Peter Kalm

The botanist Peter Kalm visited Niagara Falls.
Niagara was a natural attraction for botanists like Peter who studied under Carl Linnaeus. (It was actually Linnaeus who came up with the idea to send trained botanists to Niagara.)
There are no records of the plants that Peter collected on this day all those years ago. However, botanists suspect that Kalm's Lobelia and Kalm's Saint John's Wort were both collected there; and that's how they were both named for him by Carl Linnaeus.