Abstract
From a study of the grass flora of some 300 regions, a world distribution map of the grass tribe, Andropogoneae, has been prepared. This map shows that the Indo-Malaysian region is relatively rich in species of the tribe, with zones of high concentration in western India and in southern Indonesia. The relative species density falls off rapidly in passing from the tropical to the temperate zones, and is lower in the western than in the eastern hemisphere. Climatic factors are of major importance in determining the distribution pattern. Winter temperatures are of special significance in temperate regions, while there is a striking relationship between high midsummer rainfall and relative abundance of species of Andropogoneae in the tropics and subtropics. In general, the geographical survey supports conclusions drawn from taxonomic and cytological evidence regarding the origin and evolution of the tribe, but with greater emphasis on climate as a significant factor. The Andropogoneae have had a long evolutionary history in the eastern hemisphere, but have spread more recently to the western hemisphere, where they have not yet attained their full development.
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Claims 8
Claim · model-written summary
The Indo-Malaysian region is relatively rich in Andropogoneae species, with concentrations in western India and southern Indonesia.
- Taxon
- AndropogoneaeAndropogoneaet0
- Outcome
- relatively rich in species of the tribee0
- Setting
- Indo-Malaysian regione0
Verbatim
e0“the Indo-Malaysian region is relatively rich in species of the tribe, with zones of high concentration in western India and in southern Indonesia.”
t0“Andropogoneae”
Claim · model-written summary
Relative species density falls rapidly from tropical to temperate zones.
- Taxon
- AndropogoneaeAndropogoneaet0
- Outcome
- relative species densitye0
- Direction
- falls off rapidlye0
- Setting
- tropical to the temperate zonese0
Verbatim
e0“The relative species density falls off rapidly in passing from the tropical to the temperate zones”
t0“Andropogoneae”
Claim · model-written summary
Relative species density is lower in the western than the eastern hemisphere.
Verbatim
e0“is lower in the western than in the eastern hemisphere.”
t0“Andropogoneae”
Claim · model-written summary
Climate is a major factor in the distribution pattern.
- Taxon
- AndropogoneaeAndropogoneaet0
- Outcome
- distribution patterne0
- Qualifier
- Climatic factorse0
Verbatim
e0“Climatic factors are of major importance in determining the distribution pattern.”
t0“Andropogoneae”
Claim · model-written summary
Winter temperature is especially important in temperate regions.
- Taxon
- AndropogoneaeAndropogoneaet0
- Outcome
- special significancee0
- Qualifier
- Winter temperaturese0
- Setting
- temperate regionse0
Not reportedDirection
Verbatim
e0“Winter temperatures are of special significance in temperate regions”
t0“Andropogoneae”
Claim · model-written summary
High midsummer rainfall is related to relative species abundance in tropical and subtropical regions.
- Taxon
- AndropogoneaeAndropogoneaee0
- Outcome
- relative abundance of species of Andropogoneaee0
- Qualifier
- high midsummer rainfalle0
- Setting
- tropics and subtropicse0
Not reportedDirection
Verbatim
e0“there is a striking relationship between high midsummer rainfall and relative abundance of species of Andropogoneae in the tropics and subtropics.”
Claim · model-written summary
The tribe has a long evolutionary history in the eastern hemisphere.
- Taxon
- AndropogoneaeAndropogoneaee0
- Outcome
- long evolutionary historye0
- Setting
- eastern hemispheree0
Verbatim
e0“The Andropogoneae have had a long evolutionary history in the eastern hemisphere”
Claim · model-written summary
The tribe spread more recently to the western hemisphere and has not attained full development there.
- Taxon
- AndropogoneaeAndropogoneaet0
- Outcome
- spread more recentlye0
- Qualifier
- have not yet attained their full developmente0
- Setting
- western hemispheree0
Verbatim
e0“have spread more recently to the western hemisphere, where they have not yet attained their full development.”
t0“Andropogoneae”