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Polemonium acutiflorum [Tall Jacob's Ladder]


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#1 nfoto

    Former Fierce Bear of the North

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Posted 27 July 2013 - 06:37

Rørslett, B. 2013. Polemonium acutiflorum Willd. (Polemoniaceae). Tall Jacob's Ladder. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...-jacobs-ladder/

Polemonium acutiflorum Willd.
NO: Lappflokk
SE: Lappblågull
DK: Spidsblomstret Jakobsstige
FI: Kellosinilatva
EN: Tall Jacob's Ladder

This is a medium tall perennial species of damp meadows, native to northern Europe and North America. It also sees use as an ornamental plant. Its external appearance is akin to the more common P. caeruleum, from which P. acutiflorum differs by having darker coloured flowers with more pointed petals which are hairy along the edges, and pinnate leaves with fewer leaflet pairs (typically 6 against 8-12 for P. caeruleum). They do hybridise to make the matters more complicated.

Plants photographed at Hamningsberg, Finnmark Norway 23 Jul 2013.

Attached Image: POLE_ACU_B1307237525_VIS.jpg
Image reference: POLE_ACU_B1307237525_VIS.jpg
Visible light: Nikon D800, Voigtländer 125 mm f/2.5 APO-Lanthar

Attached Image: POLE_ACU_I1307230969_UV.jpg
Image reference: POLE_ACU_I1307230969_UV.jpg
Ultraviolet light: Panasonic GH-2, Coastal Optics 60 mm f/4 APO lens, Baader U2" (Venus) filter, SB-140 flash.

The corolla of P. acutiflorum is covered with conical cells giving the flower a shimmering appearance in UV.

References:
http://www.ultraviol...-r%C3%B8rslett/

[Published 31 Jul 2013]