I found this giant yellowing leaf in the sidewalk planting by that house a few blocks away whose people turned the lot next door (after a tear-down) into a garden (nice extra greenspace for the rest of us…). I forget what the plant is. Leaf is maybe a yard across….
This is what I think of as a small hibiscus bloom. Some are salad-plate sized, but this one is only about three inches across. Retro.