YELLOW PIMPERNEL

Lysimachia nemorum

Myrsine Family [Myrsinaceae]  
Formerly in: Primrose Family [Primulaceae]

month8May month8jun month8june month8jul month8july month8Aug

status
statusZnative
flower
flower8yellow
morph
morph8actino
petals
petalsZ5
stem
stem8round
stem
stem8square(ish)
toxicity
toxicityZmedium

7th June 2008, Woods by Hanging Stone, Rushton Spencer. Photo: © RWD
Often straggly creeping low along the ground like one of its relatives, Creeping Jenny, but Yellow Pimpernel often prefers more shade as afforded by a wood.


10th June 2015, White Peak District. Photo: © RWD
Can grow in nooks and crannies, like just under a step.


16th May 2008, south of Keswick, Cumbria. Photo: © RWD
Or along the ground in open areas just outside a wood.


16th May 2008, Stair, Newlands Valley, Cumbria. Photo: © RWD
The stems can grow to 40cm long, either procumbent or decumbent (as here).


13th June 2008, Paterdale, Cumbria Photo: © RWD
Leaves in opposite pairs, alternately at right-angles along the stem, which is squarish. Leaves are ovate to broad-ovate.


7th June 2008, Woods by Hanging Stone, Rushton Spencer. Photo: © RWD
The flowers, which grow in the leaf axils) have 5 bright-yellow petals.


16th May 2008, Stair, Newlands Valley, Cumbria. Photo: © RWD
The flowers grow on longish but thin stalks from the leaf axils (top centre).


12th May 2017, base of Muncaster Fell, Eskdale, Cumbria. Photo: © RWD
The flowers, with their longish but thin stalks (petioles) long in comparison to their very narrow thickness (narrower than those of Scarlet Pimpernel, which is in a differing genus), are not yet fully open after the rain. [Top centre is the pinkish-white ribbon-like truncated stem of a fasciated Dandelion].


7th June 2008, Danebridge, Staffs. Photo: © RWD
Leaves with about 5 curving veins, peeling off the squarish stem in opposite pairs on stalks (Scarlet Pimpernel does not have stalked leaves).


16th May 2008, Stair, Newlands Valley, Cumbria. Photo: © RWD




16th May 2008, Stair, Newlands Valley, Cumbria. Photo: © RWD
Flowers on longish stalks coming from leaf axils. Leaves with short, curving and winged stems. Flowers with very thin yellow filaments and slightly richer-yellow longish curving anthers.


15th May 2008, Warton Crag (woods), Cumbria. Photo: © RWD
Yellow corolla of flower is 5-8mm across.


16th May 2008, Stair, Newlands Valley, Cumbria. Photo: © RWD
Anthers clearly visible.


25th May 2012, Machell Coppice, East of Coniston Water, Lakes. Photo: © RWD
The lens-shaped gaps between the slightly-overlapping petals is a feature of Yellow Pimpernel.


15th May 2008, Warton Crag (woods), Cumbria. Photo: © RWD
The petals are shiny and grainy. Anthers longish and curved-over.


15th May 2008, Warton Crag (woods), Cumbria. Photo: © RWD
Five paler-yellow filaments topped by richer yellow curving anthers. A single pale green style rises amongst them from the small pale-green centre of the flower.


16th May 2008, Stair, Newlands Valley, Cumbria. Photo: © RWD
The exceptionally narrow and long sepals are readily visible in these young flowers.


16th May 2008, Stair, Newlands Valley, Cumbria. Photo: © RWD
Oppositely paired leaves in quadrature up the stem. Flower buds not yet opened.


16th May 2008, Stair, Newlands Valley, Cumbria. Photo: © RWD
Leaves are on shortish but winged stalks, which curve upwards along the stem a short way before turning at right-angles to bear the leaf.


Some similarities to : Creeping Jenny (to which it is related) but yellow pimpernel has petals that are (when not closed in cloudy weather) more pointed, have more space between petals, and are not cup-shaped. It also has styles that stick out much more prominently upwards from the flowers. Also, Creeping Jenny has square stems whereas they are round in Yellow Pimpernel.

Obvious resemblance to : Scarlet Pimpernel, (Anagalis arvensis, to which it is related) except that it is in a differing genus and the flowers are yellow (not scarlet red).

Despite similarities in appearance and highlighted in its common name Yellow Pimpernel, it is not directly related to Scarlet Pimpernel (Anagallis arvensis) being in a differing genus (but still within the same Family (now Primulaceae in APGIV). Yellow Pimpernel(Lysimachia nemorum) is in the same genus (Lysimachia) as some other yellow-flowered plants: Creeping Jenny (Lysimachia nummularia) with some being far taller - the Loosestrifes, such as Yellow Loosestrife (Lysimachia vulgaris).

Apparently Yellow Pimpernel is poisonous but your Author can find very little information on which particular constituents it possesses. Triterpenoid Saponins in the roots are mentioned, but are not specifically named!

The Lysimachia genus contains plants containing, one researcher says, HydroxyCinnamic Acid, Saponins, Flavonoids, Tannins and the BenzoHydroquinones Embelin (which is orange) and Rapanone, which is not much to go on. Your Author guesses that Yellow Pimpernel has not been much researched. Note that it is the Lysimachia genera overall which contain these; Yellow Pimpernel is not specifically mentioned as containing any of those, although it might...


  Lysimachia nemorum  ⇐ Global Aspect ⇒ Myrsinaceae  

Distribution
family8myrsine family8Myrsinaceae

 BSBI maps
genus8Lysimachia
Lysimachia
(Loosestrifes)

YELLOW PIMPERNEL

Lysimachia nemorum

Myrsine Family [Myrsinaceae]  
Formerly in: Primrose Family [Primulaceae]

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