2000New Zealand Journal of BotanyOpen access

Dioecism in Elingamita johnsonii (Myrsinaceae)

Peter B. Heenan

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Abstract

Abstract Examination of the flowers of Elingamita johnsonii confirms that the species is functionally dioecious. Female flowers have a well‐developed ovary, capitate stigma, and anthers which produce pollen with occluded apertures. Male flowers produce abundant aperturate pollen and have a rudimentary ovary that lacks a normally developed stigma and placenta. The sizes of the floral parts differ in each sex, with the female having smaller sepals, petals, and anthers, and shorter filaments. Male plants have lager inflorescences, more flowers per inflorescence, and more pollen grains per anther.

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Abstract Examination of the flowers of Elingamita johnsonii confirms that the species is functionally dioecious. Female flowers have a well‐developed ovary, capitate stigma, and anthers which produce pollen with occluded apertures. Male flowers produce abundant aperturate pollen and have a rudimentary ovary that lacks a normally developed stigma and placenta. The sizes of the floral parts differ in each sex, with the female having smaller sepals, petals, and anthers, and shorter filaments. Male plants have lager inflorescences, more flowers per inflorescence, and more pollen grains per anther.

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Available abstract

Abstract Examination of the flowers of Elingamita johnsonii confirms that the species is functionally dioecious. Female flowers have a well‐developed ovary, capitate stigma, and anthers which produce pollen with occluded apertures. Male flowers produce abundant aperturate pollen and have a rudimentary ovary that lacks a normally developed stigma and placenta. The sizes of the floral parts differ in each sex, with the female having smaller sepals, petals, and anthers, and shorter filaments. Male plants have lager inflorescences, more flowers per inflorescence, and more pollen grains per anther.

Key concepts: Sepal, Pollen, Stamen, Petal, Inflorescence, Biology, Ovary, Botany

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