Could be styloflexa alternatively
Former mowed area left unmowed about 10yr. I went back to area where had found probable Desmodium nuttallii in 2017 (https://www.inaturalist.org/observations/7787965). Plants are still there in 2021, but habitat is grown up and they are no longer in sun, none blooming or fruiting. Took measurements - Stipules 6mm, terminal leaflet 6cm x 2.8cm, petiolule 7mm; side leaflets 4.5cm x 2.1cm, petiolule 2mm; petiole 3cm. Underside of leaf very hairy with appressed hairs especially on veins. Stem pubescent.