440 THE NURSERY-MANUAL 



Xanthosoma. Aracecs. 



Handled by offsets and by dividing the root-stock. See Aracea. 

 Xeranthemum. Composites. 



Annuals propagated by seeds, usually sown in the open. 



Yucca (Spanish Bayonet). Liliacece. 



Multiplied by seeds and offsets ; also by cuttings of stem and 

 rhizome. 



Zaluzianskya (Nycterinia). Scrophulariaceoe. 



Grown from seeds sown indoors in spring or in autumn and 

 plants wintered in a coldframe. 



Zamia. Cycadacece. 



Increased by division of the crowns when possible ; or by seeds 

 and suckers (offsets). The plants are oftenest imported directly 

 from the tropics. See Cycas. 



Zantedeschia (Calla of florists). Araceae. 



Propagated by offsets, which should be removed and potted 

 when plants are at rest; old crowns may be divided. This is the 

 plant known as Calla cethiopica and Richardia africana. Some of the 

 zantedeschias are grown from seed. See Aracece, page 239. 



Zjmthoxylum (Prickly Ash). Rutaceoe. 



Multiplied by seeds, suckers, but more often by root-cuttings. 

 Zea: Maize. 



Zebrina (Wandering Jew). Commelinaceoe. 



Very easily multiplied by single-joint cuttings of the trailing 

 shoots. These shoots root at the joints if allowed to run on moist 

 earth. This is the wandering jew with reddish foliage and flowers ; 

 the green-foliaged and white-flowered one is a tradescantia. 



Zenobia. Ericaceae. 



Propagated by seeds and layers ; also by cuttings of half-ripened 

 wood in July, placed in gentle heat, or by greenwood cuttings from 

 forced plants. 



Zephyranthes (Zephyr Flower). AmaryVidacece. 

 Multiplied by seeds and by the bulbels or offsets. 



