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- W2079078199 abstract "Abstract Soliva valdiviana and Soliva pterosperma are annual species of Composites, native to South America. They were first recorded in New Zealand about 100 years ago. Soliva taxonomy relies heavily on cypsela shape, although leaf shape has also been used. The shapes of cypselas of S. valdiviana and S. pterosperma are very distinctive and quite different from each other. Collections of cypselas from Old Government House grounds, Auckland showed that, in addition to S. valdiviana and S. pterosperma, a continuum of intermediate-shaped cypselas between the two species was present. Sometimes a wide range of cypsela shapes could be collected from an area as small as 100 cm2. The variation was not due to differences in cypsela maturity, nor to packaging effects within a capitulum. There were only very minor differences in cypsela shape between capitula on the same plant and plants bred true for cypsela shape. Observations on flower and capitulum structures suggest that pollen from the central, tubular flowers which are hermaphrodite but functionally male, is transferred to the receptive stigmas of the peripheral flowers. Although the pollen tube germinates the tube does not penetrate the stigmatic surface. However, in the absence of pollen the cypsela does not develop. It appears that pollination is needed as a trigger for embryo development and that reproduction is primarily agamospermous. Outcrossing may be uncommon because the bracts enclose the peripheral flowers when they are receptive. The origin of the range of variation of cypsela shape is uncertain. Possibly it arises as a result of occasional outcrossing with predominant agamospermy." @default.
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- W2079078199 date "1986-10-01" @default.
- W2079078199 modified "2023-10-16" @default.
- W2079078199 title "Variation in cypsela morphology in<i>Soliva valdiviana</i>and<i>S. pterosperma</i>(Anthemideae, Asteraceae) in a local population at Auckland, New Zealand" @default.
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- W2079078199 doi "https://doi.org/10.1080/0028825x.1986.10409949" @default.
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