126 HAKDY OENAMENTAL 



has greenish-white flowers ; and P. caerulea Colvillei has 

 white sepals and a blue fringe. The latter is of more 

 robust growth, and more floriferous than the species. 

 Turfy loam will suit their wants. 



Paulownia (Scrophularineae), 



PAULOWNIA IMPEEIALIS. Japan, 1840. This is a hand- 

 some, fast-growing tree, and one that is particularly 

 valuable for its ample foliage and distinct and showy 

 flowers. Though perfectly hardy, in other respects it is 

 unfortunate that the season at which the Paulownia 

 flowers is so early that, unless the conditions are unusually 

 favourable, Fthe flower buds get destroyed by the frost. 

 The tree grows to fully 40 feet high in this country, and is 

 a grandly decorative object in its foliage alone, and for 

 which, should the flowers never be produced, it is well 

 worthy of cultivation. They are ovate-cordate, thickly 

 covered with a greyish, woolly tomentum, and often 

 measure, but particularly in young and healthy trees, as 

 much as 10 inches in length. The Foxglove-like flowers 

 are purplish-violet and spotted, and borne in terminal 

 panicles. They are sweetly scented. When favourably 

 situated, and in cool, sandy loam or peaty earth, the 

 growth of the tree is very rapid, and when a tree has been 

 cut over, the shoots sent out exceed 6 feet in length in one 

 season, and nearly 2 inches in diameter. There are many 

 fine old trees throughout the country which testify to 

 the general hardihood of the Paulownia. 



Pavia* See ./Esculus. 



Periploca (Asclepiadeae), 



PEBIPLOCA GR.ECA. Poison Vine. South - Eastern 

 Europe, and Orient, 1597. A tall, climbing shrub, with 

 small, ovate-lanceolate leaves and clusters of curious 



