22 INTBODTJCTION. 



from common ; the others grow nowhere else in 

 Great Britain. T. Bocconi, and T. Molinerii were 

 first observed about ten years ago ; the former may 

 be distinguished by its terminal heads of flowers, 

 which always grow in pairs ; it occurs also on a 

 hedge near Cadgwith, and on a rocky mound be- 

 tween that place and Poltesco. T. Molinerii occurs 

 at intervals between this spot and Cadgwith flag- 

 staff"; it is easily detected by its large star-like 

 heads of downy flowers, which, as the seeds begin 

 to ripen, assume a remarkably whitish hue. T. 

 strictwn I had the good fortune to discover in July, 

 1847, here and near the Old Lizard Head. It is 

 strongly marked by its erect habit, long serrated 

 leaflets, and globular rigid heads of flowers. It 

 was previously known as a native of Jersey, but 

 had not been noticed in Great Britain. The fact 

 that three species of Trefoil peculiar to the district, 

 should have been discovered growing together, has 

 been thought so singular, that some botanists have 

 entertained doubts whether they are really indi- 

 genous. I myself see no reason to doubt that their 

 first introduction to the Lizard district was coeval 

 with that of the rest of the vegetation on the cliffs. 

 It should be remembered that, as the Lizard is the 

 most southerly point of England, and its climate 

 uniformly mild, we have good grounds for expect- 

 ing to find plants properly belonging to the warmer 

 sea-coasts of Europe, and such is the case with 

 these three trefoils ; they are all found on the 

 coast of the Mediterranean."* On the favoured 

 serpentine of the Lizard, the Cornish Heath (JErica 



* A Week at the Lizard, by the Rev. C. A. JOHNS. 



