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Hypocalymma angustifolium x robustum

Fluorescence
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#1 DaveO

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Posted 26 July 2015 - 05:09

Oldfield, D. 2015. Hypocalymma angustifolium (Endl.) Schauer x robustum (Endl.) Lindl. (Myrtaceae) Flowers photographed in visible and ultraviolet light. http://www.ultraviol...ium-x-robustum/

Maldon, Victoria, Australia
29 June 2015
Australian Native Wildflower as Garden Specimen

Comment
This plant was bought recently from a local nursery but the existence of hybrids was not mentioned in Elliott & Jones. The paper by Rye et al. however stated “Strid & Keighery (2002) noted the existence of natural hybrids between the widespread H. angustifolium ... and a variety of other species ... including H. robustum.
H. angustifolium has flowers which are deep pink or white or cream, and H. robustum has pink flowers.

Visible Light: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens, Metz 15 MS-1 flash, 1/200 s @ f/16 ISO 200, Baader UV/IR Cut Filter.
Attached Image: Hypocalymma_angustifolium_x_robustum_Vis.jpg
Image Reference: DO60606

Ultraviolet Light: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens, Nissin Di866 Mark II flash, 1/200s @ f/16 ISO 200, Baader UV-Pass Filter.
Attached Image: Hypocalymma_angustifolium_x_robustum_UV.jpg
Image Reference: DO60609

Ultraviolet Induced Visible Fluorescence: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens with Baader UV/IR Cut Filter, Nichia NCSU033A UV-LED with Baader UV-Pass Filter, 30.0 s @ f/16 ISO 400.
Attached Image: Hypocalymma_angustifolium_x_robustum_UVIVFL.jpg
Image Reference: DO60615

References:
Elliott, W.R. and Jones, D.L. Encyclopaedia of Australian Plants suitable for cultivation, Volume 5, 1990, Lothian, p. 400.
Strid, A. and Keighery, G.J. A taxonomic review of the genus Hypocalymma (Myrtaceae). Nordic Journal of Botany, 2003, 22 (5).
Rye, B.L., Wilson, P.G. and Keighery, G.J., A revision of the species of Hypocalymma with smooth or colliculate seeds, Nuytsia, 2013, 23: 283-312.

Published 26 July 2015

#2 colinbm

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Posted 26 July 2015 - 05:51

Your good work continues Dave.
Col

#3 nfoto

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Posted 26 July 2015 - 09:22

Excellent documentation of this plant, Dave.

However, I wonder how a hybrid can have yellow flowers if the putative parents have flowers in cream, white, or pink?

#4 DaveO

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Posted 27 July 2015 - 03:18

That's what I wondered as well. I thought you would be interested in the Norwegian connection, the Journal is behind a pay wall so I didn't read it, only the article in Nuytsia which is open access. I think we might see what other species are available next time we visit the nursery. Does nectar always show blue fluorescence, if that's what is really visible in the centre? Does anyone know what compounds the fluorescence is due to?

Dave