158 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
as well as by its much slenderer wiry stems, &c. S. Bourgaei differs 
Fig. 84. — S. griseum Praeger. 
in its longer, more erect, red (not greyish) branches, green (not 
glaucous) linear (not linear-fusiform) leaves, which are flat above 
(not sub-terete). 
