146 HARDY PERENNIALS AND 



Heuchera Ri c hards on i. 



RICHARDSON'S HEUCHERA; Nat. Ord. SAXIFRAGACE^. 

 A TALLER variety than H. Drummondi. The most striking 

 distinctions are the pale green colour of the young leaves con- 

 trasting with the bronzed appearance of the older ones, and the 

 larger size of its flowers, which, however, are green. 

 Cultivation and flowering period, as for other species. 



Houstonia Coerulea. 



BLUETS; Nat. Ord. GENTIANACE^:. 



HARDY and evergreen. This pretty little shining plant never 

 exceeds a height of 3in. Like most species of this order, both 

 flowers and foliage have much substance and endure for a long 

 time in perfection, but its neat form and bright parts most com- 

 mend it it almost sparkles in both leaf and flower. This species, 



FlG. 52. HOTTSTONIA CCERULEA. 



(Natural size.) 



as implied by the specific name, bears a blue flower, but there is a 

 variety (H. c. alba or H. albiflord) which bears white flowers, 

 from a specimen of which the illustration (Fig. 52) is drawn, and, 

 as the colour of the flower is the only dissimilarity, a description 

 of the typical form will in all other respects apply to both. 



