Mimulus guttatus - Monkey Flower

Phylum: Magnoliophyta - Class: Equisetopsida - Order: Lamiales - Family: Phrymaceae

Mimulus growing beside a stream


Monkey Flower (sometimes written as either Monkey-flower or Monkeyflower) is a perannial plant that grows to a height of 0.6m. The stalkless ovate leaves are green and hairless and borne in opposite pairs along the stems.

Monkey Flower, southern Ireland

Tiny red or red-brown spots within the mouth of the flower help distinguish it from the smaller Musk Monkey-flower Mimulus moschatus and more boldly red-spotted import from Chile known as Blood-drop Emlets. Flowers are 3 to 4cm long, open-mouthed with two lips, the upper of which is bi-lobed while the lower lip is tri-lobed, and borne in a lax cyme (a flat-topped inflorescence whose central flowers open first, followed some time later by the peripheral flowers).

A closeup of the pretty yellow flowers of Mimulus guttatus


A distant relative of the Foxglove and a former member of the family Scrophulariaceae, from which it was recently evicted, this short, creeping perrennial is often found growing beside ponds and streams, often trailing right into the surface. Some plants grow with their roots actually in shallow water.

Mimulus guttatus growing in a stream margin


This plant is common in parts of England and Scotland but is scarce in Ireland. It was originally brought to the UK from islands off the coast of Alaska and has since spread widely from gardens into the countryside. Monkey Flower is also found throughout northern and central Europe.

Mimulus guttatus beside the River Nire near Clonmel, Ireland

The plants seen on this page were growing beside a chalkstream in southern England and on the exposed gravel beside an Irish spate river.

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