I've got two candidates for this game; the first one is a perennial; I've been calling it phlox for years.

It grows to 28 to 40 inches tall on a slender stem, with each flower on a seperate, short (3 inchs or so) stem. All the flowers cluster near the top six inches or so of the plant. The flowers are between one-half and five eigths of an inch in diameter and the trumpet is between three eigths and one half inch deep. Bumble Bees seem to love them. And, so far, they fit the descriptions I've got for phlox.

Except that all my write-ups and illustrations for phlox indicate FIVE petalss, and these only have four . . .

First view, a bit of a close up: