Abstract
The ovary, ovule and megagamelophyte at the mature gametophyte stage have been observed for, and compared among, 131 species chosen to represent all the subgenera, sections and most of the subsections of Rhododendron.Gametophyte and early endosperm development has been followed in 14 of the species.Considerable variation occurs in ovary size, shape, indumentum, carpel number, ovule number, placental characteristics, ovule orientation, wall thickness, etc.Similarly, the ovules, though basically alike in type throughout the genus, differ in size, shape, proportion of ovule occupied by the gametophyte, thickness of integument, length of micropyle, presence of appendages, etc., while the gametophytes, which all develop according to the Polygonum pattern and have a similar complement and arrangement of cells, do differ in size, proportions, amount of starch, some cellular details, etc.Although the indumentum types on the ovary show an essentially similar distribution among subgeneric taxa as do those on the leaves, it has not been possible to discern other features, singly or in clusters, which could serve to arrange groups of species in clearly distinguishable subgeneric taxa, whether newly erected ones or those presently recognized on other grounds.Wide variation occurs in most characters among the several species observed in each of the larger sections-Vireya, Rhododendron and Hymenanihes.Although the range of variation in any one section overlaps with that in the others, each section displays, on the average, a somewhat different expression of a set of ovary and ovule characteristics.Vireya, particularly, shows a number of features which regularly occur together in most species and are found only spasmodically, and individually, in species of other sections.The several subgenera and sections of the azalea complex, each represented by many fewer examples, are even more difficult to characterize on the basis of ovary and ovule.
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Claims 12
Claim · model-written summary
Ovary size, shape and indumentum vary considerably among Rhododendron species.
- Taxon
- Rhododendron
Rhododendrone0 - Organ / stage
- ovarye1
- Outcome
- ovary size, shape, indumentume1
- Qualifier
- Considerable variatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared among, 131 species chosen to represent all the subgenera, sections and most of the subsections of Rhododendron”
e1“Considerable variation occurs in ovary size, shape, indumentum, carpel number, ovule number, placental characteristics, ovule orientation, wall thickness, etc”
Claim · model-written summary
Carpel number, ovule number and placental characteristics of the ovary vary considerably among Rhododendron species.
- Taxon
- RhododendronRhododendrone0
- Organ / stage
- ovarye1
- Outcome
- carpel number, ovule number, placental characteristicse1
- Qualifier
- Considerable variatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared among, 131 species chosen to represent all the subgenera, sections and most of the subsections of Rhododendron”
e1“Considerable variation occurs in ovary size, shape, indumentum, carpel number, ovule number, placental characteristics, ovule orientation, wall thickness, etc”
Claim · model-written summary
Ovules differ in size, shape and the proportion occupied by the gametophyte among Rhododendron species.
- Taxon
- RhododendronRhododendrone0
- Organ / stage
- ovulese3
- Outcome
- size, shape, proportion of ovule occupied by the gametophytee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared among, 131 species chosen to represent all the subgenera, sections and most of the subsections of Rhododendron”
e3“Similarly, the ovules, though basically alike in type throughout the genus, differ in size, shape, proportion of ovule occupied by the gametophyte, thickness of integument, length of micropyle, presence of appendages, etc”
Claim · model-written summary
Ovules differ in integument thickness, micropyle length and presence of appendages among Rhododendron species.
- Taxon
- RhododendronRhododendrone0
- Organ / stage
- ovulese3
- Outcome
- thickness of integument, length of micropyle, presence of appendagese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared among, 131 species chosen to represent all the subgenera, sections and most of the subsections of Rhododendron”
e3“Similarly, the ovules, though basically alike in type throughout the genus, differ in size, shape, proportion of ovule occupied by the gametophyte, thickness of integument, length of micropyle, presence of appendages, etc”
Claim · model-written summary
Gametophytes of all Rhododendron species develop according to the Polygonum pattern.
- Taxon
- RhododendronRhododendrone0
- Organ / stage
- gametophytese4
- Outcome
- develop according to the Polygonum patterne4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared among, 131 species chosen to represent all the subgenera, sections and most of the subsections of Rhododendron”
e4“the gametophytes, which all develop according to the Polygonum pattern and have a similar complement and arrangement of cells”
Claim · model-written summary
Gametophytes differ in size, proportions, starch amount and some cellular details among Rhododendron species.
- Taxon
- RhododendronRhododendrone0
- Organ / stage
- gametophytese4
- Outcome
- size, proportions, amount of starche5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared among, 131 species chosen to represent all the subgenera, sections and most of the subsections of Rhododendron”
e4“the gametophytes, which all develop according to the Polygonum pattern and have a similar complement and arrangement of cells”
e5“do differ in size, proportions, amount of starch, some cellular details, etc”
Claim · model-written summary
The distribution of ovary indumentum types among subgeneric taxa is essentially similar to that on the leaves.
- Taxon
- RhododendronRhododendrone0
- Organ / stage
- ovarye7
- Outcome
- distribution among subgeneric taxae7
- Direction
- no_changeinferrede7
- Comparator
- those on the leavese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared among, 131 species chosen to represent all the subgenera, sections and most of the subsections of Rhododendron”
e7“Although the indumentum types on the ovary show an essentially similar distribution among subgeneric taxa as do those on the leaves”
Claim · model-written summary
No other ovary or ovule features could separate Rhododendron species into clearly distinguishable subgeneric taxa.
- Taxon
- RhododendronRhododendrone0
- Outcome
- arrange groups of species in clearly distinguishable subgeneric taxae2
- Qualifier
- it has not been possible to discern other featurese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared among, 131 species chosen to represent all the subgenera, sections and most of the subsections of Rhododendron”
e2“it has not been possible to discern other features, singly or in clusters, which could serve to arrange groups of species in clearly distinguishable subgeneric taxa”
Claim · model-written summary
Vireya shows a number of ovary and ovule features that regularly occur together in most species and are found only sporadically in other sections.
- Taxon
- RhododendronRhododendrone0
- Material
- Vireyae3
- Outcome
- a number of features which regularly occur together in most speciese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared among, 131 species chosen to represent all the subgenera, sections and most of the subsections of Rhododendron”
e3“Vireya, particularly, shows a number of features which regularly occur together in most species and are found only spasmodically, and individually, in species of other sections”
Claim · model-written summary
Each section displays a somewhat different average expression of ovary and ovule characteristics.
- Taxon
- RhododendronRhododendrone0
- Material
- each sectione4
- Outcome
- expression of a set of ovary and ovule characteristicse4
- Qualifier
- somewhat differente4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared among, 131 species chosen to represent all the subgenera, sections and most of the subsections of Rhododendron”
e4“each section displays, on the average, a somewhat different expression of a set of ovary and ovule characteristics”
Claim · model-written summary
The azalea complex subgenera and sections are even more difficult to characterize on the basis of ovary and ovule.
- Taxon
- RhododendronRhododendrone0
- Material
- azalea complexe5
- Outcome
- characterize on the basis of ovary and ovulee5
- Qualifier
- even more difficulte5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared among, 131 species chosen to represent all the subgenera, sections and most of the subsections of Rhododendron”
e5“The several subgenera and sections of the azalea complex, each represented by many fewer examples, are even more difficult to characterize on the basis of ovary and ovule”
Claim · model-written summary
Most characters vary widely among the species within each of the larger sections Vireya, Rhododendron and Hymenanthes.
- Taxon
- RhododendronRhododendrone0
- Material
- larger sectionse6
- Outcome
- Wide variation occurs in most characterse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared among, 131 species chosen to represent all the subgenera, sections and most of the subsections of Rhododendron”
e6“Wide variation occurs in most characters among the several species observed in each of the larger sections-Vireya, Rhododendron and Hymenanihes”