TY  - BOOK
AU  - Briggs,D.
AU  - Walters,S.M.
TI  - Plant variation and evolution
U1  - 581.15 
PY  - 1969///
CY  - London
PB  - Weidenfeld & Nicolson
KW  - Plants
KW  - Variation
KW  - Evolution
N1  - Bibliography: p. 240-252
ER  -