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Galinsoga quadriradiata [Gallant Soldiers]

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#1 Andrea B.

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Posted 16 April 2021 - 19:22

Blum, A.G. (2021) Galinsoga quadriradiata Ruiz & Pav., 1798 (Asteraceae) Gallant Soldiers. Flowers photographed in ultraviolet and visible light. https://www.ultravio...llant-soldiers/

Holmdel Park, Holmdel, New Jersey, USA
27 Aug 2013
Wildflower

Synonyms:
  • Adventina ciliata Raf.
  • Ageratum perplexans M.F.Johnson
  • Baziasa urticifolia (Kunth) Steud.
  • Galinsoga aristulata E.P.Bicknell
  • Galinsoga bicolorata H.St.John & D.White
  • Galinsoga brachystephana Regel
  • Galinsoga brachystephana Otto ex Heer & Regel
  • Galinsoga caracasana (DC.) Sch.Bip.
  • Galinsoga ciliata (Raf.) S.F.Blake
  • Galinsoga eligulata Cuatrec.
  • Galinsoga hispida Benth.
  • Galinsoga humboldtii Hieron.
  • Galinsoga plikeri Giacom.
  • Galinsoga urticifolia (Kunth) Benth.
  • Jaegeria urticaefolia (Kunth) Spreng.
  • Jaegeria urticifolia (Kunth) Spreng.
  • Sabazia urticifolia (Kunth) DC.
  • Stemmatella urticifolia (Kunth) O.Hoffm. ex Hieron.
  • Vargasia caracasana DC.
  • Wiborgia brachystephana Heynh.
  • Wilborgia urticifolia Kunth
Other Common Names:
  • Common Quickweed
  • Fringed Quickweed
  • Hairy Galinsoga
  • Peruvian Daisy
  • Shaggy Soldier
Comment:
The genus Galinsoga apparently was apparently misunderstood at some time in the past and became corrupted into the common name Gallant Soldiers. The tiny flower is UV-absorbing against much UV-lighter foliage.

Equipment [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor]

Visible Light [f/11 for 1/100" @ ISO-800 in Sunlight with Baader UVIR-Block Filter]
Attached Image: galinsogaCiliata_vis_sun_20130827holmdelPkHlmNJ_14699pn0101.jpg

Ultraviolet Light [f/8 for 1/2" @ ISO-1250 with SB-14 UV-modified Flash and BaaderU UV-Pass Filter]
I rarely use such high-ISO, but the plant was in deep shade.
The foliage is more UV-reflective than the very UV-dark little flower rays.
Attached Image: galinsogaCiliata_uvBaader_sb14_20130827holmdelPkHlmNJ_14706pn0101.jpg
Andrea G. Blum
Often found hanging out with flowers & bees.

#2 Andy Perrin

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Posted 16 April 2021 - 19:52

Pretty! Lovely flower.

#3 Stefano

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Posted 16 April 2021 - 19:54

It looks so cool in UV! I'm guessing the leaves are reflecting the UV-yellow sky in the photo.

#4 nfoto

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Posted 16 April 2021 - 20:27

An inconspicuous species that has become near cosmopolitean in distribution. We saw it "invading" (which, strictly, is not the apt descriptor for this harmless little creature) northern Europe through ballast dumping by tall ships in the 1800's. All the endearing old seaside ports and tiny cities along the southern coastline have it as a characteristic element on any open patch of earth. Its close relative, Galinsoga parviflora, led the first wave of invasion, but has become much rarer these days due to the competitive advantage of the bigger G. quadriradiata. "Big" of course being used in a relative sense as neither are tall.

#5 colinbm

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Posted 17 April 2021 - 01:43

Nice flower Andrea, how small are they please ?

#6 Andrea B.

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Posted 17 April 2021 - 22:00

Thanks, all.

This particular species is native to Mexico. Interestingly, we don't seem to have it in New Mexico.

Col, the yellow center disc is about 5 mm in diameter. The petals thus are probably about 4 mm in length. I've seem smaller petals on plants in other location.
Andrea G. Blum
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#7 colinbm

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Posted 18 April 2021 - 01:16

Thanks Andrea, so about 15mm diameter.