Blackstonia perfoliata

Tracheophyta MagnoliopsidaGentianaceaeBlackstoniaBlackstonia perfoliata


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.



World Distribution

Submediterranean-Subatlantic element.

© 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


Life Form - primary

Therophyte (annual land plant)



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%)


JNCC Designations


Atlas text references

Atlas (208c)
Meusel H, Jäger E, Rauschert S, Weinert E
1978.  Vergleichende Chorologie der zentraleuropäischen Flora. Volume 2. 2 vols.