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[Andrea B.]

Blum, A.G. (2013) Phlox longifolia Nuttall (Polemoniaceae) Longleaf Phlox. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...longleaf-phlox/

Mesa Verde National Park, Montezuma County, Colorado, USA
02 May 2013
Wildflower
Lat [N37°20'15.2"] Lon [W108°24'33.3"] Alt[approx2108]

Comment:
Key to identification of P. longifolia in southwestern Colorado it the white calyx membrane which forms a ridged or "keeled" appearance between the calyx lobes.
The small white area at the base of each petal becomes UV-dark, while the moderately UV-absorbing corolla shows some very narrow UV-dark striations.

Reference:
1. Lady Bird Johnson Wildflower Center (2013) Phlox longifolia. U. of Texas at Austin, Austin, TX. http://www.wildflowe...?id_plant=PHLO2

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

Visible Light [f/8 for 1/2500” @ ISO 400 in Sunlight with Baader UVIR-Block Filter]


Visible Light [f/7.1 for 1/1000” @ ISO 200 with Nikon Coolpix A]
Note white membrane between calyx lobes.


Ultraviolet Light [f/8 for 1/160” @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]


Ultraviolet Light [f/8 for 1/200” @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]
Step back from the screen for best effect.