Assistance provided by @mjpapay
For observation: https://www.inaturalist.org/observations/135795891

The key trait is usually the morphology of the calyx lobes.

In green calyx that immediately subtends the colored part of the flower, if the elongate calyx lobes are

smooth, bald, and toothless = Lobelia amoena (usually stream side)
pubescent similar to stem, the pubescence increased to short hairs = Lobelia puberula
not pubescent but with long bristly ciliate hairs = Lobelia syphilitica (underside of floral tube usually distinctly striped white)
bald, but margin with sparse but distinct chunky teeth = Lobelia georgiana

Posted on October 13, 2022 05:20 PM by amypadgett