The nectary spur is a characteristic feature of Aeridinae; a large, orchid subtribe displaying diverse pollination strategies. Stpiczyńska et al. describe and compare its anatomy for a range of entomophilous and ornithophilous species. Structural nectary features shared by Asiatic Ascocentrum and certain bird-pollinated, Neotropical orchids assigned to Maxillariinae, Laeliinae and Oncidiinae are indicative of convergence.
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Plants have evolved the ability to germinate in salty soils multiple times, in a case of convergent evolution
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Fossils of Eocene palm trees near the Arctic Circle reveal a heated past
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Longer cones and a clockwise spiral lead to tighter seed packing in a Jurassic conifer
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