284 GARDEN FLOWERS. 



soil, and in warm situations, where its vigorous shoots may 

 be well ripened annually. Increased by layers, cuttings of 

 the young shoots, and seeds. 



P. imperialis (imperial) ; hardy tree ; 25 feet ; flowers purplish, 

 in May ; Japan ; 1840. 



PAVIA. [Sapindaceae.] A small group of the Horse- 

 chestnut family, consisting of handsome flowering trees of 

 the smaller class. They grow in any deep lightish garden 

 soil, and are usually increased by grafting on the common 

 Horse-chestnut, or by layers. 



/*. discolor (two-colored) ; hardy shrub ; 4 feet ; flowers red 

 and yellow, in June ; North America ; 1812. P. macrostachya 

 (large-spiked) ; hardy shrub ; 6 feet ; flowers white, in July ; 

 North America; 1820. P. rubra (red); hardy shrub; 6 feet ; 

 flowers red, in June; North America; 1711. The varieties 

 humilis and humilis penditla, both red-flowered, are desirable. 

 These are selected on account of their small size. 



PEA SWEET. See LATHYRUS. 



PEACH. See PERSICA. 



PEDICULARIS. Lousewort. [Scrophularineas.] Hardy 

 and half-hardy perennials, often very handsome, but not 

 very easily grown. Damp peaty soil. Increased by seeds. 

 Many species have been introduced. There are in all about 

 thirty species, but the plants are not common in gardens. 



PELARGONIUM. [Geraniaceas.] A very large family of 

 beautiful plants. The only ones however which call for our 

 attention in connection with the flower-garden are the Scar- 

 let Geraniums, so called, so popular for summer bedding. 

 They require ordinary greenhouse treatment in the winter, 

 or will survive in a warm, light cellar. The varieties are 

 changing every year, and florists' catalogues will afford a fine 

 collection of the various colors of red, pink, and white ; and 

 also fine variegated-leaved kinds. These kinds have sprung 



