Polygonum Muhlenbergii. Buckwheat Family.
An aquatic herb, perennial by long creeping or horizontal rootstocks. Stems: erect, commonly simple, channelled, enlarged at the nodes. Leaves: oblong-lanceolate, acute or acuminate at the apex, rounded or cordate at the base, ocrese cylindric. Flowers: small, in a terminal raceme, calyx rose-colour. Fruit: achenes lenticular, broadly obovoid, very convex, black, smooth, shining.
The dense rose-coloured spikes of the Swamp Persicaria may frequently be seen rising above the surface of some forest pool, or fringing its borders. As Emerson has so aptly described it, "Rosy Polygonum, lake-margin's pride," is one of the prettiest aquatic plants amongst the mountains. The steins are channeled and enlarged at the points from which the leaves grow; sometimes they float, and sometimes they are immersed beneath the waters. The leaves are long-shaped and smooth.
Calypso (Calypso bulbosa)