THE NURSERY LIST. 257 



well with many of the double-flowering plums and cherries, 

 if the wood is grown under glass. 



Pseudotsuga. Coniferce. 



Propagated the same as Abies, which see. 

 Psidium. See Guava. 

 Psoralea. Legttminosce. 



Seeds, divisions and cuttings of growing shoots, placed 

 under glass. The tubiferous species, as the pomme blanche 

 or Indian potato (P. esculenta) are increased by tubers or 

 divisions of them. 



Ptelea (Hop-tree). Rutacece. 



Increased by seeds, sown in autumn or stratified, or by lay- 

 ers. The varieties may be grafted on the common forms. 



Pteris (Brake, Bracken). Filices. 



Easily grown from spores. See Ferns. 

 Pterocarya. Juglandea . 



Increased by seeds, suckers and layers. 

 Ptychosperma, Seaforthia (Australian Feather-palm). Palmce. 



Seeds. 



Pulmonaria. See Mertensia. 

 Pumpkin (Cucurbita, three species). Cucurbit a cece. 



Seeds, when the weather is settled. 

 Punica. See Pomegranate. 

 Puschkinia, Adamsia. Liliacece. 



Increased by dividing the bulbs, which should be done 

 every two or three years. 

 Pyrethrum. See Chrysanthemum. 

 Pyrola (Shin-leaf, Wintergreen). Ericaceae. 



Propagated by division ; very rarely from seeds. 

 Pyrus. Rosacecc. 



The ornamental species and varieties of apples and crabs 

 are budded or grafted upon common apple stocks. The 

 mountain ashes are grown from stratified seeds, which usu- 

 ally lie dormant until the second year, or the varieties are 

 budded or grafted upon stocks of the common species (P. 

 Aucuparia'). Layers and green cuttings are occasionally em- 

 ployed for various species and varieties of pyrus. See also 

 Apple, Pear, Quince. It is a good plan to obtain stocks as 



