in Thoreau’s Journal:

Saw the first blossoms (bright-yellow stamens or pistils) on the willow catkins to-day. The speckled alders and the maples are earlier then. The yellow blossom appears first on one side of the ament and is the most of bright and sunny color the spring has shown, the most decidedly flower-like that I have seen.

It flowers, then, I should say, without regard to the skunk-cabbage, q. v. First the speckled alder, then the maple without keys, then this earliest, perhaps swamp, willow with its bright-yellow blossoms on one side of the ament. It is fit that this almost earliest spring flower should be yellow, the color of the sun..