Trifolium hybridum [Alsike Clover]

[Andrea B.]

Blum, A. G. (2014) Trifolium hybridum L. (Fabaceae) Alsike Clover. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...-alsike-clover/

 

Synonyms:

• Alsatian Clover
  
• Trifolium elegans Savi
  
• Trifolium hybridum ssp. elegans (Savi) Aschers. & Graebn.
  
• Trifolium hybridum var. elegans (Savi) Boiss.
  
• Trifolium hybridum var. pratense Rabenh.
  

Comment:

A key point of differentiation between T. hybridum and its creeping cousin T. repens is that T. hypridum's stipules have free tips and its leaves have no lighter markings on the top surface.

Like Red Clover and White Clover, in Ultraviolet light Alsike Clover is primarily UV-dark with some patches of reflectivity on the floret banner due to the angle of the light.

 

Reference:

1. New England Wild Flower Society (2014) Trifolium hybridum L. Alsike Clover. https://gobotany.new...olium/hybridum/

2. Mittelhauser et al. (2010) The Plants of Acadia National Park. Alsike Colver, page 191. The U. of Maine Press, Orono, ME.

 

Set 1

Southwest Harbor, Maine, USA

08 July 2014

Wildflower

 

Equipment [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor]

 

Visible Light [f/4.5 for 1.3" @ ISO 100 with onboard Flash and Baader UVIR-Block Filter]

 

Ultraviolet Light [f/16 for 20" @ ISO 100 with SB-14 UV-modified Flash and Baader UV-Pass Filter]

A long exposure was taken so that the UV flash could be fired 3 times for even lighting.

 

Visible Light [f/11 for 2.5" @ ISO 100 with onboard Flash and Baader UVIR-Block Filter]

Unmarked leaf and free-tipped stipule.

 

Visible Light [f/9 for 1/800 @ ISO 400 with Nikon Df + 60/f2.8G AFS Micro-Nikkor]

A patch of Alsike Clover in a Maine meadow.

 

Set 2

Southwest Harbor, Maine, USA

13 July 2007

Wildflower

 

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

 

Visible Light [f/16 for 1/125" @ ISO 280 in Sunlight with Baader UVIR-Block Filter]

 

Ultraviolet Light [f/16 for 1.5" @ ISO 280 in Sunlight with Baader UV-Pass Filter]

[Andrea B.]

Set 3

Shore Cottage, Southwest Harbor, Maine, USA

01 August 2015

Wildflower

 

Equipment [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor]

 

f/11 for 1/8" @ ISO-800

UG-5 (1.50mm) + S8612 (1.75mm) Filter Stack

Sun

 

 

f/16 for 1/13" @ ISO-200

B+W 093 IR-Pass Filter

Sun

 

 

f/11 for 1/250" @ ISO-200

Baader UV/IR-Cut Filter + SB-14 + Sun

 

 

f/11 for 8" @ ISO-200

BaaderU UV-Pass Filter

Sun

 

 

f/11 for 3" @ ISO-400

CopperU UV-Pass Filter

Sun