SELECTION OF PLANTS. 335 



and they will begin blowing the end of May, and soon 

 ripen their seeds in the open ground. 



29. CISTUS OBTUSIFOLIUS, Blunt-leaved Cretan 

 Rock Rose. 



This plant requires a little shelter in severe frost ; some 

 of them should be planted in pots, and turned out in the 

 spring. It affects (as all this tribe does) a light sandy 

 loam and peat. 



It is propagated and managed the same as the others of 

 the species. 



It is a native of Crete. 



30. CISTUS INCANUS, Hoary Rock Rose. 



This handsome plant will endure our mildest winters 

 in the open air, but it will require protection in severe 

 frosty weather. It will be prudent to secure some plants 

 in pots, so that they may be preserved in a frame or in a 

 green-house, if the weather should be severe. 



It is always necessary, with these plants, to guard 

 against too much moisture, as they are liable to be in- 

 jured by it. 



It is propagated and managed the same as the rest of 

 the species. 



31. CISTUS CANESCENS, Narrow-leaved Hoary 

 Rock Rose. 



This handsome plant is a native of the South of Eu- 

 rope. It is rather tender, and requires a covering in severe 

 weather. 



It is propagated and managed the same as others of the 

 species. 



