Here is a far more modest species compared to the previous entry. Far more modest, but, by measure of distribution range at least, more successful. Native to much of northern North America, Eriophorum viridicarinatum is a species of wet habitats, such as bogs, fens, marshes and wet woods.
Eriophorum viridicarinatum is known as the thinleaf cottonsedge or green-keeled cottongrass. The first vernacular name is more accurate, as it is a member of the sedge family, but cottongrass is used far more often to collectively name the genus. Breaking down the names, Eriophorum means "wool" (the Greek erio) and "bearing" (Gr. phore), while viridicarinatum means "green" (virid) and "keeled" (carina).
Species of Eriophorum can be difficult to tell apart, and I have to admit to having my identification rely in part on a collection made from the area where I photographed. This particular individual was photographed at the flowering stage, whereas most images are taken when the fruiting heads (infructescences) have expanded and the plants are showier.