TY  - GEN
AU  - MarsdenJones Eric M
TI  - British knapweeds: a study in synthetic taxonomy 
AV  - QK495.C39  
U1  - 583.5533 
PY  - 1954///
CY  - London, 
PB  - Printed for the Ray Society; sold by B. Quaritch
KW  - Centaurea
KW  - Plants
KW  - Variation
ER  -