INTERDUNAL PONDS AND TAMARACK SWAMPS 199 



Chokeberry (Fig. 242) is a shrub a yard or so high. The 

 leaves are shiny above, paler and covered with fine hairs below. 



Figs. 239-244: Fig. 239. — Leatherleaf, Chamacdapkne calyculata; Fig. 240. — 

 Pitcher plant, leaf and blossom, Sarracenia purpurea; Fig. 241. — Andromeda, 

 Andromeda Polifolia; Fig. 242. — Chokeberry, Pyrus arhutifolia; Fig. 243. — Rush 

 aster. Aster jnnceus; Fig. 244. — Crested shield fern, Aspidium cristatum, under 

 side of one pinnula and outline of sorus. 



The flowers are like apple blossoms and grow in clusters. 



The fruits, like small red apples, are .3 of an inch in diameter. 



One famihar with the birches would recognize the swamp 



birch by its bark. Its leaves are egg-shaped, rounded, or even 



