178 Inheritance in the Stock (Matthiola incana) 



EXPLANATION OF PLATES VII AND VIII. 



Fig. 1. Siliqua from a fully hoary (left), a partially hoary (centre) and a glabrous type 



(right). 

 Fig. 2. Unopened bud of single flower from a fully hoary plant showing a few scattered 



hairs on the outer surface of the petals. (Well seen in the region indicated by 



the arrow.) 

 Fig. 3. Open single flower of a fully hoary plant seen from the back with hairs scattered 



here and there on the under surface of the petals. (Seen most clearly on either side 



of the midrib in. the lower right-hand petal — indicated by arrow.) 

 Fig. 4. Portion of double flower of a fully hoary plant seen from the back. One patch of 



scattered hairs is to be seen on the median petal (indicated by arrow), near the base, 



and another towards the free border. Smaller patches occur on several other petals. 

 Fig. 5. Leaf base and pod from the sub-glabrous grade (a). A few solitary hairs occur 



on the leaf margin and here and there in the middle region of the pod. 

 Fig. 6. Upper stem internode, slightly hairy, from the sub-glabrous grade (c). 

 Figs. 7, 8. Leaves of the sub-glabrous grade (c) hairless except for the hydathode 



trichomes. 

 Fig. 9. Characteristic pods from the same with cpnspicuous hairs on the stigmatic horns 



and sutures. 



Fig. 10. Leaf from a mosaic plant showing the markedly unequal development of the 

 hoary (left) and glabrous (right) halves. 



Fig. 11. Two leaves from the same showing small irregular hairy patches. Where such a 

 patch involves the actual margin the limit of the patch is often defined by an irregu- 

 larity in the contour line. 



