Explanation of PL XVIII. 



Carex arisanensis HAYATA. 



Fig. 1. The plant, 



2. A portion of a leaf, showing a ligule. 

 2'. A section of the same portion. 



3. A male spikelet, anthers fallen off. 



4. A glume of a male flower. 



5. A glume of a female flower. 



6. 7. Utricles seen from different sides. 



8. Section of the same. 



9. A nutlet. 



