DESCRIPTIVE LIST OF THE BEST KINDS 257 



family (Geraniaceae), T. polyphyllum is an attractive 

 plant, with much divided grey leaves, and bearing a 

 profusion of yellow blooms in June. It needs a dry, 

 sunny place among the rocks, and a well-drained, sandy 

 soil. T. tuberosum (the Peruvian Nasturtium) has, as 

 its name implies, tuberous roots. They are not hardy, 

 except under very favourable conditions, and it is wise 

 to lift and store them in autumn. The plant is of slender 

 climbing growth, but may be so planted that its stems 

 fall over rockwork. The flowers, which are red and 

 yellow, open in August and September. 



Veronica (Speedwell). Many of the herbaceous 

 Veronicas (as distinguished from the New Zealand 

 shrubby kinds) are charming rock-garden flowers 

 (natural order Scrophularinae). They are easy to grow 

 in ordinary soil that is well drained, and like a sunny 

 spot. The showiest of all is V. rupestris (synonym 

 V. Teucrium dubia), a free-growing trailer that becomes 

 smothered in little spikes of blue flowers in June. V. 

 repens forms a very close evergreen carpet, studded in 

 May with tiny pale blue blossom. Other good sorts are 

 V. pectinata, blue, and its variety rosea, rose ; V. Allioni, 

 blue ; V. caespitosa, rose ; and V. circaeoides, blue and 

 white. Propagation is most easily effected by division in 

 September. 



Yiola. There are some attractive rock-garden flowers 

 among the Violas, which belong to the natural order 

 Violaceae. Unless it is stated otherwise, they thrive in 

 ordinary rock-garden soil. The twin-flowered Viola, 



