Calamagrostis hillebrandii is a species of grass in the family Poaceae known commonly as Hillebrand's reedgrass.Calamagrostis hillebrandii. Integrated Taxonomic Information System (ITIS). It is endemic to Maui in Hawaii, where there are only two known subpopulations with a total of perhaps 500 individuals. This is a federally listed endangered species of the United States.Determination of Endangered Status for 38 Species on Molokai, Lanai, and Maui; Final Rule. Federal Register May 28, 2013.
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