Weedy plant w/tiny purple flowers. Wide mouth facing down, tapering to long, narrow throat, pointed at bottom end. Mouth-beginning of throat has a "protective" flap covering the throat opening, so only three veery small gaps, one on each side of flap, & at the top of flap. Had to tear off the petals to be able to see the pollen-covered stamen, further down in the throat.
Tiny, long-tongued pollinators required.

Found in crack of sidewalk, where lawn grass borders.