Plant Systematics and Evolution

, Volume 160, Issue 3–4, pp 219–239

Perianth development inAngophora and the bloodwood Eucalypts (Myrtaceae)

  • Andrew N. Drinnan
  • Pauline Y. Ladiges
Article

Abstract

The petals ofAngophora flowers are compound structures consisting of two morphologically distinct components that develop along separate morphogenetic pathways. These two components are also evident in the corolline parts of the bloodwood eucalypts. In occasional flowers ofAngophora and some bloodwoods, several adjacent corolline primordia may become continuous due to interprimordial growth, but the petals are mostly free at anthesis. In other bloodwood eucalypt species all the primordia in the corolline whorl become continuous at some stage in development, resulting in an operculum that is anatomically unresolvable into its original petaline parts. The varying degrees of this continuity that are evident within individual trees (and even within single flowers) suggests that operculum formation is an epigenetic event that is determined by morphogenetic processes within the flower. It is suggested that these may relate to differing rates of growth in different regions of the bud.

Key words

Angiosperms Angophora Eucalyptus bloodwoods Floral morphology perianth development operculum growth centres continuity 

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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • Andrew N. Drinnan
    • 1
  • Pauline Y. Ladiges
    • 1
  1. 1.School of BotanyUniversity of MelbourneParkvilleAustralia

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