Abstract
In this second paper on the biosystematics of the Dutch halophilous Spergularia species, the results are reported of a study of the morphological variation of S. marina by means of population samples from all parts of the Dutch area. This study was supplemented by the rearing of plants from seed samples in the experimental garden. The seeds of S. marina are usually unwinged, but some plants also produce a few broadly winged seeds and in one population plants occur whose proximal capsules contain mainly broadly winged seeds. The differences between the populations persist in cultivation and are chiefly attributable to genetic differences. Winged seeds are upon the average larger and heavier than unwinged ones and also produce larger seedlings than the latter. The relative lengths of fruiting calyx and capsule do not provide a reliable diagnostic character in respect of S. media. The number of stamens per flower varies from 0 to 10 and there are great individual differences in numbers, but in certain plants the average number is always high and in other ones always low. These differences are partly caused by heriditary factors. The growth habit and some other vegetative characters vary too widely to be of appreciable taxonomic significance.
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Claims 9
Claim · model-written summary
S. marina seeds are usually unwinged, although some plants produce broadly winged seeds.
- Taxon
- S. marina
_-_geograph.org.uk_-_215994.jpg?width=60)
Spergularia marinae0 - Organ / stage
- seedse0
- Outcome
- usually unwingede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_-_geograph.org.uk_-_215994.jpg?width=500)
Verbatim
e0“The seeds of S. marina are usually unwinged, but some plants also produce a few broadly winged seeds”
Claim · model-written summary
One population has mainly broadly winged seeds in proximal capsules.
Verbatim
e0“in one population plants occur whose proximal capsules contain mainly broadly winged seeds”
t0“MORPHOLOGICAL VARIATION OF S. MARINA”
Claim · model-written summary
Population differences persist in cultivation and are chiefly attributable to genetic differences.
Verbatim
e0“The differences between the populations persist in cultivation and are chiefly attributable to genetic differences”
t0“MORPHOLOGICAL VARIATION OF S. MARINA”
Claim · model-written summary
Winged seeds are on average larger and heavier than unwinged seeds.
Verbatim
e0“Winged seeds are upon the average larger and heavier than unwinged ones”
t0“MORPHOLOGICAL VARIATION OF S. MARINA”
Claim · model-written summary
Winged seeds produce larger seedlings than unwinged seeds.
Verbatim
e0“Winged seeds are upon the average larger and heavier than unwinged ones and also produce larger seedlings than the latter”
t0“MORPHOLOGICAL VARIATION OF S. MARINA”
Claim · model-written summary
Relative lengths of fruiting calyx and capsule are unreliable for distinguishing S. media.
Verbatim
e0“The relative lengths of fruiting calyx and capsule do not provide a reliable diagnostic character in respect of S. media”
t0“MORPHOLOGICAL VARIATION OF S. MARINA”
Claim · model-written summary
Stamen number varies from zero to ten per flower with individual differences.
Verbatim
e0“The number of stamens per flower varies from 0 to 10 and there are great individual differences in numbers”
t0“MORPHOLOGICAL VARIATION OF S. MARINA”
Claim · model-written summary
Stamen number differences are partly hereditary.
Verbatim
e0“These differences are partly caused by heriditary factors”
e1“number of stamens per flower”
t0“MORPHOLOGICAL VARIATION OF S. MARINA”
Claim · model-written summary
Growth habit and other vegetative characters vary too widely for appreciable taxonomic significance.
Verbatim
e0“The growth habit and some other vegetative characters vary too widely to be of appreciable taxonomic significance”
t0“MORPHOLOGICAL VARIATION OF S. MARINA”