Coreopsis lanceolata [Lanceleaf Coreopsis]

[dancingcat]

Frary, S.C. (2022) Coreopsis lanceolata L. (Asteraceae) Lanceleaf Coreopsis Photographed in ultraviolet and visible light.

 

Collected: 12 June 2022, open field, Waxahachie TX, USA.  Voucher deposition: Botanical Research Institute of Texas Herbarium (BRIT), S. C. Frary [151].

 

Other Common Names:  Lance-leaved Coreopsis, Lanceleaf Tickseed, Sand Coreopsis

 

Synonyms: Coreopsis crassifolia, C. heterogyna, C. lanceolata var. villosa

 

Comment:  UV seems similar to C. tinctoria and C. californica here.  Ray petals strongly UV absorbtive with UV reflective anthers and pollen.  The plant is drought and heat tolerant and is native to the southeast US, west to Texas and New Mexico.  It is naturalized throughout the US and Canada.  The common name “Tickseed” comes from the seeds resembling ticks.
 
References:
1. George M. Diggs Jr., Barney L. Lipscomb, Robert J. O'Kennon (1999) Shinners and Mahler's Illustrated Flora of North Central Texas. Coreoposis lanceloata page 342. Published by Botanical Research Institute of Texas, Fort Worth. Online in PDF format at Illustrated Flora of North Texas Online.
2. Lady Bird Johnson Wildflower Center Database, University of Texas at Austin.

 
Equipment: [Olympus EM-1mk2-broadband + Olympus 30mm f/3.5 macro]
 
Visible Light: [f/11, iso 640, 0.6”, Kolari UV/IR Cut HotMirror Pro 2 filter, ambient indoor room light. Zerene 15-image stack.  The whole plant image is f/8, iso 640, ⅓”, no stack]

 

Ultraviolet Light: [f/11, iso 640, 25”, BaaderU filter, Adaptalux 2x UV LED.]  

 

[colinbm]

Beautiful dancingcat.
The black specks in visible light don't show in UV, or is this a different flower head ?

[dancingcat]

@colinbm I think I used a different head for the above UV, but here are two test shots where I know it was the same flower.  I'm not sure if the black specs in the visible are "tickseeds" or just random field stuff (I didn't try to blow the head clean before I shot it).  But some of the dark specs show UV bright, and some don't.  So maybe whatever the specks are are sensitive to lighting angle in UV... maybe.

 

[colinbm]

Thanks dancingcat