A preliminary survey of the leaf-indumentum in the Australian Pomaderreae (Rhamnaceae) using Scanning Electron Microscopy
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2020
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Kellermann, J.
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Journal of the Adelaide Botanic Gardens, 2020; 33(5):75-102
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Jürgen Kellermann
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The tribe Pomaderreae (10 genera, c. 240 species) is almost endemic to Australia and defined within Rhamnaceae by the presence of ‘stellate hairs’. This paper is the first to report observations on the leaf-indumentum of 33 species of the tribe with Scanning Electron Microscopy. Apart from simple hairs and papillae, three types of stellate trichomes were observed: fasciculate hairs, appressed stellate hairs and multiradiate hairs (sessile or stalked). The existence of stellate trichomes on the examined species of Pomaderreae was confirmed. Trichomes and indumenta are often variable within genera, as the type of indumentum may be more related to its function. Some groups of species in the genera Cryptandra Sm., Pomaderris Labill. and Stenanthemum Reissek have indumentum characters that seem to be more consistent and might be of value to elucidate relationships between taxa.
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Published online: 12 June 2020
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© 2020 Board of the Botanic Gardens and State Herbarium (Adelaide, South Australia). With the exception of images and other material protected by a trademark and subject to review by the Government of South Australia at all times, the content of this publications is licensed under the Creative Commons Attribution 4.0 Licence (https://creativecommons.org/licenses/by/4.0/). All other rights are reserved.