S.G.Sm. (Britton) 1995 - Smith SG (1995) New Combinations in North American Schoenoplectus, Bolboschoenus, Isolepis, and Trichophorum (Cyperaceae). Novon 5(1): 97. doi: 10.2307/3391840.
There is no corrections for Schoenoplectus pungens var. longispicatus yet.