NEPHRODIUM NORWAY SPRUCE. 279 



Nephrodium. See Ferns. 

 Nephrolepis. See Ferns. 

 Nerine (Guernsey Lily). Amaryllidacecz . 



Seeds, for new varieties. Commonly increased by 

 means of bulbels. 



Nerium (Oleander). Apocynacecz. 



Layers. Cuttings should be made of natural leading 

 shoots, inserted in single pots and placed in a close, warm 

 frame ; or they may be rooted in bottles of water and 

 afterwards potted in soil. See Fig. 69 a. 



Nertera. Rubiacetz. 



Increased by seeds, divisions, or cuttings. Any small 

 portion will grow freely, especially if placed in a warm 

 frame. 



Nettle-tree. See Celtis. 



New Zealand Flax. See Phormium. 



Nicandra. Solanacecz. 



Seeds, sown in the open border, or under glass in the 

 north. 



Nicotiana ^Tobacco). .Solanacece. 



Propagated by seeds, started under glass or in a care- 

 fully prepared seed-bed. The ornamental species some- 

 times by cuttings. N. alata (N. affinis of gardens) prop- 

 agates by root cuttings. Tobacco is handled essentially 

 like tomato plants. 



Nierembergia. Solanacece. 



Grown from seeds, under glass. Cuttings of firm shoots 

 are also used. 



Nigella (Fennel Flower, Love-in-a-mist). Ranunculacece . 



Propagated by seeds sown in early spring in the open. 

 Nightshade. See Solanum. 

 Nine-bark. See Spiraea. 

 Nolana. Convolvulacece. 



Seeds sown in the open border during spring. 

 Norfolk Island Pine. See Araucaria. 

 Norway Spruce. See Picea. 



