COMPARATIVE REPRODUCTIVE-BIOLOGY OF 2 SUN-ORCHIDS - THE VULNERABLE THELYMITRA-CIRCUMSEPTA AND THE WIDESPREAD T-IXIOIDES (ORCHIDACEAE)

Authors
SYDES MA CALDER DM
Citation
Ma. Sydes et Dm. Calder, COMPARATIVE REPRODUCTIVE-BIOLOGY OF 2 SUN-ORCHIDS - THE VULNERABLE THELYMITRA-CIRCUMSEPTA AND THE WIDESPREAD T-IXIOIDES (ORCHIDACEAE), Australian Journal of Botany, 41(4-5), 1993, pp. 577-589
Citations number
28
Categorie Soggetti
Plant Sciences
Journal title
Australian Journal of Botany → ACNP
ISSN journal
00671924
Volume
41
Issue
4-5
Year of publication
1993
Pages
577 - 589
Database
ISI
SICI code
0067-1924(1993)41:4-5<577:CRO2S->2.0.ZU;2-T
Abstract
Two morphologically similar Sun-orchid species, Thelymitra ixioides Sw . and T. circumsepta Fitzg. were studied with respect to their reprodu ctive ecology. Breeding systems were found to contrast strongly. In th is study the widespread, T. ixioides is insect pollinated and encourag es xenogamy by relying on native Lasioglossum and Exoneura bees for po llination. In contrast, the vulnerable and restricted T. circumsepta w as found to autopollinate. These two species differ in floral display and reproductive efficiency. These breeding systems are discussed in r elation to the life histories of the two species.