238 THE NURSERY-BOOK. 



duced in accordance with the weather and season, and be- 

 yond that, no attempt at resting made. In cases, however, 

 where plants have been divided or made into cuttings, a very 

 limited supply of water is needed at first ; but to prevent ex- 

 haustion, the atmosphere should always be kept laden with 

 moisture. 



Oreopanax. Araliacece. 



Seeds, and cuttings of the young shoots, or division of well 

 established plants. 



Ornithogalum (Star of Bethlehem). Liliacece. 



Seeds. Commonly by bulbels, and by division of the 

 clumps. 



Ornus. See Fraxinus. 

 Orobus (Bitter Vetch). Leguminosce. 



Readily propagated by seeds, or by dividing the tufts. 

 Orontium. Aroidece. 



Commonly increased by division, but seeds may be used. 

 Orpine. See Sedium. 

 Osage Orange. See Maclura. 

 Osier. See Salix and Cornus. 

 Osmanthus (Japan Holly). Oleacece. 



Propagated by cuttings under glass, or by grafting on os- 

 manthus stock, or on privet. 



Osmunda (Flowering Fern). Filices. 



Mostly by division ; sometimes by spores. See Ferns. 

 Ostrya (Hop Hornbeam, Ironwood). Cupuliferce. 



Best grown from seeds. Also increased by layering ; or it 

 can be grafted. The European species is often grafted upon 

 the hornbeam (carpinus). 



Otkonna, Aristotela, including Doria (Ragwort). Composite. 



Very easily propagated by seeds and cuttings. The leaves 

 also take root. 



Ouvirandra (Lattice-leaf). Naiadacea . 



The plants are divided, or seeds are used when they can 

 be obtained. 



Oxalis. Gtraniacece. 



Seeds, divisions and cuttings. The tuberiferous species 

 are increased by the small tubers which form upon the roots. 



