Small flowers no more than .5 in wide, beardless. Leaves hairless, round, 0.5- .75 in wide. Flower stem no more than 3 in tall. Greenish yellow center, orange style tipped in green. Prominent purple veins
Tiny guys in a cattail mat. Flower .5 inch across, leaves hairless and not more than an inch across
Small flowers no more than .5 in wide, beardless. Leaves hairless, round, 0.5- .75 in wide. Flower stem no more than 3 in tall. Greenish yellow center, orange style tipped in green. Prominent purple veins
Tentative ID. I've never seen black knot on a plum before, but a hasty google search tells me it happens?