Abstract
In about 10—15 % of the cases a sharp distinction between Atriplex hastata L., patula L., littoralis L., and glabriuscula Edm. is not possible, both in the field and in the herbarium. In order to establish the status of the ‘intermediates’ a karyological examination was undertaken of 95 samples collected in the Netherlands including both typical specimens and intermediates. It appeared that the specimens clearly representing A. hastata, littoralis, or glabriuscula are diploid (n = 9), but those representing A. patula tetraploid (n = 18). The ‘intermediates’ between A. hastata and patula are either diploid or tetraploid. Hence a sharp distinction between the latter two taxa is only possible on the chromosome number. A similar result was found for the ‘intermediates’ between A. patula and littoralis. It depends on the specific concept one adheres to whether these four taxa should be ranked as species; European botanists usually give them specific rank, their American colleagues infraspecific rank. Autogamy seems to be the rule in these species. This as well as the chromosome numbers found rule out the possibility of hybridization as an explanation for the occurrence of intermediates. I have strong doubts as to the artificial hybrids reported in literature because of the technical difficulties involved and apparently not solved. Special attention has been paid to possible characters to be derived from the leaves, the phyllotaxis, and the bracts. The variation in the leaves of the four species examined is overlapping. The same holds true for the phyllotaxis and the ripe fruits and fruiting bracteoles. An account is given of some abnormalities which have been found during the chromosome countings. An attempt was made to correlate morphological characters of the leaf, especially the leaf-base and leaf-index, and the chromosomes in A. hastata and patula. The results presented in the scatter diagrams show that, though on the whole there is a marked correlation between leafshape and chromosome number, no sharp distinction can be made. Finally a provisional key is given.
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Claims 7
Claim · model-written summary
Clear morphological distinction failed in about 10—15 % of cases.
- Taxon
- Atriplex hastata L.
Atriplex calothecae0 - Outcome
- a sharp distinctione0
- Value
- 10—15 %e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In about 10—15 % of the cases a sharp distinction between Atriplex hastata L., patula L., littoralis L., and glabriuscula Edm. is not possible”
Claim · model-written summary
A. hastata, littoralis and glabriuscula were diploid with n = 9.
- Taxon
- A. hastataAtriplex calothecae0
- Outcome
- diploide0
- Value
- n = 9e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. hastata, littoralis, or glabriuscula are diploid (n = 9)”
Claim · model-written summary
A. patula was tetraploid with n = 18.
- Taxon
- A. patula
Atriplex patulae0 - Outcome
- tetraploide0
- Value
- n = 18e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. patula tetraploid (n = 18)”
Claim · model-written summary
Intermediates between A. hastata and patula were diploid or tetraploid.
- Taxon
- A. hastataAtriplex calothecae0
- Outcome
- either diploid or tetraploide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ‘intermediates’ between A. hastata and patula are either diploid or tetraploid.”
Claim · model-written summary
Autogamy appeared usual in these species.
- Taxon
- Atriplex patula L.Atriplex patulat0
- Outcome
- Autogamye0
- Qualifier
- seems to be the rulee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Autogamy seems to be the rule in these species.”
t0“Atriplex patula L.”
Claim · model-written summary
Leaf, phyllotaxis, fruit and bracteole variation overlapped among species.
- Taxon
- Atriplex patula L.Atriplex patulat0
- Outcome
- variation in the leavese0
- Direction
- overlappinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The variation in the leaves of the four species examined is overlapping. The same holds true for the phyllotaxis and the ripe fruits and fruiting bracteoles.”
t0“Atriplex patula L.”
Claim · model-written summary
Leaf shape correlated with chromosome number but did not sharply distinguish taxa.
- Taxon
- A. hastataAtriplex calothecat0
- Organ / stage
- leafshapee0
- Outcome
- leafshapee0
- Qualifier
- no sharp distinction can be madee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is a marked correlation between leafshape and chromosome number, no sharp distinction can be made.”
t0“A. hastata L.”