Abstract
As a first step towards a broader floral ontogenetic study on Cornales, the flowers of four species of Hydrangeaceae (Deutzia corymbosa, Kirengeshoma palmata, Philadelphus purpurascens and Hydrangea petiolaris) were studied. In Deutzia and Kirengeshoma five sepal primordia are generally initiated, in Philadelphus only four. Sepal initiation in Kirengeshoma shows a tendency to tetramony. Deutzia has a variable sepal initiation. Petal growth was never retarded in the studied species. Initiation of the androecium in Kirengeshoma, Philadelphus and Hydrangea starts with antesepalous primary primordia, on which secondary primordia are soon formed, leading ultimately to the formation of polystaminate androecia. In Deutzia a diplostemonous androecium is formed, starting with the initiation of the antesepalous stamen primordia. Gynoecium development is similar in all species studied: on a concave floral apex, a ring meristem is initiated; it develops into a variable number of continuous carpel primordia, while the centripetally growing common margins form the septa. Initiation of the ovule primordia starts halfway up each placenta and extends in an apical, basal and lateral direction. A number of morphological problems are discussed, such as the derivation of tetramery, and evolutionary and developmental trends in the androecium and gynoecium. Kirengeshoma is well settled in Hydrangeaceae, although its exact position within the family remains uncertain. A sistergroup relationship of Hydrangeaceae with Loasaceae is supported. However, Hydrangeaceae also share features with Saxifragaceae (e.g. similar gynoecium development).
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Claims 12
Claim · model-written summary
Deutzia and Kirengeshoma generally initiate five sepal primordia.
- Taxon
- Deutzia and Kirengeshoma
Deutzia
Kirengeshomae0 - Outcome
- five sepal primordiae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Deutzia and Kirengeshoma five sepal primordia are generally initiated”
Claim · model-written summary
Philadelphus initiates four sepal primordia.
- Taxon
- Philadelphus
Philadelphuse0 - Outcome
- only foure0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Philadelphus only four”
t0“Philadelphus purpurascens”
Claim · model-written summary
Sepal initiation in Kirengeshoma tends toward tetramony.
- Taxon
- KirengeshomaKirengeshomae0
- Outcome
- tendency to tetramonye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sepal initiation in Kirengeshoma shows a tendency to tetramony”
Claim · model-written summary
Deutzia has variable sepal initiation.
- Outcome
- variable sepal initiatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Deutzia has a variable sepal initiation”
Claim · model-written summary
Petal growth was not retarded in the four studied species.
- Taxon
- HydrangeaceaeHydrangeaceaet0
- Outcome
- Petal growth was never retardede0
Verbatim
e0“Petal growth was never retarded in the studied species”
t0“Hydrangeaceae”
Claim · model-written summary
Kirengeshoma, Philadelphus and Hydrangea form polystaminate androecia from antesepalous primary primordia and secondary primordia.
- Taxon
- Kirengeshoma, Philadelphus and Hydrangea
HydrangeaPhiladelphusKirengeshomae0 - Outcome
- formation of polystaminate androeciae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Initiation of the androecium in Kirengeshoma, Philadelphus and Hydrangea starts with antesepalous primary primordia, on which secondary primordia are soon formed, leading ultimately to the formation of polystaminate androecia”
Claim · model-written summary
Deutzia forms a diplostemonous androecium beginning with antesepalous stamen primordia.
- Outcome
- diplostemonous androecium is formede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Deutzia a diplostemonous androecium is formed, starting with the initiation of the antesepalous stamen primordia”
Claim · model-written summary
The studied species have similar gynoecium development through a ring meristem and continuous carpel primordia.
- Taxon
- HydrangeaceaeHydrangeaceaet0
- Outcome
- Gynoecium development is similare0
Verbatim
e0“Gynoecium development is similar in all species studied: on a concave floral apex, a ring meristem is initiated; it develops into a variable number of continuous carpel primordia, while the centripetally growing common margins form the septa”
t0“Hydrangeaceae”
Claim · model-written summary
Ovule primordia initiate halfway up each placenta and extend apically, basally and laterally.
- Taxon
- HydrangeaceaeHydrangeaceaet0
- Outcome
- Initiation of the ovule primordia starts halfway up each placentae0
Verbatim
e0“Initiation of the ovule primordia starts halfway up each placenta and extends in an apical, basal and lateral direction”
t0“Hydrangeaceae”
Claim · model-written summary
Kirengeshoma is placed in Hydrangeaceae, although its precise position is uncertain.
- Taxon
- KirengeshomaKirengeshomae0
- Outcome
- well settled in Hydrangeaceaee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kirengeshoma is well settled in Hydrangeaceae, although its exact position within the family remains uncertain”
Claim · model-written summary
The findings support a sister group relationship between Hydrangeaceae and Loasaceae.
- Taxon
- HydrangeaceaeHydrangeaceaee0
- Outcome
- sistergroup relationship of Hydrangeaceae with Loasaceaee0
Verbatim
e0“A sistergroup relationship of Hydrangeaceae with Loasaceae is supported”
Claim · model-written summary
Hydrangeaceae also shares features with Saxifragaceae, including gynoecium development.
- Taxon
- HydrangeaceaeHydrangeaceaee0
- Outcome
- share features with Saxifragaceaee0
Verbatim
e0“Hydrangeaceae also share features with Saxifragaceae (e.g. similar gynoecium development)”