XANTHOCERAS ZEBRA-GRASS. 335 



Xanthoceras. Sapindacecz. 



Usually multiplied by seeds ; root cuttings are some- 

 times used. 



Xanthorrhiza, Zanthorhiza. Ranunculacecz. 



Seeds and suckers. 

 Xanthorrhoea (Black Boy, Grass-tree). Juncacecz. 



Seeds ; but usually by offsets. 

 Xanthosoma, including Acontias. Aroidece. 



May be increased by cutting up the stem or rootstock 

 into small pieces and planting these in light soil, or cocoa 

 fiber, in bottom heat. After a stem has been cut off a 

 number of shoots are developed, which can be treated as 

 cuttings. 



Xerophyllum. Liliacecz. 



May be propagated by seeds and by division. 

 Xiphion. See Iris. 

 Xylophylla. See Phyllanthus. 

 Yam. See Dioscorea. 

 Yellow-wood. See Cladrastis. 

 Yew. See Taxus. 

 Yucca (Adam's Needle, Bear's Grass, Spanish Bayonet). 



Liliacecz. 



Increased by seeds ; and by divisions, which may be 

 planted in the open ground, or by pieces of thick, fleshy 

 roots, cut into lengths, and inserted in sandy soil, in heat. 



Yulan. See Magnolia. 

 Zamia. Cycadacea. 



Division of the crowns when possible ; or by seeds and 



suckers. The plants are oftenest imported directly from 



the tropics. See Cycas. 



Zanthorhiza. See Xanthorrhiza. 



Zanthoxylum (Prickly Ash). Rutacetz. 



Seeds, suckers, but more often by root cuttings. 



Zea. See Maize. 

 Zebra-grass. See Miscanthus. 



