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Galium tinctorium [Stiff Three-petaled Bedstraw]


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#1 Andrea B.

    Desert Dancer

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Posted 26 March 2015 - 18:06

Blum, A. G. (2015) Galium tinctorium (L.) Scop. (Rubiaceae) Stiff Three-petaled Bedstraw. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...taled-bedstraw/

Seal Cove, Mount Desert Island, Maine, USA
23 July 2014
Wildflower

Synonyms:
  • Asperula tinctoria L.
  • Galium trifidum ssp. tinctorium (L.) Hara
  • Galium trifidum var. tinctorium (L.) Torr. & Gray
Comment:
G. tinctorium is mostly 3-petaled, but occasionally a 4th petal is seen as in the close-up below. The tiny flower is moderately UV-absorbing with slightly darker tips. Conical cells are in evidence. The stems are quite UV-black.

Reference:
1. New England Wild Flower Society (2015) Galium tinctorium (L.) Scop. Stiff Three-petaled Bedstraw. https://gobotany.new...ium/tinctorium/

Equipment [Nikon D600-broadband + Carl Zeiss 60mm f/4.0 UV-Planar]

Visible Light [f/11 for 1/1.6" @ ISO-400 with onboard Flash and Baader UVIR-Block Filter]
An overview.
Attached Image: galiumTinctorium_VisFlash_20140722sealCoveMdiME_23662pn01.jpg

Visible Light [f/11 for 1/125" @ ISO-400 with onboard Flash and Baader UVIR-Block Filter]
The flowers are mostly 3-petaled, but a 4th petal is possible.
Attached Image: galiumTinctorium_VisFlash_20140722sealCoveMdiME_23678pn0101.jpg

Ultraviolet Light [f/11 for 15" @ ISO-400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]
An overview in UV.
Attached Image: galiumTinctorium_UVBaadSB14_20140722sealCoveMdiME_23670pf.jpg

Ultraviolet Light [f/11 for 1/20" @ ISO-400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]
UV light reveals the textured surface of the tiny petals.
Attached Image: galiumTinctorium_UVBaadSB14_20140722sealCoveMdiME_23709pfCrop100.jpg
Andrea G. Blum
Often found hanging out with flowers & bees.

#2 nfoto

    Former Fierce Bear of the North

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Posted 26 March 2015 - 18:39

You captured the conical cell structure quite well.