• Ultraviolet Photography

Catalpa speciosa [Northern Catalpa]

Fluorescence Infrared Multispectral
2 replies to this topic

#1 Mark


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Posted 01 July 2019 - 00:07

Duda, M. (2019) Catalpa speciosa (Warder) Warder ex Engelm. (Bignoniaceae) Northern Catalpa. Flower photographs of reflected ultraviolet, visible, ultraviolet induced visible fluorescence, reflected infrared, ultraviolet induced infrared fluorescence, and cyan induced infrared fluorescence. (link to this post: https://www.ultravio...rthern-catalpa/)

Andover, Massachusetts, USA
2019.June.28, public cultivar

Pollinators: Bees, hummingbirds.

Comment: This specimen was taken from a tree in a public space, and photographed within one hour.

1. Native Plant Trust (2019) Catalpa speciosa (Warder) Warder ex Engelm.: https://gobotany.nat...talpa/speciosa/

2. Wikipedia (29 August 2018, at 13:59 UTC) Catalpa speciosa: https://en.wikipedia...atalpa_speciosa

Nikon D750 (modified) + Nikon 50 mm Series E + 12 mm extension tube
Illuminant, excitation, and barriers vary as listed below.

Visible: f /11, 0.5'', ISO320; source: EF-500 DG flash; S8612 + 420 nm long pass lens filters
Attached Image: 2019-06-28_14-56-06_flash--s8612-420lp.jpg

Ultraviolet: f /11, 8.0'', ISO320; source: MTE-U303 + U340 filter; Asahi 0340 lens filter
Attached Image: 2019-06-28_14-53-54_mte-u340--0340.jpg

Ultraviolet induced visible fluorescence: f /11, 15'', ISO320; source: MTE-U303 + U340 filter; Baader UV/IR cut + KV418 lens filters
Attached Image: 2019-06-28_14-57-07_mte-u340--baader-kv418.jpg

Reflected infrared: f /11, 1.0'', ISO320; source: 40W clear glass incandescent bulb; R72 + YK2 lens filters
Attached Image: 2019-06-28_15-02-40_incan--r72-yk2.jpg

Ultraviolet induced infrared fluorescence: f /11, 20'', ISO320; source: S2+ + U340 + KVHM filters; R72 + YK2 lens filters
Attached Image: 2019-06-28_15-05-57_s2-u340-kvhm--r72-yk2.jpg

Cyan induced infrared fluorescence: f /11, 15'', ISO320; source: cyan LED + BG39 filter, R72 + YK2 lens filters
Attached Image: 2019-06-28_15-08-26_cyan--r72-yk2.jpg

MD, 2019.June.30, 00:08 UTC

Edited by Mark, 01 July 2019 - 00:16.

#2 Andy Perrin


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Posted 01 July 2019 - 00:09

Love the IR(!) and the UVIVF and CIIF pics especially.

Edited by Andy Perrin, 01 July 2019 - 00:10.

#3 Andrea B.

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Posted 02 July 2019 - 17:55

Diurnal and Nocturnal Pollination of Catalpa speciosa (Bignoniaceae)
by Stephenson & Thomas in Systematic Botany, Autumn, 1977

On the way up to Maine from New Jersey we passed numerous blooming Catalpa trees. I didn't know what they were as I was seeing them from a distance, but was able to make note of leaf shape for later ID. Anyway, seeing Mark's cool series on the Catalpa blossom, I was curious about what pollinates this tree. The referenced paper offers this: Catalpa speciosa is an obligate outcrosser pollinated diurnally by bumblebees and carpenter bees and nocturnally by various moths.

There are two species of Catalpas which grow in the US: C. speciosa (Northern Catalpa) and C. bignonioides (Southern Catalpa), but the tree is planted ornamentally so it is difficult to know whether those seen are wild or not. Anyway, it is reasonable to think that both types and any ornamentals have the same set of primary pollinators.
Andrea G. Blum
Often found hanging out with flowers & bees.