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UltravioletPhotography

Calylophus hartwegii [Hartweg's Sundrops]


Andrea B.

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Blum, A.G. (2021) Calylophus hartwegii (Benth.) Raven (Onagraceae) Hartweg's Sundrops. Flowers photographed in ultraviolet, infrared, visible and mixed light. https://www.ultravio...twegs-sundrops/

 

El Dorado at Santa Fe, Santa Fe, New Mexico, USA

23 May 2020

Wildflower

 

Synonyms:

  • Oenothera hartwegii

Other Common Names:

  • Yellow Evening Primrose

.

Comment:

Because the fading flowers change color from bright yellow to shades of rose, salmon and orange, seeing the Hartweg's Sundrops plant on the side of a dusty road is a colorful treat. The flowers are all a bit floppy even when just opened.

 

Two key points of identification are the red-spotted sepals (photo #2 below) and the long tapering hypanthium under the sepals (photos #8 and #9 below).

 

Like other Sundrops, Hartweg's has an irregular UV-dark bull's-eye and throat with UV-black stamens and stigma. The hypanthium shows some strong false blue. There is UV-dark veining on both sides of the corolla.

 

 

References:

1. SEINet Arizona-New Mexico Chapter (acc 22 Mar 2021) Calylophus hartwegii.

This is a southwestern biodiversity organization making use of the Symbiota portal software.

2. Wildflowers of New Mexico (acc 22 Mar 2021) Calylophus hartwegii.

Website published and maintained by George Oxford Miller.

3. Allred, Kelly W., Jercinovic, Eugene M., Ivey, Robert DeWitt (2021) Flora Neomexicana III: An Illustrated Identification Manual, Second Edition, Part 2, Oenothera Key, page 574. Print on demand at lulu.com.

Note: FN III subsumes Calylophus, Gaura and Stenosiphon into Oenothera.

4. Finley, Willa F., Nieland, Lashara J. (2013) Land of Enchantment Wildflowers. Calylophus hartwegii, page 111. Texas Tech University Press, Lubbock, Texas.

5. Littlefield, Larry J., Burns, Pearl M. (2015) Wildflowers of the Northern and Central Mountains of New Mexico. Hartweg's Sundrops, page 181. University of New Mexico Press, Albuquerque, New Mexico.

 

 

 

Visible Light [f/11 for 1/320" @ ISO-220 in Sunlight with D850 + Micro-Nikkor 60/2.8G AFS]

A plant of many colors.

calylophusHartwegii_vis_sun_20200522aveTorreon_6907pn.jpg

 

 

Visible Detail

Note the red-spotted sepals of the flower bud.

calylophusHartwegii_vis_sun_20200522aveTorreon_691601.jpg

 

 

Visible Light [f/11 for 1/320" @ ISO-140 in Sunlight with D850 + Micro-Nikkor 60/2.8G AFS]

The bright yellow flower is lovely against the sunset tints of the fading flowers.

calylophusHartwegii_vis_sun_20200522aveTorreon_6912.jpg

 

 

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

 

Click any photo to enlarge it.

 

Visible Light [f/8 for 1/1000" @ ISO-200 in Sunlight with Baader UV/IR-Cut Filter]

Sundrops have an entire stigma unlike their Evening Primrose cousins whose stigma is lobed.

calylophusHartwegii_vis_sun_20200523aveTorreon_19503_05pnStack01.jpg

 

 

Infrared Light [f/8 for 1/1000" @ ISO-400 in Sunlight with RG780 IR-Pass Filter]

calylophusHartwegii_rg780_sun_20200523aveTorreon_19552pn01.jpg

 

 

Ultraviolet Light [f/8 for 1/250" @ ISO-800 in Sunlight & SB-14 Fill Flash with Baader UV/IR-Cut Filter]

calylophusHartwegii_uvBaad_sb14_20200523aveTorreon_19539pn01Stack.jpg

 

 

UV+Blue+Green [f/8 for 1/20" @ ISO-800 in Sunlight with U330 (2.0 mm) + S8612 (2.0 mm)]

calylophusHartwegii_u330x2_s8612x2_sun_20200523aveTorreon_19543pnStack01.jpg

 

 

Visible Light [f/8 for 1/1000" @ ISO-200 in Sunlight with Baader UV/IR-Cut Filter]

Note the long tapering hypanthium and, again, the red-spotted sepals.

calylophusHartwegiiAbaxial_vis_sun_20200523aveTorreon_19563pn01.jpg

 

 

Ultraviolet Light [f/8 for 1/20" @ ISO-800 in Sunlight with Baader UV/IR-Cut Filter]

The hypanthium shows some false blue.

calylophusHartwegiiAbaxial_uvBaad_sun_20200523aveTorreon_19569pn01.jpg

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Yes, the pollen laden anthers supported in the middle by their filaments are like some lilies.

The filaments on this Sundrop seem to be attached around the edge of the throat.

On lilies the filaments extend from inside the throat.

 

But the typical lily stigma is not like this squarish plump stigma which seems very unusual to me

hanging off to the side of the flower. :cool:

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