258 THE NURSERY LIST. 



than from seeds. / Horsfallite is largely propagated by 

 layers, and other species may be treated in the same way. 

 Division is sometimes employed. /. panditrata can be 

 propagated by root cuttings. Also grafted (see page 129). 



Ipomopsis. See Gilia. 



Iresine, Achyranthes. Amarantacece. 



Seeds rarely. Increased readily by cuttings. For sum- 

 mer bedding in the north, cuttings should be started in 

 February or March. For use as window plants, they 

 should be taken in late summer. 



Iris, including Xiphion (Blue Flag). Iridacece. 



Seeds grow readily and give good results, and they are 

 usually produced freely, especially in the bulbous species. 

 Sow as soon as ripe in light soil in some protected place. 

 The bulbous species produce bulbels, which may be used 

 for multiplication. The rhizomatous species are propa- 

 gated by dividing the rhizome into short-rooted pieces. 

 Or when the rhizomes lie on the surface of the ground and 

 do not root readily, they may be layered. 



Isonandra ( Gutta-Percha Tree ) . Sapotacecc. 



Insert cuttings in sandy soil, under glass, in heat. 

 Itea. Saxifragace<z. 



Propagated by seeds or by suckers, in spring ; and in 

 autumn by layers. 



Ivy. See Hedera and Ampelopsis. 



Ixia. Iridacecz. 



Seeds may be sown in pans of sandy soil in autumn, and 

 placed in a cool frame. Propagation by bulbels is much 

 quicker, and is the usual method. 



Ixiolirion. Amaryllidacecz . 



Increased by seeds, and by bulbels. 

 Ixora. Rubiacecz. 



Seeds. Usually increased by short-jointed green cut- 

 tings placed in a close frame with a strong bottom heat. 



Jacaranda. Bignoniacecz . 



Cuttings of half-ripened shoots may be made in early 

 summer and placed in sand over sandy peat, in heat, and 

 kept shaded. Also seeds. 



