Curlytop Knotweed, Willow Weed, Dock-leaved Smartweed, Curlytop Smartweed, Nodding Smartweed, Curltop Lady's Thumb, Persicaria lapathifolia, Buckwheat family (Polygonaceae)

Found in moist or wet soils near streams and lakes
Seen blooming on August 3, 2018 by Abiquiu Lake

Grows from 4 to 30 inches tall with thick, erect, reddish stems and narrow lance-shaped leaves, sometimes with a dark blotch in the middle of the leaf which gives it one of its many common names, Lady’s Thumb. The tiny pale pink to greenish-white flowers grow in a dense nodding spike up to 3 inches long. The whole plant is antiseptic and astringent. An infusion has been used in the treatment of stomach complaints and fevers. The plant produces a soft white mass, a froth like that of soap. It is applied externally to burns and is used for bathing, and washing clothes. Source.
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If you want to identify a different flower then you might find it useful to check what was blooming this time last year. If you cannot identify a flower from the website send a photo and where you took it to contact@rockymountainsflora.com. Read online for tips