Wintergreen and blueberries.

July 3.The Chimaphila umbellata, wintergreen, must have been in blossom some time. The back side of its petals, "cream colored tinged with purple," which is turned toward the beholder, while the face is toward the earth, is the handsomest. It is a very pretty little chandelier of a flower, fit to adorn the forest floor.

The pickers have quite thinned the crop of early blueberries where Stow cut off winter before last. When the woods on some hillside are cut off, the Vaccinium Pennsylvanicum springs up, or grows more luxuriantly, being exposed to light and air, and by the second year its stems are weighed to the ground with clusters of blueberries covered with bloom, and much larger than they commonly grow, also with a livelier taste than usual, as if remembering some primitive mountain-side given up to them anciently. 

I am surprised to see how suddenly, when the sun and air and rain are let in, these bushes, which, in the shade of the forest, scarcely yielded the walker a berry, will suddenly be weighed down with fruit. Such places supply the villagers with the earliest berries for two or three years, or until the rising wood overgrows them and they withdraw into the bosom of Nature again. They flourish during the few years between one forest's fall and another's rise.

H.D. Thoreau, Journal, July 3, 1852 

Chimaphila umbellata, a/k/a pipsissewa is not American wintergreen (Gaultheria procumbent)--which HDT calls “checkerberry.". See  November 16, 1858 (“Methinks the wintergreen, pipsissewa, is our handsomest evergreen, so liquid glossy green and dispersed almost all over the woods.”)