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Commelina communis [Asiatic Dayflower]


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#1 Andrea B.

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Posted 06 August 2013 - 15:59

Blum, A.G. (2013) Commelina communis L. (Commelinaceae) Asiatic Dayflower. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...atic-dayflower/

Middletown, New Jersey, USA
04 August 2013
Wildflower

Synonyms:
  • tsuyukusa ( tsuyukusa): Japanese meaning 'dew herb'
Comment:
I have a fondness for blue flowers even if they are introduced non-native noxious weeds. The pretty flowers which emerge from the green spathe envelope last only a day.
There is an interesting orchid-like mottled pattern seen on the UV-dark staminodes and stamen in UV. The rest of the flower is moderately UV-reflecting. The lower petal seems a bit brighter than the two top petals. (Don't confuse the lower petal with the spathe bracts.)

Reference:
In a departure from my normal practice, I'm going to go with Wikipedia on the reference for this wildflower. Their description of C. communis is one the most complete botanical write-ups I've ever seen.
1. Wikipedia (2013) Commelina communis http://en.wikipedia....melina_communis

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

Visible Light [f/11 for 1/30" @ ISO 100 with onboard Flash and Baader UVIR-Block Filter]
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Attached Image: commelinaCommunisVisFlash_080613wf_13542PNcrop.jpg

Ultraviolet Light [f/11 for 1/200" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]
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Attached Image: commelinaCommunisUVBaadSB14_080613wf_13557PNcrop.jpg
Andrea G. Blum
Often found hanging out with flowers & bees.