DESCRIPTIVE AND SELECTIVE. 245 



is an Alpine, and it is of the true desirable tufty habit. 

 The flowers are blue, with yellow eye, and are pro- 

 duced in abundance in May and June, the plants 

 flowering as fast as they grow. Many varieties, 

 differing in colour, are offered by the seedsmen. 

 Dissitiflora is the earliest, and certainly one of the 

 most popular of the Forget-me-nots. It is a true 

 Alpine, of low tufty habit and with charming light blue 

 flowers. There are several varieties of it. Palustris is 

 the Marsh Forget-me-not, and one of the most beautiful 

 of low growing water plants. One may thrust a few 

 bits between stones on the margin of water in spring, 

 and in a month or so the plant is rambling over the 

 stones and aglow with light blue flowers. It is not 

 tufty in habit like the others. There are several 

 varieties of it. Sylvatica, the wood Forget-me-not, is 

 also taller and looser than the Alpine species. It has 

 blue flowers, but there are varieties with white flowers 

 and with yellow leaves. StaUana bears lavender 

 flowers in July. The different species of Myosotis 

 come true from seed, which may be sown in a box in a 

 frame in summer, or in prepared soil in the open. 



NARCISSUS.— See Chapter IX. 



NIEREMBERGI A. —The most popular member of 

 this genus is gracilis, but it is not suitable for the 

 rockery. Rivtdaris is available, as it is of creeping 

 habit. It bears long white flowers over a considerable 

 period in summer. It likes moist soil, and is easily 

 increased by division in spring. 



NYMPHjEA (Water Lily).— The Nymphaeas 

 are the most beautiful of the aquatic plants, and are 



