Blackstonia perfoliata
Tracheophyta
›Magnoliopsida›Gentianaceae›Blackstonia›Blackstonia perfoliata
Ecology
An annual or biennial herb of open dry (but frequently winter-wet), often stony, shallow basic soils. Its main habitats are calcareous grasslands and fixed sand dunes, but it can be an abundant colonist of disturbed ground, including quarries and railway cuttings, and on road verges and pathsides. Lowland.
Status
Native
Trends
There has been little change in the overall distribution of this species since the 1962 Atlas, although it has spread into Northumberland since then (Swan, 1993).
World Distribution
Submediterranean-Subatlantic element.
© P. Shannon
Cherry, vc29
© P. Shannon
Cherry, vc29
© P. Shannon
Therfield, vc20
© P. Shannon
Therfield, vc20
© P. Shannon
Therfield, vc20
© P. Shannon
Broad Habitats
Calcareous grassland (includes lowland and montane types)
Light (Ellenberg): 8
Moisture (Ellenberg): 5
Reaction (Ellenberg): 8
Nitrogen (Ellenberg): 2
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 4
July Mean Temperature (Celsius): 15.8
Annual Precipitation (mm): 812
Height (cm): 45
Perennation - primary
Annual
Life Form - primary
Therophyte (annual land plant)
Woodiness
Herbaceous
Clonality - primary
Little or no vegetative spread
Count of 10km squares in Great Britain: 787
Count of 10km squares in Ireland: 198
Count of 10km squares in the Channel Isles: 2
Atlas Change Index: 0.12
Weighted Changed Factor: 5
Weighted Change Factor Confidence (90%)
33
JNCC Designations
NHMSYS0000456502
Atlas text references
Atlas (208c)
.
1978. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 2. 2 vols.