Carex wahuensis ssp. herbstii T. Koyama

Herbst’s Oahu Sedge (Carex wahuensis ssp. herbstii)

The Oahu Sedge (Carex wahuensis C.A. Mey.) (see photo) is endemic to the Hawaiian Islands where it seems to be quite common and widespread.

One of the three recognized subspecies, however, was obviously restricted to a single locality in the Moanalua Valley in the Ko’olau Mountains on O’ahu, Hawaiian Islands and appears to be known by only a single collection.

This form is now considered extinct.


Oahu Sedge (Carex wahuensis C. A. Mey.); nominate form

Photo: Damon Tighe


edited: 21.09.2020