Trifolium arvense [Rabbit's-foot Clover]

[Andrea B.]

Blum, A.G. 2013. Trifolium arvense L. (Fabaceae). Rabbit-foot Clover. Flowers photographed in ultraviolet, infrared and visible light. Composite multispectral stacks also presented. http://www.ultraviol...ts-foot-clover/

^{Updated: 10 Jan 2018. Set 2 is in next post.}

 

Comment:

The soft pink Rabbit's Feet flowers give some roadsides a delightfully furry look when at peak bloom on Mount Desert Island. This species is non-native to the US.

Like others in the Trifolium genus, the T. arvense flower is UV-absorbing.

 

Reference:

1. Mittelhauser et al. (2010) Rabbit-foot Clover, page 190. The Plants of Acadia National Park. The U. of Maine Press, Orono, ME.

2. Newcomb, L. (1977) Rabbit-foot Clover, page 60. Newcomb's Wildflower Guide. Little, Brown & Co., New York City, NY.


 

Set 1

Southwest Harbor, Maine, USA

20 July 2012

Wildflower

 

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

 

Visible Light [f/11 for 1/6" @ ISO 200 with onboard Flash and Baader UVIR-Block Filter]

 

Ultraviolet Light [f/11 for 8" @ ISO 200 in Sunlight with Baader UV-Pass Filter]

 

Infrared Light [f/11 for 1/4" @ ISO 200 with onboard Flash and B+W 092 IR-Pass Filter]

[Andrea B.]

Set 2

Southwest Harbor, Maine, USA

15 July 2008

Wildflower

 

Equipment [Nikon D200-broadband + UV-Nikkor 105/4.5]

 

Visible Light [f/11 for 1/180" @ ISO 400 in Sunlight with Baader UVIR-Block Filter]

 

Ultraviolet Light [f/11 for 2" @ ISO 400 in Sunlight with Baader UV-Pass Filter]

^{Eleven years later in 2018, I probably would render this image differently than I did back in 07. "-) See last image.}

 

Infrared Light [f/11 for 1/60" @ ISO 200 in Sunlight with B+W 093 IR-Pass Filter]

 

Composite [UV, Visible and Infrared Difference Layers]

 

Composite [Infrared Luminosity Layer over Visible Photo]

 

Composite [Ultraviolet Luminosity Layer over Visible Photo]

 

Composite [Channel Stack: Rir + Gvis + Buv]

^{The Infrared image was assigned to the Red channel; the Visible image to the Green channel; and the UV image to the Blue channel.}

 

Composite [Channel Stack: Rir + Gvis + Bvis]

^{An IR and Visible mix. The IR image was assigned to the Red channel. The Visible image was placed into both the Green and the Blue channels.}

 

Composite [Channel Stack: Rvis + Gvis + Buv]

^{A UV and Visible mix. The UV image was assigned to the Blue channel. The Visible image was placed into both the Red and the Green channels.}

 

 

**************

 

Here is a rework of the UV image using Photo Ninja.

Ultraviolet Light [f/11 for 2" @ ISO 400 in Sunlight with Baader UV-Pass Filter]

^{I like the improved false colour rendition shown here, but the shadow lift is not so pleasing. That old D200 was quite noisy at ISO400, wasn't it?}

[Hornblende]

What an odd flower for a Trifolium, it doesn't look like any other Fabaceae.

I really like those composite images, the problem is that there is so much combinations I don't know where to stop when I play with my UV, VIS and IR pictures in photoshop.

[Andrea B.]

The actual flowers on the capitulum are so tiny that they are difficult to see in these photos. If viewed very closely, they do look like tiny elongated Fabaceae flowers. You can see them best in the Visible and IR views.

 

Agreed about all the possible combos. And many of them are not particularly interesting. So I simply pick the combo which appeals to me because it is false-colourful or unusual in some way.

 

Here is a better view of the T. arvense capitulum. At the bottom the flowers are a bit dried out and have yellowed. Near the top they are newer and white. You can just barely see the typical upper & lower lip as have the typical Fabaceae flowers.

This photo was made with the Micro-Nikkor 60/2.8 on my old D3S. Geez that camera was wonderful. I still miss it.

 

[Bill De Jager]

Amazing inflorescence and very nice work!

[Cadmium]

Andrea, Attractive shots and composites.

My personal favorite of all of them, Composite [Channel Stack: Rir + Gvis + Buv].

Yep, 2012, those rock. All are quite nice.