Abstract
Xyridaceae, Eriocaulaceae, and Mayacaceae form the xyrid clade, which is weakly supported in Poales. The floral anatomy of xyrid species was studied, to contribute to the understanding of the relationships within the group. Both Eriocaulaceae and Xyridaceae have petals with elongated epidermal cells with straight walls, epipetalous stamens, staminodes, anthers with longitudinal dehiscence, an endothecium with band-like thickenings, and a style vascularized by the dorsal carpellary bundles; these characteristics thus corroborate the close relationship of these groups indicated by phylogenetic analyses. Mayacaceae is distinguished by the presence of papillose epidermal cells in the petals, a reduced inner whorl of stamens, poricidal anthers, an endothecium lacking thickenings, a style and stigma vascularized by the dorsal and ventral carpellary bundles, and the presence of an obturator in the ovary wall. A reduction in the inner whorl of fertile stamens also occurs in Juncaceae and Cyperaceae, linking Mayacaceae to the cyperids. The stylar appendages of Orectanthe (Xyridaceae) have been shown to be nectariferous and anatomically similar to those of Abolboda, differentiating these two genera from Xyris (Xyridoideae) and confirming their placement in Abolbodoideae. Stylar appendages also occur in Eriocaulaceae, with the same function, position, and vascularization, and are therefore homologous structures, reinforcing the phylogenetic proximity between Eriocaulaceae and Xyridaceae.
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Claims 6
Claim · model-written summary
Eriocaulaceae and Xyridaceae share a set of floral anatomical characters supporting a close relationship.
- Taxon
- EriocaulaceaeEriocaulaceaee0
- Outcome
- close relationshipe0
Verbatim
e0“Both Eriocaulaceae and Xyridaceae have petals with elongated epidermal cells with straight walls, epipetalous stamens, staminodes, anthers with longitudinal dehiscence, an endothecium with band-like thickenings, and a style vascularized by the dorsal carpellary bundles; these characteristics thus corroborate the close relationship of these groups indicated by phylogenetic analyses”
Claim · model-written summary
Mayacaceae has distinctive petal, stamen, anther, style and ovary traits.
- Taxon
- MayacaceaeMayacaceaee0
- Outcome
- papillose epidermal cells in the petalse0
Verbatim
e0“Mayacaceae is distinguished by the presence of papillose epidermal cells in the petals, a reduced inner whorl of stamens, poricidal anthers, an endothecium lacking thickenings, a style and stigma vascularized by the dorsal and ventral carpellary bundles, and the presence of an obturator in the ovary wall”
Claim · model-written summary
Reduction of the inner fertile stamen whorl also occurs in Juncaceae and Cyperaceae, linking Mayacaceae to cyperids.
- Outcome
- reduction in the inner whorl of fertile stamense0
Verbatim
e0“A reduction in the inner whorl of fertile stamens also occurs in Juncaceae and Cyperaceae, linking Mayacaceae to the cyperids”
Claim · model-written summary
Orectanthe stylar appendages are nectariferous and anatomically similar to those of Abolboda.
- Taxon
- Orectanthe
Orectanthee0 - Outcome
- nectariferous and anatomically similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The stylar appendages of Orectanthe (Xyridaceae) have been shown to be nectariferous and anatomically similar to those of Abolboda”
Claim · model-written summary
Those appendages distinguish Orectanthe and Abolboda from Xyris and support their placement in Abolbodoideae.
- Outcome
- placement in Abolbodoideaee0
.jpg?width=60){kind=small}
XyrisOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“differentiating these two genera from Xyris (Xyridoideae) and confirming their placement in Abolbodoideae”
Claim · model-written summary
Eriocaulaceae stylar appendages are homologous to those of Xyridaceae and reinforce phylogenetic proximity.
- Taxon
- EriocaulaceaeEriocaulaceaee0
- Outcome
- homologous structurese0
Verbatim
e0“Stylar appendages also occur in Eriocaulaceae, with the same function, position, and vascularization, and are therefore homologous structures, reinforcing the phylogenetic proximity between Eriocaulaceae and Xyridaceae”