34 
UN .ERSHRUBS. 
C. UNDERSHRUBS, BOG PLANTS OR ROCKERY PLANTS 
Ts 
14. 
15. 
Forming cushions or mats: essentially evergreen. 2. 
Not growing in dense mats. 15. , 
Matted Plants. 
. Leaves simple. 3. 
Leaves digitately compound, of 3 leaflets. 14. 
. Leaves brown-scurfy, elliptical. Rhododendron. 
Leaves not scurfy. 4. 2 
. Leaves white-hairy beneath, crenate. Dryas.. 
Leaves not woolly, entire. 5. 
. Leaves crowded close to the ground. 6. 
Leaves on more or less elongated stems. 7. 
. Leaves fleshy. Sedum. 
Leaves not fleshy. Silene. 
. Leaves widened upwards. Diapensia. 
Leaves not widened upwards. 8. 
. Leaves revolute. Empetrum. 
Leaves not revolute. 9. 
. Leaves veinless, crowded. Io. 
Leaves veined. 12. 
. Leaves needle-shaped: moss-like. Cassiope. 
Leaves lanceolate or oblong: more open. 11. 
. Leaves. oblong. Phyllodoce. 
Leaves lanceolate. Phlox. 
. Leaves elliptical or obovate, dotted beneath. Vaccinium. 
Leaves rather lanceolate, not dotted. 13. 
. Stems nearly herbaceous: leaves bristle-tipped. Phlox. 
Stems woody: leaves not bristle-tipped. Pyxidanthera. 
Stipules small. Potentilla. 
Stipules elongated along the leaf-stalk. Sibbaldia. 
Loosely low-bushy: leaves simple. 16. 
Neither matted nor bushy. 38. 
