By a combination of chance and design, we have a wide assortment of yellow flowers spread across our yard this season, and that’s in addition to the bison bur flowers I mentioned recently.
Pumpkin flowers around and on the Eastern Redbud in the front lawn, as well as some yellow on the many dill plants, mostly in the mulch. 
An evening primrose volunteered in the front yard with small yellow flowers. 
Yellow flowers in our cantaloupe bed and the first indication of a formed cantaloupe. 
So many yellow flowers on the tomato plant, many of which have already become delicious cherry tomatoes.
While the pumpkin flowers are deliberate, the pumpkin vines climbing up the redbud are not; we have been removing young fruit as it forms there. The redbud is barely taller than I am, and the pumpkins are the large white carving pumpkins we grew last year. (And then saved the seeds from, of course.)