Reflection of near-ultraviolet radiation from flowers of Australian native plants

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Eighty-six species of Australian native plants were assessed in the near-ultraviolet (UV-A) (320-400 nm) and visible regions of the electromagnetic spectrum. Relationships between flower colour, size, symmetry and UV-A reflection were examined. The frequency of species in this sample that reflected UV-A radiation was found to be consistent with major overseas studies. A quantitative photographic study of the spectral reflection from the yellow flower of Hibbertia obtusifolia DC. (Dilleniaceae) was conducted for radiation with wavelengths of 280-800 nm. How an insect with UV-A-, blue- and green-sensitive photoreceptors might see H. obtusifolia as a two-coloured flower, and how this could aid a floral visitor s orientation is discussed.
Original languageEnglish
Pages (from-to)473 - 488
Number of pages16
JournalAustralian Journal of Botany
Issue number4
Publication statusPublished - 1996

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