Engelmannia peristenia [Engelmann's Daisy]

[dancingcat]

Frary, S.C. (2022) Engelmannia peristenia (Raf.) Goodman & C.A. Lawson. (Asteraceae) Engelmann’s Daisy.  Photographed in ultraviolet and visible light.

 

Collected 6 June 2022 on roadside in Waxahachie Texas USA.  Voucher deposition: Botanical Research Institute of Texas Herbarium (BRIT) S. C. Frary [150].

 

Other Common Names:  Cutleaf Daisy

 

Synonyms:  Engelmannia pinnatifida A. Gray ex Nutt.

 

Comment:  Native to the Great Plains of the United States and northern Mexico.  Heat and drought tolerant, a very tough perennial wildflower.  Commonly used in cultivated wildflower gardens.  This is a monotypic genus - this is the only species contained in it.  Named for George Engelmann, who collected and described a large number of western and southwestern United States plants in collaboration with Asa Gray at Harvard in the middle 1800’s.  His collections formed the basis of the Missouri Botanical Garden Herbarium in St. Louis.
 
Reference:
Lady Bird Johnson Wildflower Database, University of Texas at Austin. 

 
Equipment [Olympus EM1mk2-broadband + Olympus 30mm f/3.5 macro]

 

In-Situ [iPhone 13]

 
Visible Light [f/11, iso 200, 3.2”, Kolari Vision UV/IR Cut HotMirror Pro 2 filter, front of flower is 15-image in-camera stack processed by Helicon Focus C, back of flower is a single image]

 

Ultraviolet Light [f/11, iso 200, 10”, BaaderU filter, Adaptalux UV LED arm 2x, front of the flower is a 15-image in-camera stack processed by Helicon Focus C, back of the flower is a single image.]

 

[colinbm]

Beautiful, you have done this flower justice.

[dancingcat]

ty @colinbm   on this one I wonder why the flower’s UV dark substance follows the petal veins on the back, but not on the front.  Funky.

[colinbm]

One day, when we are dead & gone (unfortunately), science will have all the answers....?

[nfoto]

A similar behaviour regarding the UV dark venation on the rear side of the ligules is seen with many species in the Asteraceae.