Sven Zacek / March Marigolds (Caltha palustris) in flower in wetland woodland floor. Estonia, Europe, May.

WILLIAM OSBORN / King cup flowers / Marsh marigold {Caltha palustris} Gloucestershire, UK

Sandra Bartocha / Marsh Marigold (Caltha palustris) flowering in Alder carr Mecklenburg-Vorpommern, Germany, April

Stephen Dalton / Kingcup / Marsh marigold (Caltha palustris) flowering beside water, UK, April

MYN / Marko Masterl / Marsh marigold (Caltha palustris) in flower, wet woodlands, Kocevje, Slovenia, Europe, April. meetyourneighbours.net project

Hanne & Jens Eriksen / Marsh marigolds (Caltha palustris) flowering, Iceland, June

Philippe Clement / Kingcup / Marsh Marigold (Caltha palustris) in flower. Luxembourg, April.

Philippe Clement / Kingcup / Marsh Marigold (Caltha palustris) in flower. Luxembourg, April.

Stephen Dalton / Marsh marigold moths (Micropterix calthella) on Kingcups / Marsh Marigold. Sussex, UK, May.

Nick Upton / Marsh marigold / King cup (Caltha palustris) clump flowering near the margins of a stream. Wiltshire, UK, April.

Nick Upton / Marsh marigold / King cup (Caltha palustris) clump flowering near the margins of a stream. Wiltshire, UK, April.

Stephen Dalton / Marsh marigold / Kingcup (Caltha palustris) flowers, UK

Chris Gomersall / Marsh marigolds / Kingcups (Caltha palustris) in flower, Wiltshire, April

Chris Gomersall / Marsh marigolds / Kingcups (Caltha palustris) in flower, Wiltshire, April

Robert Thompson / Marsh marigold {Caltha palustris} flowers, Correl Glen NNR, County Fermanagh, Northern Ireland, UK

Roger Powell / Marsh Marigold {Caltha palustris} flowering in old snow melt areas of Honoya island, Varanger, Norway

PREMAPHOTOS / Marsh marigold moth (Micropterix calthella) feeding on buttercup pollen, UK

Niall Benvie / King cups {Caltha palustris} in wetlands with tree reflections in water, Kemeri NP, Latvia

Niall Benvie / King cup / Marsh marigold {Caltha palustris} Otterpark Aqualutra, Leeuwarden, Netherlands

Niall Benvie / King cups {Caltha palustris} in Black alder carr Kemeri NP, Latvia

Bernard Castelein / Marsh marigold flowers (Caltha palustris) Belgium

Simon Colmer / Marsh marigold flower (Caltha palustris) UK

Kim Taylor / Crab spider {Misumena sp.} with Honeybee prey on Marsh marigold, UK.

Philippe Clement / Marsh marigold / Kingcup in flower {Caltha palustris} Belgium

Philippe Clement / Marsh marigold / Kingcup in flower {Caltha palustris} Belgium

Rob Tilley / King cup / Marsh marigold flowers {Caltha palustris} Hokkaido, Japan

Tony Evans / King cup / Marsh marigold flowering {Caltha palustris} UK

Mark Yates / King cups (Marsh marigold) (Caltha palustris). England, UK, Europe