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Helianthus maximiliani [Maximilian Sunflower]


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#1 msubees

    Zach Huang

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Posted 03 June 2015 - 20:33

Huang, Z.Y. (2015) Helianthus maximiliani Schrad. (Asteraceae) Maximilian Sunflower. Flowers photographed in ultraviolet, visible light and simulated insect vision. http://www.ultraviol...ower/#entry8677

Missoula, Montana, USA
16 Sept, 2014
Cultivar in University of Montana Botanical Garden.

Synonyms:
  • Helianthus dalyi
  • Helianthus maximilianii
Common Names:
  • Maximilian Sunflower
Comment:
Photographs taken in the order of visible light, ultraviolet, and simulated insect vision. The UV signature of this flower are very typical of the genus Helianthus, with the anterior part of ray flower petals as UV-yellow and interior half as UV-absorptive. Simulated insect vision shows the UV-dark areas as green.

Reference:
1. Wikipedia (23 May 2015) Helianthus maximiliani. Wikimedia Foundation, San Francisco, CA.

Equipment [Panasonic DMC-G5-broadband + El Nikkor 80mm f/4.5 old format]

1. Visible Light [f/8 for 1/50" @ISO160, S8612 (1.75 mm thick), natural light]
Posted Image

2. Ultraviolet Light [f/8 for 15" @ISO160, S8612 (1.75 mm thick) and UG 11 (1 mm thick), natural light]
Posted Image

3. Simulated Insect Vision [f/8 for 3.2" @ISO160, S8612 (1.75 mm thick) and UG 5 (1.5 mm thick), natural light]

Posted Image

Edited by msubees, 05 June 2015 - 19:33.


#2 Andrea B.

    Desert Dancer

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Posted 04 June 2015 - 17:05

Nice work, Zach. I've been trying to find one of these guys to photograph myself. :(

One small correction: In genus Helianthus the disc flowers are bisexual. So these are not male flowers. The Flora of North America is a good reference for this kind of thing: http://www.efloras.o...taxon_id=114871

I took the liberty as spelling editor to replace MT with 'Montana, USA'. This is because we are an international forum and I don't think everyone knows the US abbreviations.
Andrea G. Blum
Often found hanging out with flowers & bees.

#3 msubees

    Zach Huang

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Posted 05 June 2015 - 02:22

Sorry, bad copying from the last post which had male and female flowers. these small ray flowers should be complete.

not sure if my white balance was messed up for UV because there is no UV yellow for the anterior tip of "petals".

View PostAndrea B., on 04 June 2015 - 17:05, said:

Nice work, Zach. I've been trying to find one of these guys to photograph myself. :(

One small correction: In genus Helianthus the disc flowers are bisexual. So these are not male flowers. The Flora of North America is a good reference for this kind of thing: http://www.efloras.o...taxon_id=114871

I took the liberty as spelling editor to replace MT with 'Montana, USA'. This is because we are an international forum and I don't think everyone knows the US abbreviations.


#4 Andrea B.

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Posted 05 June 2015 - 13:06

Yes, the white balance is a bit off. There is too much red & cyan. Eventually you can correct it in the converter/editor.
Andrea G. Blum
Often found hanging out with flowers & bees.

#5 msubees

    Zach Huang

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Posted 10 June 2015 - 15:05

This is from in camera white balance with a virgin teflon. I could not bring any yellow out, if the petals are yellow, then all the background are also yellow. Maybe this is what it is for the flower in terms of UV...pretty much like a monochrome.

View PostAndrea B., on 05 June 2015 - 13:06, said:

Yes, the white balance is a bit off. There is too much red & cyan. Eventually you can correct it in the converter/editor.