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Tripleurospermum inodorum [Scentless Mayweed]


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Rørslett, B. 2012. Tripleurospermum inodorum (Asteraceae). Scentless Mayweed. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...ntless-mayweed/

 

Tripleurospermum inodorum (L.) Schp.Bip.

Syn. Matricaria inodora L.; Matricaria perforata Mérat; Tripleurospermum perforatum (Mérat) Laínz

NO: Ugrasbalderbrå; vanlig balderbrå

SE: Baldersbrå

DK: Lugtløs Kamille

FI: Peltosaunio; Saunakukka

DE: Geruchlose Kamille

EN: Scentless Mayweed

 

This is a variable species complex comprising a number of described taxa on various taxonomic levels. The complex as a whole has a northern and Circumpolar distribution (Lid & Lid 2005). The main habitats are roadsides and fallow fields and it is in particular common on recently distributed soils due to its massive seed bank. It is closely related to Tripleurospermum maritimum (L.)W.D.Koch, which is native to coastal regions of Europe. The UV signatures of these species are very similar as well, the main difference is that ray flowers of T. inodorum tend to be rendered darker than those of T. maritimum.

 

Specimen collected near Oslo, Norway 4 Aug, 2012

 

TRIPL_INO_B1208042828_VIS.jpg

Image reference: TRIPL_INO_B1208042828_VIS.jpg

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

Left, receptable devoid of ray flowers, right, a normal flower head.

 

TRIPL_INO_I1208040178_UV.jpg

Image reference: TRIPL_INO_I1208040178_UV.jpg

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

 

The presence of conical cells on the ligules is chiefly shown by darker patches with a velvety appearance. Note the regular presence of a dark patch near the base of the ray flower as this pattern differs from that of T. maritimum.

 

References:

Lid, J. & Lid, D.T. 2005. Norsk Flora. 7.ed. by Reidar Elven. Det Norske Samlaget, Oslo.

 

[Published: 23 Dec 2012. Last updated: 18 Jan 2013]

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