142 Alpine Plants. 
The genera Saxifragze and Sempervivum, together 
with the Order Primulacez, should form the preva- 
lent background of the rockery, and be most variously 
represented on it, for in this way the characteristic 
mountain note will be struck ; and this note should 
be emphasised and enriched by an accompanying 
prominence of the Orders Boraginacez and Polemo- 
niacez, of the genera Gentiana and Edrianthus, and 
of the species Anemone vernalis, Dianthus neglectus, 
Dryas octopetala. and Ramondia pyrenaica, care 
being taken in the rest of the Alpines chosen to 
have as varied a selection of Orders represented as 
possible. 
A selection of plants embodying these principles 
and made with great care will be found at the close 
of this essay. 
Bulbs and tubers in quantity are even more indis- 
pensable on the rockery than on the border. The 
value of the Alliums and of the species of Crocus in 
this connection is not sufficiently recognised ; they 
are invaluable for prolonged and successional flower- 
ing. The place where bulbs and tubers are planted 
should be surfaced by carpeting plants to prevent 
bare patches when they die down after flowering. 
So many rockeries have arid tracks and crannies 
where it is difficult to get anything else to grow, and 
the Sedums and Sempervivums adorn these with so 
much interest and beauty, that it seems worth while 
to emphasise their value and especially to mention 
that certain somewhat tender Sedums deserve a 
place on the choicest rockeries, 
Special care should be taken to place plants which 
