EUCAL YPTUS. 77 



from which its name is derived, are still more silvery with 

 the same delicate powdering as that of the young blue gum. 

 Indeed it is far more a harmony in silver-grey than any 

 plant I know. The artichoke, the African honey plant, the 

 Leucodendron argenteum, the Deodar cedar, and the young 

 blue gum are more silvery or blue-grey, but the poly- 

 anthema has the advantage that throughout its silvery foli- 

 age are scattered the delicate flower panicles still more 

 silvery. The Leucodendron argenteum is the most pro- 

 nounced tree of this sort. It is however stiff and hard 

 to raise from seed. 



In seeking for a silver-grey foliage effect the olive 

 should never be forgotten. It is more purely a silver-grey 

 than any tree I know, except the silver Leucodendron. It 

 surpasses this tree on account of its hardiness and the' 

 charming grace of its growth in youth and its character 

 and individuality in age. The olive in California is a 

 handsomer tree than it is in Europe. 



The Himalayan silver cedar has a distinctly green base. 

 It is a beautiful tree. The silvery Eucalyptus that I know, 

 as I go over them in my mind, have their assertive blue or 

 silver coloring, mainly due to a sort of powdery exudation. 

 The base color of their leaves is usually a dull green. 

 Some have that silvery coloring in youth only, as the blue 

 gum, with a persistence in age on the fruit alone, some 

 have it more in age, as variety pallida of sideroxyloii 

 some have it more at one season than at another, as in 

 Eucalyptus polyanthema, and others do not have it at all. 



The drawback to the olive is its proneness to attack by 

 black scale, a parasite that takes its name from the olive. 

 The black scale is ugly in itself and besides exudes a 

 gummy substance that falls on the foliage and branches 



