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Lepidium draba [Whitetop]


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#1 Andrea B.

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Posted 28 June 2013 - 21:46

Blum, A.G. (2013) Lepidium draba L. (Brassicaceae) Whitetop. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...draba-whitetop/

Durango, La Plata County, Colorado, USA
03 May 2013
Wildflower

Synonyms:
  • Cardaria draba (L.) Desvaux
  • Hoary Cress
Comment:
A particularly invasive weed, L. draba easily invades grassy, disturbed areas and takes over as it did here on a poorly maintained plot in a shopping area. It has an intricate, typically brassica-like little flower with the six stamens, stigma and four sepals forming an interesting center geometry accented by the 4 white spreading petals. In UV there is some patchy reflectivity on the bud tips and petals. On the inner base of the sepals, petals and filaments there are UV-white markings. The remaining portions of the filaments are UV-dark.

Reference:
1. Weber & Wittmann (2012) Cardaria Desvaux, page 126. Colorado Flora: Western Slope, 4th Ed. The U. of Colo. Press, Boulder, CO.

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

Visible Light [f/5 for 1/2000” @ ISO 200 with Nikon Coolpix A]
Attached Image: lepidiumDrabaVisSun_050313durangoCO_1257pfPn.jpg

Visible Light [f/11 for 1/500” @ ISO 400 in Sunlight with Baader UVIR-Block Filter]
Attached Image: lepidiumDrabaVisSun_050413durangoCO_10918pfPnCrop.jpg

Ultraviolet Light [f/11 for 1/200” @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]
Attached Image: lepidiumDrabaUVBaadSB14_050413durangoCO_10925pfPnCrop2.jpg
Andrea G. Blum
Often found hanging out with flowers & bees.