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Vincetoxicum hirundinaria [Swallow-wort]

fluorescence
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#1 Nico

    Nico Chalwatzis

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Posted 02 July 2013 - 16:49

Chalwatzis, N. 2013. Vincetoxicum hirundinaria Medik. (Apocynaceae). Swallow-wort. Flowers photographed in visible and ultraviolet light, including fluorescence.

Vincetoxicum hirundinaria Medik.
Syn.: Asclepias vincetoxicum L., Cynanchum vincetoxicum (L.) Pers.

DE: Schwalbenwurz
EN: Swallow-wort, Swallowwort


An herbaceous plant native to Europe that is found on calcareous soils. The plant contains toxic glycosides.
Flowers were photographed near Bensheim, Germany 8 June 2013 (UV reflexion) and 11 June 2013 (fluorescence).
UV- images were taken with a broadband-modified Panasonic Lumix G1 and the EL-Nikkor 80mm/f5.6 at f8.

Visible light image with IR-neutralisation-filter ND (Optic Makario), ISO 100
Attached Image: NCH_P1090067_130608-2.JPG
image reference: NCH_P1090067_130608

UV-image, Baader U-filter 2”, ISO 400, sunlight:
Attached Image: NCH_P1090068_130608-2.JPG
image reference: NCH_P1090068_130608

UV-induced fluorescence, Lumix GH2 with Baader UV/IR cut filter:
Attached Image: NCH_P1180905_130611-2.JPG
image reference: NCH_P1180905_130611


The flowers show only a medium UV-reflexion. In contrast to the “bulls eye” pattern of many other species with a UV-dark centre, V. hirundinaria has petals with UV-dark tips while the centre of the flower is more UV reflective.
The induced fluorescence is also strongest/brightest in the centre.

[published: 2 July 2013]

#2 Andrea B.

    Desert Dancer

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Posted 02 July 2013 - 23:14

What an interesting UV-signature !
And I always enjoy seeing the European flowers which don't grow here.
Andrea G. Blum
Often found hanging out with flowers & bees.

#3 nfoto

    Former Fierce Bear of the North

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Posted 03 July 2013 - 00:07

There are at least two races of V. hirundararia. One with white another with yellow-green flowers. I might have secured a few shots of the latter race, but they aren't properly processed yet. I photographed the white kind in Austria but alas no UV at the time.