the same, showing the stigmatic 
area ; a second small cavity (stylar canal) has been formed over the projecting rib. 33. Transverse 
section of the same siliqua, showing a triarch outline to the commissure carrying the projecting rib 
and three vascular cords. 34. Lower end of a siliqua, showing the development of a median valve 
3 mm. above the lateral valves. 35. Transverse section of the same, showing the development of a 
small third loculus corresponding to the median valve. (The small vascular bundle in each of the 
front commissures is not shown.) 
H h 
