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Vincetoxicum hirundinaria [Swallow-wort]


Nico

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Chalwatzis, N. 2013. Vincetoxicum hirundinaria Medik. (Apocynaceae). Swallow-wort. Flowers photographed in visible and ultraviolet light, including fluorescence. https://www.ultravioletphotography.com/content/index.php/topic/441-vincetoxicum-hirundinaria-swallow-wort/

 

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

post-14-0-58959400-1372783326.jpg

image reference: NCH_P1090067_130608

 

UV-image, Baader U-filter 2”, ISO 400, sunlight:

post-14-0-29958400-1372783598.jpg

image reference: NCH_P1090068_130608

 

UV-induced fluorescence, Lumix GH2 with Baader UV/IR cut filter:

post-14-0-12326200-1372783332.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]

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What an interesting UV-signature !

And I always enjoy seeing the European flowers which don't grow here.

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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.
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