Annals of Botany 
EDITED BY 
ISAAC BAYLEY BALFOUR, M.A., M.D., F.R.S. 
KING’S BOTANIST IN SCOTLAND, PROFESSOR OF BOTANY IN THE UNIVERSITY 
AND KEEPER OF THE ROYAL BOTANIC GARDEN, EDINBURGH 
DUKINFIELD HENRY SCOTT, M.A., LL.D., F.R.S. 
LATELY HONORARY KEEPER OF THE JODRELL LABORATORY, ROYAL BOTANIC GARDENS, KEW 
JOHN BRETLAND FARMER, D.Sc., M.A., F.R.S. 
PROFESSOR OF BOTANY, ROYAL COLLEGE OF SCIENCE, LONDON 
AND 
WILLIAM GILSON FARLOW, M.D. 
PROFESSOR OF CRYPTOGAMIC BOTANY IN HARVARD UNIVERSITY, CAMBRIDGE, MASS., U.S.A. 
ASSISTED BY OTHER BOTANISTS 
VOLUME XX 
With Thirty-five Plates, Map, and Forty-three Figures in the Text 
London 
HENRY FROWDE, M.A., AMEN CORNER, E.C. 
OXFORD: CLARENDON PRESS DEPOSITORY, 116 HIGH STREET 
1906 
