The wildflowers that I watch for in spring are those of the woods, which I've posted pictures of already. But also in spring the first wildflowers of the meadows start blooming. There will be many more later in the summer.
Perhaps the simplest, found both in the woods and the meadow, is the Wild Strawberry. These ones are out back in our own meadow.
And of course the most ubiquitous wildflower at this time of year, the Dandelion. Admittedly there are more of these in the lawn than in the meadow, but a lawn is a sort of meadow anyway, isn't it? We've never sprayed a lawn to keep it 'perfect', and now that we understand how helpful Dandelions are for bees, we don't even make any effort to remove them by hand. We've almost reached the stage where we enjoy the yellow lawn for 2-3 weeks!
The marsh is a different story. Wildflowers are not so plentiful there over the summer, but for a brief 2-3 weeks right now, they are often yellow with Marsh Marigold. I always watch for these coming out about the same time as the Trilliums in the woods.
They're a simple five-petaled yellow flower, with large shiny green leaves, and they like their feet wet - often growing right in the water (and therefore sometimes hard to photograph). Nature likes variety though; note the four-petaled flower on the right.
But they add beautiful colour to the wetlands for a brief time in spring.