Taxonomy of Dichanthelium hirstii (Poaceae), a very rare and disjunct witch-grass of the eastern U.S.
After a careful range-wide study of specimens and a review of the taxonomic literature, we have determined that Dichanthelium hirstii (Swallen) Kartesz is taxonomically valid at the rank of species, and is a distinctive member of this complex genus. It is also one of the rarest plants in eastern North America.
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