247 



plants have had U\o years' growth, they may l)c removed into sepa- 

 rate pots, to be continued two or more years, when they may be 

 pkmted out in the open ground in warm situations. 



The second sort is mostly increased by layers, which should be 

 made from the young shoots, and laid down in the early autumn. 

 When they are w^ell rooted, in a year or two, they may be taken off, 

 and planted in pots separately filled with bog earth, or in a warm 

 border of the same sort of earth. This is more hardy than the 



former. 



The third sort is increased in the same way as the first, and re- 

 quires similar management. 



The fourth is preserved with difficulty in this climate, but may 

 be raised by layers. 



The most of the plants may likewise be increased by suckers, 

 which should be taken off and planted in the spring, in nursery rows, 

 for two or three years, when they may be removed to the places 

 where they are to grow. 



These plants, in the more hardy sorts, afford ornament and variety 

 in the fronts of shrubbery borders and clumps; and in the more 

 tender sorts, among other potted green-house plants. 



2. LINUM AllBOKEUM. 



TREE FLAX. 



This genus contains plants of the herbaceous, annual, and peren- 

 nial shrubby kinds. 



It belongs to the class and order Peniandria Pentogynia, and ranks 

 in the natural order of Gruinales. 



The characters are: that the calyx is a five-leaved lanceolate 

 perianthium, upright, small, permanent: ihc corolla funnel-form: 

 petals five, oblong, gradually wider above, obtuse, more spreading, 



