SELECT LISTS QF PLANTS. 285 



Grafting is also practicable, using the large fleshy roots of the shrubby 

 kinds, or tubers of the ordinary herbaceous Chinese Paony. The trian- 

 gular side graft is best, if the tubers employed are of large size, and the 

 splice graft on the roots of the shrubby kinds. The grafting should be 

 done in early autumn, and the worked roots stored in some place where 

 they win not become frozen. New varieties are raised from seed, which 

 should be sown in good soil as soon as ripe. They will germinate the 

 following season, but the entire growth will be directed or expended in 

 producing roots and small tubers ; the cotyledons remaining enclosed in 

 the shell of the seed until the spring of the second season. I have raised 

 many hundreds of seedling Paeonies, but never had one appear above 

 ground until the spring of the second season; I have always found 

 them producing roots and tubers the first summer. 



JPaliurtis (Christ's Thorn). — Shrubs of the Ehamnacecs or Buckthorn 

 Family. One species native of Judaea, another of Nepal. The foi-mer 

 has rather slender thorny branches, with fruit resembling a head with a 

 broad-brimmed hat on. Not quite hardy in our Northern States, but 

 often cultivated in greenhouses for the sake of its reputed association. 

 Propagated by layers and cuttings of the roots. The latter grow freely 

 if stored in moist sand or moss during the winter. 



Passiflora (Passion-Flower).— An extensive genus of herbs and 

 climbing shrubs, bearing large and beautiful flowers of various colors. 

 A few of the larger-gi-owing shrubby species, like the common Granar 

 diUa (P. edulis), and the large Granadilla (P. qitadrangiilaris), produce 

 edible fruit, as large as a lemon, and of a similar form. All the species 

 and varieties easily propagated by cuttings of the young shoots planted 

 in sand, and where they can be given moderate heat. 



Paulownta. — A well-known ornamental tree (P. imperialis) from 

 Japan. Its leaves are of immense size, rather downy, and heart-shaped. 

 Flowers large, violet-colored in terminal panicles in spring. The flower 

 buds ai-e often winter-killed in the latitude of New York City, but the 

 trees are hardy. Propagated by seed sown in spring, or cuttings of the 

 roots made in the fall and stored in a moderately warm place during the 

 winter. 



Phellodendron (Cork Tree).— A small genus of deciduous trees of 

 the Butacece or Rue Family, and closely allied to our common Prickly 

 Ash {Zatdluyxylum Americanum), Two species have been introduced — 

 P. Japonicum, supposed to be a native of Japan, and P. Amurense, from 

 the Amoor regions in Asia. Propagated by layers and cuttings of the 

 roots. 



Philadelphus (Syringa). — A very popular genus of ornamental 

 shrubs, natives of North America, Europe and Asia, including Japan. 

 There are probably less than a dozen species, but a large number of cul- 

 tivated varieties. Flowers white, and in some of the species sweet 

 scented ; others inodorous. The common European varieties have long 

 been known in our gardens under the name of Mock Orange, as the 



