in Thoreau’s Journal:

Crossing Fair Haven the reflections were very fine—not quite distinct, but prolonged by the fine ripples made by an east wind just risen— At a distance, entering the pond, we mistook some fine sparkles, probably of insects—for ducks in the water—they were so large, which when we were nearer, looking down at a greater angle with the surface—wholly disappeared. Some large-leaved willow bushes in the meadow southeast of Lee’s reflected the light from the under sides of a part of their leaves—as if frost-covered, or as if white asters were mingled with them. We saw but two white lilies on this voyage—they are now done. About a dozen pontederia spikes—no Mikania (that is now white or grey) four or five large yellow lilies, and two or three small yellow lilies. The Bidens Bechii is drowned or dried up—& has given place to the Great Bidens, the flower & ornament of the river sides at present—& now in its glory, especially at I.  Rice’s shore—where there are dense beds. It is a splendid yellow Channing says a lemon yellow—& looks larger than it is (two inches in diameter, more or less). Full of the sun. It needs a name. I see tufts of ferns on the edge of the meadows at a little distance—handsomely tipped on edge with cinnamon brown—like so many brown fires—they light up the meadows— The button-bush every where yellowing.