carex, = reed-grass, rush or sedge.
(Latin name for sedge)
(In some species the upper florescent spikes are without seeds because the spikes are male) (ld, Le, Cl)
clava, = a knotty branch or stick, a staff, cudgel, club;
-atus, = indicates possession or likeness.
(club-shaped; gradually thickening upwards from a very tapering base) (ld, BL)