Journal article

OPERCULUM DEVELOPMENT IN THE EUDESMIEAE-B EUCALYPTS AND EUCALYPTUS-CAESIA (MYRTACEAE)

AN DRINNAN, PY LADIGES

Plant Systematics and Evolution | SPRINGER-VERLAG WIEN | Published : 1989

Abstract

In theEudesmieae B eucalypts and inEucalyptus caesia, the perianth of the mature flower consists of a single, anatomically continuous, opercular structure that is crowned by the tips of the original free and separate calycine and corolline whorls. Ontogenetic and comparative evidence supports the hypothesis that this operculum is mostly corolline in composition, and that the calycine parts have been elevated distally onto the dorsal surface. In theEudesmieae B eucalypts this condition appears to be due to precocious initiation of the corolline primordia, followed by expansion and continuity of their growth centres which incorporates the areas at or below the base of the still differentiating..

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