St. John
The taxon authority St. John may refer to:
- Edward Porter St.John (1866–1952, E.P.St.John), U.S. botanist
- Harold St. John (1892–1991, H.St.John), U.S. botanist
- Orestes Henry St. John (1841–1921), U.S. geologist, palaeontologist and scientific illustrator
- Robert Porter St.John (1869–1960, R.P.St.John), U.S. botanist
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