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Penstemon digitalis [Foxglove Beardtongue]

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#1 Andrea B.

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Posted 03 September 2018 - 02:19

Blum, A.G. (2018) Penstemon digitalis Nutt. ex Sims (Plantaginaceae) Foxglove Beardtongue. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...ve-beardtongue/

Middletown, New Jersey, USA
08 June 2018
Wildflower in home garden

Synonyms:
  • Penstemon bradurii Pursh

Comment:
This Canadian and Eastern US native perennial can reach a height of 4 feet or more when established. The white flower has 4 fertile stamens and one hairy infertile stamen giving rise to the 'beardtongue' designation. The calyx, flower tube and stems are covered in glandular hairs.

This particular plant was gathered from a cow pasture about to be bulldozed for building new homes. After transplanting to my garden, the next year it thrived and produced about 3.5 feet of growth with several panicles full of bloom.

In ultraviolet light, the tubular throat of the flower is UV-absorbing while the outer corolla and outer tube are UV-reflecting. The stems are strikingly UV-black. Both stems and flowers show some iridescence.

Reference:
1. New England Wild Flower Society (2018) Nutt. ex Simms. Foxglove Beardtongue.
https://gobotany.new...emon/digitalis/


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

Visible Light [f/16 for 6" @ ISO-100 in Sunlight with Baader UVIR-Block Filter]
Attached Image: penstemonDigitalis_vis_ambient_20180608wf_10327pn.jpg

Visible Light [f/4.5 for 1/2.5" @ ISO-400 in Sunlight with Baader UVIR-Block Filter]
Multiple images were stacked for improved depth of field.
Attached Image: penstemonDigitalis_vis_ambient_20180608wf_10311pnStackV2.jpg

Ultraviolet Light [f/4.5 for 4" @ ISO-200 with SB-14 UV-modified Flash and BaaderU UV-Pass Filter]
Attached Image: penstemonDigitalis_uvBaader_sb14_20180608wf_10269pn02.jpg

Ultraviolet Light [f/4.5 for 4" @ ISO-200 with SB-14 UV-modified Flash and BaaderU UV-Pass Filter]
Multiple images were stacked for improved depth of field.
Attached Image: penstemonDigitalis_uvBaader_sb14_20180608wf_10317-21stack.jpg
Andrea G. Blum
Often found hanging out with flowers & bees.

#2 Andy Perrin

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Posted 03 September 2018 - 02:25

Argh. The loss of open land is horrifying and drives me a little nuts. People and animals need green space.

I meant to say it’s a gorgeous flower also but got distracted. It seems very different from the usual foxgloves.

Edited by Andy Perrin, 03 September 2018 - 02:27.