In weedy mowed area by gutter downspout.
Phenotypic holbrooki. Unfortunate DOR and covered by fire ants.
Collected. County Record.
Tree killed back from herbicide but resprouted.
Same plants as pictured in @danbadlands observation here: https://www.inaturalist.org/observations/116204658
Shady roadside, sizeable colony (at least 30 ft wide)
Petals 7–8mm long
Largest leaflets up to 9cm, but most 5–7cm
A few rather large petioles measured about 20–22cm, but most were under 15cm long
This species has been something of a white whale for me. I'm happy to have finally found it!