THE NURSERY-LIST 405 



Pterostyrax. Styracacece. 



Propagated by seeds, layers, and greenwood cuttings under glass. 



Ptychosperma : Archontophoenix. 



Pueraria. Leguminosos. 



Propagated by seeds when procurable, division of the roots, and 

 cuttings. The kudzu vine (P. hirsuta, known in the trade as P. 

 Thunbergiana and Dolichos japonicus) grows readily from seed and 

 may be multiplied by division of the great root. 



Pumpkin (Cucurbita, three species). Cucurbitaceoe. 



Propagated by seeds, when the weather is settled ; frost-tender. 



Punica : Pomegranate. 



Puschkinia, Adamsia. Liliaceoe. 

 Propagation by bulbels and seeds. 



Puya. Bromeliacece. 



Propagation as for billbergia, which see. 



Pyracantha (often included in Cratsegus). Rosacece. 



Propagated by seeds, by cuttings of ripened wood in fall under 

 glass, kept in winter in a temperate greenhouse, by layers, and by 

 grafting on hawthorn or cotoneaster. Seeds should be treated as for 

 cratsegus and may not germinate the first year. 



Pyrethrum. Composite. 



The pyrethrums are chrysanthemums and are propagated as are 

 other cultivated members of that genus, by seeds and cuttings. 

 The common garden pyrethrums grow readily from seeds, blooming 

 the second year or sometimes the first year if started early under 

 glass. Increased also by division. 



Pyrola (Shin Leaf. Wintergreen). Pyrolacecs. 



Multiplied by division ; very rarely from seeds and with difficulty. 



Pyrostegia (Bignonia venusta). Bignoniacece. 



Propagation by seeds and cuttings as for bignonia, which see. 



Pyrus (Apple. Pear). Rosacece. 



The ornamental species and varieties of apples and crabs are 

 budded or grafted on common apple seedling stocks. Layers and 

 green cuttings are occasionally employed for various species and 

 varieties of Pyrus. See also Apple, Pear. It is a good plan to obtain 



