304 GARDEN FLOWERS. 



icatum (divaricate) ; hardy perennial ; 3 feet ; flowers white, in 

 July; Siberia; 1759. P. on'e/ita/e (E3.stern) ; hardy annual; 

 5 feet ; flowers red, in July ; East Indies ; 1707. P. vacciniifo- 

 Imm (whortleberry-leaved) ; hardy evergreen trailing sub-shrub ; 

 flowers rose, in September ; North India; 1845. 



Pomegranate. See Punica. 



PoxTEDERiA. Pickerel Weed. [Pontederiaceae.] Showy 

 aquatics, suitable for the borders of ponds. Flowers blue, in 

 August. P. atigiistifolia^ ccerulea^ cordata^ and lanceolata, all 

 natives of North America, are hardy perennials. Propa- 

 gated by division. 



Poplar. See Populus. 



Poppy. See Papaver. 



Populus. Poplar. [Salicaceae.] Hardy deciduous trees, 

 some of which are valuable for shade and ornament. Pro- 

 pagated by seeds, layers, and cuttingr. They succeed best 

 in deep, moist, loamy soil. 



P. alba (white Abele-tree) ; 40 feet ; flowers in March ; Bri- 

 tain. P. ajtgulata (angular ; Carolina) ; 80 feet ; flowers in 

 March ; Carolina ; 1 738. P. balsamifeva (balsamic) ; 70 feet ; 

 flowers in April ; North America; 1792. P. balsainifera foliis 

 2/^r/(?^rt;//i' (variegated-leaved) ; flowers in April. P . balsamifera 

 mterjfiedia (intermediate) ; flowers in April. P. balsamifera 

 latifolia (broad-leaved) ; 40 feet ; flowers in April. P. balsaift- 

 ifera suaveolens (sweet-scented) ; 70 feet ; flowers in April ; 

 Russia; 1825. P. balsamifera viminalis (twiggy); 40 feet; 

 flowers in April ; Altai ; 1826. P. betulifolia (birch-leaved ; 

 Black American) ; 40 feet ; flowers in March ; North America. 

 P. Canadensis (Canadian) ; flowers in March ; Canada. P. can- 

 dicans (whitish-heart-leaved) ; 50 feet ; flowers in March ; North 

 America; 1772. P. canescens (hoary); 40 feet; flowers in 

 March ; England. P. canescens acerifolia (maple-leaved). P. 

 canescens ^g/pliaca (Egyptia.n); Egypt. P. canescens Arember^ 

 ;^/^^ (Aremberg) ; 1835. P. canescens Belgica {^€ig\2LTi)\ south 

 of Europe ; 1835. ■^- canescens hybrida (hybrid) ; 40 feet ; flow- 



