Description:Densely greyish mat-forming to 60cm across with rooting stems
Habitat:stabilised gravel beds alongside rivers and sterile gravelly soils elsewhere
| Form of cushion | F_M | Intermediate beetween F & M types |
| Compactness | 1 | Compact, hard (peat-accumulating) |
| Variability | 0 | No variability |
| Root system | A | Numerous adventious roots |
| Woodiness | 0 | Herbaceaous |
| Thorniness | 0 | No |
| Succulence | 0 | No |
| Flowers | 0 | Flowers sessil |