306 THE NURSERY LIST. 



Pseudotsuga. Conifer ce. 



Propagated the same as Abies, which see. 

 Psidium. See Guava. 

 Psoralea Leguminos<z. 



Seeds, divisions and cuttings of growing shoots, placed 

 under glass. The tubiferous species, as the " pomme 

 blanche ' ' or Indian potato (P. esculentd) are increased by 

 tubers or divisions of them. 



Ptelea (Hop-tree). Rutacetz. 



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

 layers. The varieties may be grafted on the common 

 forms. 



Pteris (Brake, Bracken). Filices. 



Easily grown from spores. See Ferns. 

 Pterocarya. Juglandacete. 



Increased by seeds, suckers and layers. 



Ptychosperma, Seaforthia (Australia Feather-palm). Pal* 

 macecz. 



Seeds in heat. 



Pulmonaria See Mertensia. 

 Pumpkin ( Cucurbita, three species). Cucurbitacece. 



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). Ericacefz. 



Propagated by division ; very rarely from seeds. 



Pyrus. Rosacece. 



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 usually lie dormant until the second year, or the 

 varieties are budded or grafted upon stocks of the com- 

 mon species (P. Aucuparia}. Layers and green cuttings 

 are occasionally employed for various species and varie- 



