Nutlet morphology in Hemigenia R.Br. and Microcorys R.Br. (Lamiaceae) |
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Authors: | G. R. Guerin |
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Affiliation: | (1) Centre for Evolutionary Biology and Biodiversity, School of Earth and Environmental Sciences, University of Adelaide, S.A, Australia;(2) School of Earth and Environmental Sciences, Discipline of Environmental Biology, University of Adelaide, Benham Building (DP312), North Terrace, S.A, 5005, Australia |
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Abstract: | Nutlets of Hemigenia R.Br. and Microcorys R.Br. were examined using SEM. Significant variation, mainly useful at the infrageneric level, was found in nutlet shape, nature of the attachment scar, nature of surface sculpturing, exocarp cell shape and sculpturing, and nature of the indumentum. Typical nutlets are ovoidal, strongly reticulate or rugose. The exocarp cells are isodiametric and convex to papillate. Also common are cylindrical nutlets, often with longitudinal ridging and papillate exocarp cells. Surface pitting and concave exocarp cells are rare. A cladistic analysis of nutlet characters suggests both Hemigenia and Microcorys are polyphyletic, and Microcorys paraphyletic with respect to Westringia Sm. Notwithstanding that, the infrageneric classification of Hemigenia was largely supported, while in Microcorys, there was support for sect. Hemigenioides, but sects Anisandra and Microcorys were not resolved as distinct. |
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Keywords: | Hemigenia Microcorys Westringieae Lamiaceae nutlet SEM micromorphology cladistics |
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