Spermatophytes (seed plants): Angiosperms (flowering plants): Monocots: Asparagales
Dig deeper at SERNEC, a consortium of southeastern herbaria.
COMMON NAME:
Butcher's Broom, Knee Holly
If a search such as "Carex leptalea var. leptalea" doesn't deliver the results you want, try "Carex leptalea".
Or, to minimize chances of a misspelling, try just "Carex le".
Less is more: If "pencil flower" doesn't deliver the results you want, try "pencil".