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Lysimachia nummularia [Creeping-Jenny]


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Rørslett, B. 2013. Lysimachia nummularia L. (Primulaceae). Creeping-Jenny. Flowers photographed in visible and ultraviolet light.

 

Lysimachia nummularia L.

NO: Krypfredløs, krypfredlaus

SE: Penningblad, mynt-lysing, penningarv

DK: Pengebladet Fredløs

FI: Suikeroalpi

DE: Pfennigkraut

EN: Creeping-Jenny

 

A small, creeping perennial species native to Europe and Russia, L. nummularia is widely used as an ormamental plant. Many introductions are by garden escapes. This species thrives on damp soils and can grow inundated on lake shores. The tiny stems rapidly form a mat covering the soil surface. Flowering occurs in mid summer. Dispersal is mainly by vegetative fragments as seedset is poor. The corolla comprise five petals that are fused basally to form a tube. The petals are dotted with glandular hairs on both sides

 

Plants collected and photograped near Oslo, Norway 2003-2010. Same population studied on each occasion.

 

LYSI_NUM_B030626156_VIS.jpg

Image reference: LYSI_NUM_B030626156_VIS.jpg

Visible light: Nikon D1X, Tamron 90 mm f/2.8, daylight.

 

LYSI_NUM_I1007161129_UV.jpg

Image reference: LYSI_NUM_I1007161129_UV.jpg

Ultraviolet light: Nikon D40X, Coastal Optics APO 60 mm f/4, Baader U 2" (Venus) filter, SB-140 flash.

 

The flowers have a variable appearance under UV light. Thee glandular hairs appear darkened and there are darker patches on the basal parts of the petals. Sometimes these darker patches extend almost to the petal tip, other times they are fairly well confined to the petal base.

 

[Published 17 Apr 2013]

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