Abstract
The early floral development of Stylidium adnatum and Stylidium graminifolium is characterized by an initial circular primordium whose areas in the transversal plane of the floral primordium show enhanced growth. The spiral inception of the five sepals starts before the differentiation of the initial circular primordium into two stamen primordia in transversal position (in relation to the floral diagram) and the corolla ring primordium below the stamen primordia. Then five petal primordia, which alternate with the sepals, arise on the corolla ring primordium (early sympetaly). Peculiar to the flowers of Stylidiaceae is the column that bears at its top both stigma and anthers. Probably this column should be interpreted as a receptacular tube. No distinct carpel primordia have been observed. The inferior ovary results from intercalary growth in the peripheral parts of the receptacle below the calyx, corolla, and stamen primordia. The residual floral apex gives rise to a transversal septum, by which the ovary becomes bilocular. None of the morphological, palynological, and embryological characters discussed contradicts a position of the Stylidiaceae near the Campanulales, and several of these characters support this position. Key words: Stylidiaceae, Campanulales, floral development, systematic position, floral biology.
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Claims 9
Claim · model-written summary
Early floral development begins with a circular primordium showing enhanced transverse growth.
- Taxon
- Stylidium adnatum and Stylidium graminifolium
Stylidium graminifolium
Stylidium adnatume0 - Organ / stage
- floral primordiume0
- Outcome
- enhanced growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The early floral development of Stylidium adnatum and Stylidium graminifolium is characterized by an initial circular primordium whose areas in the transversal plane of the floral primordium show enhanced growth.”
Claim · model-written summary
Spiral sepal inception precedes differentiation of two stamen primordia and the corolla ring.
Not reportedTaxon
Verbatim
e0“The spiral inception of the five sepals starts before the differentiation of the initial circular primordium into two stamen primordia in transversal position (in relation to the floral diagram) and the corolla ring primordium below the stamen primordia.”
Claim · model-written summary
Five alternating petal primordia arise on the corolla ring.
Not reportedTaxon
Verbatim
e0“Then five petal primordia, which alternate with the sepals, arise on the corolla ring primordium (early sympetaly).”
Claim · model-written summary
Stylidiaceae flowers have a column bearing both stigma and anthers.
- Taxon
- StylidiaceaeStylidiaceaee0
- Organ / stage
- flowerse0
- Outcome
- column that bears at its top both stigma and antherse0
Verbatim
e0“Peculiar to the flowers of Stylidiaceae is the column that bears at its top both stigma and anthers.”
Claim · model-written summary
The floral column is probably a receptacular tube.
Not reportedTaxon
Verbatim
e0“Probably this column should be interpreted as a receptacular tube.”
Claim · model-written summary
Distinct carpel primordia were not seen.
Not reportedTaxon
Verbatim
e0“No distinct carpel primordia have been observed.”
Claim · model-written summary
The inferior ovary develops by intercalary receptacle growth.
Not reportedTaxon
Verbatim
e0“The inferior ovary results from intercalary growth in the peripheral parts of the receptacle below the calyx, corolla, and stamen primordia.”
Claim · model-written summary
A transverse septum from the residual floral apex makes the ovary bilocular.
Not reportedTaxon
Verbatim
e0“The residual floral apex gives rise to a transversal septum, by which the ovary becomes bilocular.”
Claim · model-written summary
Discussed characters support placement of Stylidiaceae near Campanulales.
- Taxon
- StylidiaceaeStylidiaceaee0
- Outcome
- support this positione0
- Qualifier
- near the Campanulalese0
Verbatim
e0“None of the morphological, palynological, and embryological characters discussed contradicts a position of the Stylidiaceae near the Campanulales, and several of these characters support this position.”