no THE STORY OF PLANT LIFE 



who says, " because the seede is lyke mustard seede 

 in colour and in tast, and the vessel that coteyneth 

 the seede is lyke a disshe." 



Thlaspi arvense. — In Fig. i6 the leaves below 

 the raceme and the rotmd large pods are figured. Here, 

 as in the case of the Treacle Mustard, the uppermost 

 flowers open last. 



Sea Rocket (Cakile maritima). 



Not an inconsiderable proportion of the Cruciferae 

 are maritime plants, as the one under notice, viz. 

 Sea Cabbage, Isle of Man Cabbage, Jersey Cabbage, 

 Hoary Brassica or Mustard, Small Alyssum, Sweet 

 Alyssum, the Scurvy Grasses, Dittander, Woad, Sea 

 Kale, Sea Radish. 



Most of the maritime plants are fleshy and succu- 

 lent, as an adaptation to the dry conditions, caused, 

 not by drought in the ordinary sense, but by the 

 unsuitable character of the soil water, so much so 

 that the amount given off would exceed that absorbed, 

 and so lead to wilting or flagging, were maritime 

 plants not equipped with adaptations to resist such 

 physiological drought as this is called. Physical 

 drought is due to lack of water, as in the case of 

 sandy or shallow soils. 



Sea Rocket is found on most sandy sea-coasts in 

 all parts of the British Isles up to Shetland, and in 

 the Channel Islands. It also occurs on shingle. It 

 may be found also in the sand dune formation, 



