Gladys Turner Nisbet (Grafton, Illinois, 11 September 1895 – Highlands Ranch, Colorado, 7 October 1994) was an American botanist known for researching the genus Penstemon, particularly in New Mexico. Nisbet earned a master's degree in Biology at the University of New Mexico expanding on work she had done as an undergraduate at New Mexico Normal University.Obituary. Springer (New Mexico) News-Bulletin. 28 October 1994. page 4.Springer educator is teacher of the year. Las Vegas (NM) Daily Optic. 13 May 1954. section 1 page 1. A species of fossil coral which she discovered in Arizona, Iowaphyllum nisbeti, is named in her honor.Oliver, W.A. Iowaphyllum (rugose coral) from the upper Devonian of Arizona. Journal of research, U. S. Geological Survey. Vol. 6, No. 6, Nov.-Dec. 1978, p. 7&7-805.

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