158 ROCK GARDENING FOR AMATEURS 



always be taken into account. The following form a 

 good selection: 



P. Allionii. Found in the fissures of limestone rocks 

 in the Maritime Alps at high elevations. It is some- 

 what rare in cultivation, but well worth a little trouble 



to grow on account of 

 its charming rosy lilac 

 flowers in April. The 

 plants should be 

 wedged tightly into a 

 crevice where they will 

 get plenty of sun. It 

 flowers in April. 



P. A uricula . The 

 typical Auricula of the 

 Alps is found over the 

 mountain ranges of 

 Central Europe. It has 

 somewhat fleshy leaves, 

 glaucous in appearance, 

 and very mealy, while 

 the sweet-scented yel- 

 low flowers are borne, 

 in May, in a dense 

 umbel on stems some 

 five inches in height. 

 It is a limestone plant, 



A remarkabl^nmula from China and ma y be SUCCCSSfuUy 



(P. littoniana). grownin the rock garden 



