Agrostis scabra Willd.
Agrostis geminata, Agrostis scabra var. geminata
Basis for Former Listing
Agrostis geminata (twin bentgrass) is part of an extremely variable and widespread aggregate compilospecies. At various times, at least six taxonomic entities have been included in the aggregate. Some of the entities were considered distinct species and some were considered varieties of species (Harvey 2007).
The accompanying map of North America indicates the states where the aggregate species, A. scabra, has been found.
Basis for Delisting
Since 1984, the genetic uniqueness and taxonomic status of the entity we called A. geminata has been reinterpreted (Harvey 2007). It is now thought that recognizing distinct species and varieties within the aggregate species is unsupported by scientific data. For this reason, A. geminata is now considered an insignificant variant of a widespread and common species named A. scabra. Furthermore, plants fitting the description of A. geminata are not in need of special concern status in Minnesota. Agrostis geminata was delisted in 2013.
Welby R. Smith, MNDNR, 2018
(Note: all content ©MNDNR)
References and Additional Information
Butters, F. K., and E. C. Abbe. 1953. A floristic study of Cook County, northeastern Minnesota. Rhodora 55:21-55.
Dore, W. G., and J. McNeill. 1980. Grasses of Ontario. Research Branch, Agriculture Canada Monograph No. 26. Canadian Government Publishing Centre, Hull, Quebec, Canada. 566 pp.
Fernald, M. L. 1933. Recent discoveries in the Newfoundland flora. Rhodora 35:211.
Harvey, M. J. 2007. Agrostis. Pages 633-662 in Flora of North America Editorial Committee, editors. Flora of North America north of Mexico. Volume 24. Oxford University Press, New York.
Minnesota Department of Natural Resources. 2012. Statement of need and reasonableness. Minnesota Department of Natural Resources. Division of Ecological and Water Resources. St. Paul, Minnesota. 337 pp.