Phylogenetic position of Apostasia and Neuwiedia

Authors: JUDD WALTER S STERN WILLIAM LOUIS CHEADLE VERNON I

Publish Date: 1993/10/01

Volume: 113, Issue: 2, Pages: 87-94

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Abstract

WALTER S JUDD WILLIAM LOUIS STERN VERNON I CHEADLE Phylogenetic position of Apostasia and Neuwiedia Orchidaceae Botanical Journal of the Linnean Society Volume 113 Issue 2 October 1993 Pages 87–94 https//doiorg/101111/j109583391993tb00331xCladistic analyses of the phylogenetic relationships of selected orchid taxa were conducted in order to assess the phylogenetic position of Apostasia and Neuwiedia Orchidaceae Apostasioideae These analyses employed newly available anatomical characters along with several morphological features that had been used in recent phylogenetic analyses of Orchidaceae Our analyses indicate that Apostasia is more closely related to Neuwiedia than it is to Cypripedioideae The two genera comprise an apostasiad clade this clade is the sistergroup to a clade including Cypripedioideae and monandrous orchids The apostasiad clade is diagnosed by the derived features of operculate pollen colpi Apostasiatype seeds and vessel members with simple perforation plates Of these the presence of simple perforation plates is considered to be the most significant phylogenetically Therefore the apostasiads should not be considered ancestral to the remaining orchid groups Vessel members of the monandrous orchids as well as the cypripediads are multiperforate—the hypothesized ancestral state based on the condition in Hypoxidaceae

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