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Arctium tomentosum [Woolly Burdock]


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Rørslett, B. 2013. Arctium tomentosum Mill. (Asteraceae). Woolly Burdock. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...woolly-burdock/

 

Arctium tomentosum Mill.

Syn. Lappa tomentosa (Mill.) Lam.

 

NO: Ullborre

SE: Ullkardborre, ullig kardborre

DK: Filtet Burre

FI: Seittitakiainen

EN: Downy burdock, woolly burdock

DE: Filzige Klette

 

A medium to large-sized biannual plant (up to 1.5 m tall), A. tomentosum has a wide European and Asian distribution. In Europe, it has an eastern continental occurrence and is probably not native in the British Isles. It prefers nutrient-rich disturbed soils, road verges and wasteland, and is considered a nuisance weed due to the fruit heads (burrs) that stick to anything passing by. The burrs can be annoyingly difficult to remove from one's clothing later.

 

Flowering commences mid to late summer and continues to late August, sometimes even later. The flowers attract a wide range of pollinators, small and large, and they are very popular with butterflies.

 

Plants collected outside Oslo, Norway 4 Aug 2012.

 

ARCT_TOM_B1208042810_VIS.jpg

Image reference:ARCT_TOM_B1208042810_VIS.jpg

Visible light: Nikon D300, 120 mm f/4 Medical-Nikkor lens, built-in ring flash.

 

ARCT_TOM_I1208040164_UV.jpg

Image reference: ARCT_TOM_I1208040164_UV.jpg

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

 

The anther tubes are dark both in visible and ultraviolet light.

 

[Published 12 Apr 2013]

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