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Xanthisma spinulosum [Spiny Goldenweed]

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#1 Andrea B.

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Posted 03 March 2021 - 20:49

Blum, A.G. (2021) Xanthisma spinulosum (Pursh) D.R. Morgan & R.L. Hartman (Asteraceae) [Spiny Goldenweed] Flowers photographed in ultraviolet and visible light. https://www.ultravio...eed/#entry43270

SET 1
Found along Rodeo Drive, Santa Fe, New Mexico, USA
24 Oct 2019
Wildflower

Other Common Names:
  • Cutleaf Goldenweed
  • Lacy Sleepy Daisy
  • Lacy Tansyaster
  • Wooly Goldenweed
  • Yellow Spiny Daisy
Synonyms:
  • Amellus spinulosus Pursh
  • Diplopappus pinnatifidus Hooker
  • Haplopappus spinulosus (Pursh) de Candolle
  • Machaeranthera pinnatifida (Hooker) Shinners
    This is the most recent previous name for X. spinulosum.
  • Many more synonyms are listed in the SEINet entry[4].
.
Comment:
The white bristle at the end of each leaf and phyllary gives the plant its genus name. Those bristles also help to identify the plant given that there tends to be some morphological variations in plant size, number of rays, ray length, hairiness and other features amongst the Xanthisma subspecies.

I have enjoyed seeing the X. spinulosum clear yellow stars on the roadsides in my area where the plant is very common. Like many UV-absorbing Asteraceae, this flower shows some iridescent striping along its rays.


References:

1. Allred, Kelly W., Jercinovic, Eugene M., Ivey, Robert DeWitt (2021) Flora Neomexicana III: An Illustrated Identification Manual, Second Edition, Part 2, Taxon Key, page nnn. Print on demand at lulu.com.
2. Finley, Willa F., Nieland, Lashara J. (2013) Land of Enchantment Wildflowers. Xanthisma spinulosum, page 83. Texas Tech University Press, Lubbock, Texas.
3. SEINet Arizona-New Mexico Chapter (acc nn mmm 2021) Xanthisma spinulosum.
This is a southwestern biodiversity organization making use of the Symbiota portal software.
4. Southwest Colorado Wildflowers (acc nn mmm 2021) Xanthisma spinulosum.
Website published and maintained by Al Schneider and hosted by Rocky Mountain Biological Laboratory.
5. Wildflowers of New Mexico (acc nn mmm 2021) Xanthisma spinulosum.
Website published and maintained by George Oxford Miller.


Equipment [Nikon D610-broadband + Nikon 105mm f/4.5 UV-Nikkor]

Visible Light [f/11 for 1/20" @ ISO-800 under Ambient Skylight with Baader UVIR-Block Filter]
I don't know why those petals are wrinkled. Maybe they did not completely unfold when blooming.
Attached Image: xanthismaSpinulosum_vis_ambient_20191024rodeoDrSantaFe_17568pnCropResize.jpg


Visible Light [f/11 for 1/8" @ ISO-800 in Sunlight with Baader UVIR-Block Filter]
Note the bristles at the tips of the pinnatifid leaves.
Attached Image: xanthismaSpinulosumStemLeaves_vis_ambient_20191024rodeoDrSantaFe_17600pn01resize.jpg


Ultraviolet Light [f/11 for 4" @ ISO-800 with SB-14 UV-modified Flash and BaaderU UV-Pass Filter]
The iridescent striping does not vary much by location on the rays (edges and along grooves),
but it does turn off/on depending on the angle of the UV illumination.
Attached Image: xanthismaSpinulosum_uvBaader_sb14_20191024rodeoDrSantaFe_17583pn.jpg


Visible Light [f/11 for 1/20" @ ISO-800 with Onboard Flash and Baader UVIR-Block Filter]
The pappi are about 4-6mm long and quite evident here.
Attached Image: xanthismaSpinulosumAbaxial_vis_flash_20191024rodeoDrSantaFe_17591pn.jpg


Ultraviolet Light [f/11 for 4" @ ISO-800 with SB-14 UV-modified Flash and BaaderU UV-Pass Filter]
The ray iridescence is more pronounced abaxially and not confined to striping.
Attached Image: xanthismaSpinulosumAbaxial_uvBaader_sb14_20191024rodeoDrSantaFe_17598pn.jpg


Ultraviolet Light [f/16 for 1.3" @ ISO-800 with SB-14 UV-modified Flash and BaaderU UV-Pass Filter]
These two flowers are from the same plant as the preceding example.
Attached Image: xanthismaSpinulosum_uvBaader_sb14_20191024rodeoDrSantaFe_1762801v2.jpg


SET 2
El Dorado at Santa Fe, Santa Fe, New Mexico, USA
Near Avenida El Dorado & Avenida Torreon
10 June 2020

Visible Light [f/8 for 1/500" @ ISO-125 with D850 + Micro-Nikkor 60/2.8G ED AFS]
A typical X. spinulosum along the roadside.
Attached Image: xanthismaSpinulosumHabit_20200610aveEldorAveTorreon_7258pn.jpg

Equipment [Nikon D610-broadband + Nikon 105mm f/4.5 UV-Nikkor]

Visible Light [f/16 for 1/2.5" @ ISO-200 with Onboard Flash and Baader UVIR-Block Filter]
Attached Image: xanthismaSpinulosum_vis_flash_20200610aveEldorAveTorreon_21103pnv201.jpg

Ultraviolet Light [f/16 for 20" @ ISO-200 with SB-14 UV-modified Flash and BaaderU UV-Pass Filter]
Two flashes were made in the 20" interval for better illumination.
Attached Image: xanthismaSpinulosum_uvBaad_sb14_20200610aveEldorAveTorreon_21108pnv201.jpg
Andrea G. Blum
Often found hanging out with flowers & bees.

#2 Andy Perrin

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Posted 03 March 2021 - 21:26

I like the colors on the UV here.

#3 Andrea B.

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Posted 03 March 2021 - 23:43

Me too. The false blue pollen is always nice in a dark flower. That first flower seemed newer than the last two, so I think that's why the blue is stronger in the first flower? Of course, there's always some variation in the conversions due to amount and angle of lighting.
Andrea G. Blum
Often found hanging out with flowers & bees.

#4 Andrea B.

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Posted 17 March 2021 - 23:58

Set 2
Andrea G. Blum
Often found hanging out with flowers & bees.

#5 Cadmium

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Posted 18 March 2021 - 01:09

Andrea, I like that visual group photo (#7), would like to see that one in UV+Blue+Green.

#6 Andrea B.

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Posted 18 March 2021 - 22:21

Thx. :smile:
I will try to make some UV+B+G photos this spring and summer.
Andrea G. Blum
Often found hanging out with flowers & bees.