250 ALPINE FLOWERS AND ROCK GARDENS. 



more especially as the plants are not particular as to 

 soil and are easily propagated. Several of the old 

 species are suitable, although the modern varieties are 

 too tall. AzureuSj one foot high, with blue flowers in 

 August, and its fine blue variety Jaffrayanus ; glaher^ 

 one foot, with purple flowers in August ; Menziesii, 

 with purple, lilac and red flowers in early summer, and 

 its lilac variety Scouleri, which is better than the type, 

 forms a pretty evergreen shrub, and may be propagated 

 by cuttings of the young shoots in a warm frame ; 

 pubescenSy with lavender flowers in July ; and Hartwegi, 

 with scarlet flowers in July; are all good. All can be 

 raised from seed sown in a frame in spring, and are 

 hardy. 



PHLOX.—See Chapter X. 



PHYTEUMA (Horned Rampion). — ^The species 

 comosum, which grows about six inches high and bears 

 blue flowers in summer, is a pretty and popular rock 

 plant. It thrives in loam with plenty of limestone 

 grit, in a sunny place. It may be raised from seed in 

 spring, and increased subsequently by division if 

 required. There are several other species. 



POLEMON lU M . — A genus containing several good 

 plants, notably Richardsoni, which bears blue flowers 

 a foot high in summer. It could be used for the rockery 

 together with humile and reptans, both Alpines growing 

 about six inches high and with blue flowers in summer. 

 They all Hke gritty loam, and may be propagated by 

 seeds or divisions in spring. P. caeruleum is the well- 

 known Jacob's ladder. Confertum (see photograph) is 

 a good dwarf plant, with blue flowers in summer. 



