Starry rosinweed? This one had leaves in whorls of four instead of three. It probably was introduced in this location by planting/sowing though I'm not sure how long ago and if this plant came up on its own. Not sure if this was still budding or already fruiting.

1000’s of plants at this truly bizarre site. The Silphium seems to be all that is left of what must have been a large prairie, which was gouged and bisected by Rt. 19 in the last ~25 years. There are scattered native species accompanying it, but aside from the junipers, the most abundant here is non-native and invasive species. Although the parts of Bracken County that are not wetland and river-adjacent are under-botanized, it is a bit mind boggling that this population (and the natural community that went with it) went unnoticed by collectors in the past.

Thanks @alex_abair for your (quick!) feedback on observation https://www.inaturalist.org/observations/227662948.

I went back to take a few green balls, and open 2. Pictures show what was found.

Videos at https://youtu.be/JBFd6UiQw4E?feature=shared
and https://youtu.be/JR4R8Z9CCJ0?feature=shared

So we have (developing?) galls, @louisnastasi. Your info @friesen5000.

Remember: all with cheap clip-on macro lens attached to cell camera.

Time: 15:29, 22°C, Feels Like 22°C, Partly Cloudy, Estimated 24 Hr Rainfall 0.0 mm, NNE Wind 10 kph, Humidity 50%, Dew Point 11°C, Pressure Falling 1025.1 mb, UV Index 6; Sheffield Towne Weather Station (KILSCHAU41)

Photos 1 and 2 are wasp 1.
Photos 3 to 6 are wasp 2.
Photos 7 and 8 are wasp 3.
But it could also be 1 or 2 wasps that changes spot.
Same garden as usual, still no signs of galls (unless I don't know what to look for).

After leaving Washington-on-the-Brazos State Historical Site, I made a few observations along the road through Washington, Fayette, and Lee Counties, none of which are in a Texas CNC metroplex.
Second day of the 2024 City Nature Challenge: Global Project.