NATIVE PLANTS IN ROCK-WALL 41 



they seem never happier than when they become 

 estabUshed in the wall joints and chinks. Snch a one 

 is the Wood Sorrel, one of the daintiest of spring 

 flowers, whether in wall, garden or wild. Primroses 

 also take kindly to the lower joints on the shady side, 

 and the cool wall-foot is the place of all others for one 

 of the native Irises, /. fostidissima, whose dark green 

 sword -like leaves are good to see throughout the 

 winter, while in October the seed-pods are opening 

 and showing the handsome orange-scarlet fruit. 



Then the Purple Columbine is a grand cool wall- 

 plant ; the delicate yellow-flowered Wood Pimpernel 

 {Lysimachia nemorum) will trail happily in some lower 

 joints ; the larger Moneywort is one of the best of 

 wall draperies ; and even two moisture-loving small 

 things, the Moschatel {Adoxa) and the Golden Saxi- 

 frage {Chrysospleniuni) will be satisfied with the cool- 

 ness of the lowest joints and the comfort of the mossy 

 wall-foot. 



