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Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE

Variation in dichogamy and myophily in two dioecious Bridelia species (Phyllanthaceae)

M. A. Dias A and R. M. C. S. Ratnayake https://orcid.org/0000-0002-2794-0153 A B
+ Author Affiliations
- Author Affiliations

A Department of Plant and Molecular Biology, University of Kelaniya, Kelaniya, 11600, Sri Lanka.

B Corresponding author. Email: ratna@kln.ac.lk

Australian Journal of Botany 69(5) 301-309 https://doi.org/10.1071/BT21020
Submitted: 18 February 2021  Accepted: 14 June 2021   Published: 7 July 2021

Abstract

Duodichogamy and multi-cycle dichogamy are rare forms of temporal separation of staminate and pistillate reproductive functions in angiosperms. We studied the floral phenology, breeding system and pollination of Bridelia retusa (L.) A.Juss. and Bridelia moonii Thwaites, with a particular focus on the alternation of sexual phases to determine variation in their dichogamy. Three dichogamy patterns were identified in B. retusa, including one-cycle dichogamy (staminate → pistillate or pistillate → staminate), duodichogamy (staminate → pistillate → staminate), multi-cycle dichogamy (repeated flowering cycles alternating between staminate and pistillate) and pure staminates. Except for multi-cycle dichogamy, the other dichogamy patterns were prevalent in B. moonii. This study speculated floral mimicry system in Bridelia associated with blowflies.

Keywords: blowflies, dichogamy, sexual phases, floral phenology, staminate, pistillate, pollination, duodichogamy, blowfly, Bridelia, Phyllanthaceae.


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