exploration of tropical Africa led to the discovery of Hibiscus schizopetalus and to its introduction into Europe, where it 
and races of H. Rosa-sinensis were crossed. There was discovered^ also, a H, Uliiflorus in Mauritius, which was inter- 
crossed with H. Rosa-sinensis. Moreover, the Hawaiian Islands contain several indigenous species of the genus ; and, 
beginning in 1892, some of these have been crossed, in most cases with success, into the complex arising from the 
earlier crossings of H. Rosa-sinensis. The result has been the raising of garden plants of great beauty, with flowers 
of a wide range of colours and of increased size. The Hawaiian H. waimese is present in the Gardens' collection. 
There are also present two species which refuse to cross with the others. They are H. mutabilis and H. syriacus. 
H. mutabilis is known in three races ; in one the flowers are white, in the second rose-coloured, and in the third (the 
cause of its Latin name) they open white and fade rose-coloured, H, syriacuS} despite its name, is doubtless of origin 
in northern China or near thereto ; it has bluish flowers, stands the winter in the open air in the south of England, and 
grows badly in Singapore. 
At the top of the ascent is the beautiful Amherstia nobiliSf and opposite is the last remaining tree of an old 
avenue of the weeping cypress, Cupressus funebriSt mentioned on p. g. 
Amherstia nohilis was discovered by botanists in 1826, as a tree cultivated around monasteries in Tenasserim, 
and was brought into the gardens of Europeans in the tropics. It attains 40 ft. in height. It is difficult to 
propagate, and in Singapore is very sparingly fertile. 
Swartzia pinnata, Cassia Fistula^ Cassia muUijugaf Adenanthera pavonina and Peltophorum ferrugineum, of the 
same family, have been planted as near as possible, upon Lawn J. 
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