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April 1984
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40 Reads
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26 Citations
Aquatic Botany
A general account of the genus Ottelia (Hydrocharitaceae) is presented including a full description, a diagnosis and a synonymy with information on floral biology, anatomy, morphology and embryology. A key for the identification of all the species is also presented.
... The relatively recent self-establishment of O. ovalifolia in New Zealand (McCullough, 1997) suggests that the species can disperse long distances and is capable of colonising isolated freshwater bodies opportunistically. Furthermore, O. ovalifolia is cleistogamous in the deeper rock-holes and generally only produces open flowers when the water is shallow (usually at draw-down when the rock-holes are nearly dry; a feature seen in several members of the genus), with an estimated 90-95% of O. ovalifolia seeds the result of cleistogamous self-pollination (Cook et al., 1984;Ernst-Schwarzenbach, 1956). These flexible reproductive strategies are possibly an adaptation for the establishment and persistence of O. ovalifolia in ephemeral waterbodies from arid and semi-arid regions, where populations are small, widely separated, and where pollinators may be limiting. ...
April 1984
Aquatic Botany
