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Caltha palustris [Marsh Marigold]


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Rørslett, B. 2013. Caltha palustris L. (Ranunculaceae). Marsh Marigold. Flowers photographed in visible and ultraviolet light. http://www.ultravioletphotography.com/content/index.php?/topic/76-caltha-palustris-marsh-marigold/

 

Caltha palustris L. (s.lat.)

Syn. C. minor Mill., C. palustris L. ssp. minor (Mill.) Clapham, C. palustris L. var. procumbens Beck (ssp. palustris), C. palustris L. ssp. arctica (R. Br.) Hultén, C. palustris L. var. radicans (T. F. Forst.) Fr., C. radicans T. F. Forst. (ssp. radicans)

NO: Bekkeblom; soleihov

SE: Kabbleka

DK: Eng-Kabbeleje

FI: Rentukka

IS: Hófsóley

DE: Sumpfdotterblume

EN: Marsh Marigold: Kingcup (UK); 'Cowslip' (US: misapplied for Primula)

 

A very common plant of moist habitats in the northern temperate zone, C. palustris is a polymorphic species that inevitably leads to some taxonomic and nomenclature confusion. At least in the Nordic countries, one can differentiate two main races or subspecies; a small-flowered creeping plant (ssp. radicans) with triangular leaves mainly found in mountains along brooks and snow beds, and a large-flowered more upright plant with rounded or crenate leaves common in the lowlands (ssp. palustris). Other races have been described and given subspecific or specific rank, their distribution is not well understood.

 

C. palustris flowers in late April or early May in the lowlands, whilst the mountain plants flower much later often not before mid summer if reaching the flowering stage at all. Many insects visit these flowers which stay open all day even in rain.

 

Specimens photographed near Oslo, 29 May 2012.

 

CALT_PAL_I1205290232_VIS.jpg

Image reference: CALT_PAL_I1205290232_VIS.jpg

visible light. Panasonic GH-2, Coastal Optics 60 mm f/4 APO lens, Baader UV/IR block filter, daylight.

 

CALT_PAL_I1205290224_UV.jpg

Image reference: CALT_PAL_I1205290224_UV.jpg

Ultraviolet light. Panasonic GH-2, Coastal Optics 60 mm f/4 APO lens, Baader U 2" (Venus) filter, Broncolor studio flash (uncoated Xenon tube).

 

The Marsh Marigold features extremely distinct and strongly developed UV marks on the basal part of the sepals. In these UV-dark areas, conical cells are abundant as well.

 

[Published: 17 Jan 2013]

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