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Phacelia crenulata [Notch-leaved Phacelia]


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#1 Andrea B.

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Posted 26 June 2013 - 20:24

Blum, A.G. (2013, 2016) Phacelia crenulata Torrey ex S.Watson (Boraginaceae) Notch-leaved Phacelia. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...eaved-phacelia/

Synonyms:
  • Notchleaf Heliotrope
  • Cleftleaf Wild Heliotrope
Comment:
The flower and leaves of P. crenulata are moderately UV-reflective. The filaments are UV-dark when the flower has first opened, but seem to brighten somewhat in older flowers. There are 5 UV-bright patches forming a star shape in the base of the flower.
This Phacelia is native to the US southwest and northern Mexico. It can cause contact dermatitis in suseptible individuals.

There are two varieties of P. crenulata in the Death Valley and Mohave areas: P. crenulata var. ambigua and P. crenulata var. crenulata, but I'm not going to attempt that ID until I know the Phacelias better. And, there are some other Phacelia species quite similar to the P. crenulata shown here. The ID of my examples shown below is subject to revision, suffice it to say. "-)


Reference:
1. Jepson eFlora (2013) P. crenulata S.Watson. Jepson Herbarium, U. of California-Berkeley, Berkeley, CA. http://ucjeps.berkel...JM.pl?tid=37441

SET 1
Death Valley National Park, California, USA
29 February 2012
Wildflower

Equipment:
[Nikon D300-broadband + Nikon 105mm f/4.5 UV-Nikkor]

Visible Light [f/4 for 1/8000” @ ISO 200 with Nikon D3S]
Attached Image: phaceliaCrenulataVisSun02292012furnaceCreekDvNpCA_34297origProofPn.jpg

Visible Light [f/8 for 1/130” @ ISO 200 in Sunlight with Baader UVIR-Block Filter]
Attached Image: phaceliaCrenulataVisSun022912deathValleyNpCA_22010origProofPn01.jpg

Ultraviolet Light [f/11 for 1/250” @ ISO 800 with SB-14 UV-modified Flash and Baader UV-Pass Filter]
Attached Image: phaceliaCrenulataUVBaadSB14_022912deathValleyNpCA_22091origProofPn01.jpg

Ultraviolet Light [f/8 for 1/250” @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]
Attached Image: phaceliaCrenulataUVBaadSB14_022912deathValleyNpCA_22016origProofPn.jpg

SET 2
Mohave National Preserve, San Bernardino County, California, USA
03 March 2012
Wildflower

Equipment [Nikon D300-broadband + Carl Zeiss 60mm f/4.0 UV-Planar]

Visible Light [f/8 for 1/4000” @ ISO 800 in Sunlight with Baader UVIR-Block Filter]
Attached Image: phaceliaCrenulataVisSun030312mohaveNpCA_22619proofPnCrop.jpg

Ultraviolet Light [f/8 for 1/250” @ ISO 800 with SB-14 UV-modified Flash and Baader UV-Pass Filter]
Attached Image: phaceliaCrenulataUVBaadSB14_030312mohaveNpCA_22625proofPnCrop.jpg


[Last Update: 13 June 2016]
Andrea G. Blum
Often found hanging out with flowers & bees.

#2 Andrea B.

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Posted 13 June 2016 - 14:38

SET 3
Death Valley National Park, California, USA
02 February 2016
Wildflower

Comment: This was a year for an amazing spring super-bloom in Death Valley because the rains fell in the right amounts at the right times during the fall and winter. There was an amazing abundance of flowers. The first two photos below show the surface cracks in the desert floor after it dried out from a recent rain. The Phacelia and other flowers then sprout up through the cracks and burst into bloom.

These photos may be clicked up to 1000 px wide in an expanded browser.

Visible Light [Nikon D750 + Coastal Optics 60mm f/4.0 UV-Vis-IR APO in Sunlight]
f/6.3 for 1/100" @ ISO-400 & EV+0.3
A Ghost Flower rosette and some Brown-eyed Evening Primrose can also be seen.
Attached Image: phaceliaCrenulata_visSun_20160217deathValleyNatParkCA_41404pn.jpg


Visible Light [Nikon D600-broadband + Coastal Optics 60mm f/4.0 UV-Vis-IR APO in Sunlight with Baader UVIR-Block Filter]
f/8 for 1/60" @ ISO-800
Attached Image: phaceliaCrenulata_visSun_20160217deathValleyNatParkCA_43315pn.jpg


Visible Light [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor with Onboard Flash and Baader UVIR-Block Filter]
f/8 for 1/200" @ ISO-400
Leaf detail. Some P. Crenulata have rounded leaf lobes and some have more pointed leaf lobes.
Attached Image: phaceliaCrenulataLeaf_visFlash_20160217deathValleyNatParkCA_43309pn.jpg


Visible Light [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor with Onboard Flash and Baader UVIR-Block Filter]
f/11 for 1/200" @ ISO-100
This is a composite stack of 4 frames made for increased depth-of-field.
Attached Image: phaceliaCrenulata_visFlash_20160217deathValleyNatParkCA_43278pnComposite01.jpg


Ultraviolet Light [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor with SB-14 UV-modified Flash and BaaderU UV-Pass Filter]
f/11 for 1/80" @ ISO-400
There are 5 UV-bright points in the throat of the flower and a faint UV-dark ring around the throat.
Attached Image: phaceliaCrenulata_uvBaadSB14_20160217deathValleyNatParkCA_43292pn01.jpg
Andrea G. Blum
Often found hanging out with flowers & bees.

#3 colinbm

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Posted 13 June 2016 - 22:47

Brilliant work Andrea, some lovely photography.
Col