150 



FLOWERS OF ROCKS, WALLS, ETC. 



Rue-leaved Saxifrage (Saxifraga tridactylites, L.) 



Small-seeded as it is there is nothing to prevent its occurrence 

 in Glacial beds, but the minuteness of the seeds would seem to prevent 

 their detection. The Northern Temperate Zone of Europe, N. Africa, 

 N. and W. Asia, is the region in which this little plant is found. In 



Great Britain it is present 

 throughout the Peninsula, 

 Channel, Thames, Anglia, and 

 Severn provinces; but not in 

 Radnor or Cardigan in S. 

 Wales, Montgomery, or in N. 

 Wales; in the Trent province; 

 not in Mid Lanes in the Mer- 



M sey province; generally in the 



H umber and Tyne provinces; 

 not in the Isle of Man; in the 

 Lakes province; and only in 

 Haddington, Edinburgh, and 

 Linlithgow in the East Low- 

 lands; in Fife, W. and Mid 

 Perth, Forfar, Aberdeen, in 

 the E. Highlands, and in 

 Easterness, N. Ebudes, E. 

 Ross, E. Sutherland, and Caith- 

 ness; elsewhere from E. Scot- 

 land, that is from Caithness, to 

 Cornwall and Kent, it is other- 

 wise general. It is found in 



Yorkshire at 1800 ft. It is native in Ireland and the Channel Islands. 

 The Rue-leaved Saxifrage is a familiar wall plant, growing abun- 

 dantly on the tops of mud walls or on rocks, rarely on the ground, with 

 Whitlow Grass, and Stonecrop of various kinds. Thale Cress is simi- 

 larly addicted to this same type of habitat. 



This pretty little Saxifrage, so familiar on wall tops, is an erect 

 plant, with usually a reddish single-branched stem, and with leaves 

 wedge-shaped, 3-5-lobed or divided, alternate. The stem-leaves are 

 covered, like many other xerophytes, with absorbent, stalked, sticky 

 glands, which capture insects. The plant may be insectivorous. The 

 lower leaves are entire and spoon-shaped. 



Rl'E-LEAVED SAXIFRAGE (Saxifraga tridaclylites, L.) 



