Rysce
Bosworth & Toller Anglo-Saxon Old English Dictionary - rysce
According to the Old English Dictionary:
an;
- rysce
- f. A bed of rushes (?) :-- Of bæccæ funtan on ðá riscæan; of ðǽre riscæan on sagelmære, C. D. iN. E. D. rush a thick growth of plants or shrubs; a brake.] rysce