Jack Dykinga / Agave (Agave havardiana) and Sotol (Dasylirion texanum) growing in Chihuahuan Desert, Chisos Mountains, Big Bend National Park, Texas, USA, March.

Edwin Giesbers / Mountain fleeceflower (Persicaria amplexicaulis) flower, TU Delft Botanical Garden, Netherlands, August

Ernie Janes / Red bistort (Persicaria amplexicaulis) in bog garden, England, UK, August.

Nick Upton / Red Bistort (Persicaria amplexicaulis) flowering. Wiltshire, UK, July.